Combustion Optical Instrumentation PhD: Flame Dynamics and Droplet Ignition

Combustion Optical Instrumentation PhD: Flame Dynamics and Droplet Ignition

Assessment: A well-funded, interdisciplinary instrumentation project with a clear application context; the exact measurement programme, facility allocation and 2027/28 award terms need confirmation.

Quick assessment

This 3.5-year EPSRC Doctoral Landscape Award (DLA) project at the University of Sheffield proposes new optical and optoelectronic instruments for examining how gaseous and liquid fuels combust. The advertised doctoral work spans instrument and electronics design, measurement-system characterisation, flame dynamics and stability, ignition of individual droplets, and signal processing. It is likely to suit applicants from electronic or mechanical engineering, physics or a related area who want to work across optical sensing and combustion. The project description asks for relevant electronics-design skills or a willingness to develop them; it does not state a minimum degree class.

The Sheffield listing advertises full tuition, a UKRI-rate stipend (with £21,805 as the 2026/27 reference), and a research grant for 3.5 years. That stipend is a 2026/27 reference, not a confirmed rate for an October 2027 start. The dedicated DLA form closes 13 January 2027 at 17:00 GMT (the application page says 5pm UK time) and asks for a 1 October 2027 start. International candidates may apply, but EPSRC caps international awards at 30%; Sheffield considers Home-fee candidates in the first selection phase. One saved record anticipates up to ten awards without specifying the scope, while another refers to up to ten international awards; confirm the quota. Project listing, 2027/28 DLA opportunities, DLA application instructions.

The project has a credible scientific and technical rationale: non-contact optical measurements can capture fast changes in high-temperature environments, while the two named supervisors bring relevant instrumentation and combustion expertise. The main open questions are which measurement approach will be selected, how it will be calibrated and evaluated, which fuel/flame/droplet cases are in scope, and what facilities and test time are specifically allocated. The project page says the student will use bespoke instrumentation and experimental combustion facilities, but public group descriptions do not establish access to every listed university facility. A useful next step is to contact the supervisors before applying and ask about those points and the expected evidence of preparation.

Research problem and doctoral work

Combustion systems for future aviation and other energy uses need to be assessed as fuel compositions change. Different fuels can produce different flame behaviour, stability and ignition characteristics. Optical sensing offers a way to observe rapidly changing combustion without placing a contact probe directly in the hottest region. UK policy also creates an active context for sustainable aviation fuel: the Sustainable Aviation Fuel Mandate started at 2% of UK jet-fuel demand in 2025 and is set to rise to 10% by 2030 and 22% by 2040. Those policy targets explain why fuel research is relevant; they do not establish that any particular fuel is sustainable across its lifecycle or that this project will improve aviation emissions. UK Sustainable Aviation Fuel Mandate.

The advertised work has four connected strands:

1. Design and characterise optoelectronic measurement systems. The student will develop new optical instrumentation for combustion measurements and assess its measurement characteristics.
2. Build supporting electronics and acquisition. The project includes bespoke electronics for collecting and processing measurement data.
3. Apply measurements to combustion questions. The stated targets include gaseous and liquid fuels, flame dynamics and stability, and the ignition behaviour of individual fuel droplets. Future aviation is a particular application context.
4. Interpret measured signals. The project includes advanced signal processing and data analysis to extract information from the instrument output.

Infrared radiation thermometry, multi-channel photodetection and other optical approaches are named as possibilities, not fixed methods. The specific fuel set, combustion apparatus, comparison conditions, data-acquisition architecture and research work-package sequence are not published. Similarly, “sustainable fuels” is the motivation and application setting; no named fuel, emissions target, lifecycle assessment or claimed performance improvement is specified. The expected work is therefore best understood as developing and testing measurement capability against combustion questions, with the final instrument choices to be agreed through the research.

As an analytical framework, a convincing study would make the chain from instrument response to combustion interpretation visible: what physical quantity is measured, what reference measurement supports it, how repeatability and uncertainty are assessed, and how signal features relate to flame or droplet behaviour. This framework is a suggestion for evaluating the research plan, not a published protocol or promised project milestone. The advert does not set accuracy thresholds, comparison baselines, sample sizes, or target outputs. Those details will determine whether a new method provides information beyond existing optical and thermal approaches.

The project description confirms bespoke instrumentation and experimental combustion facilities. Sheffield's group-level pages add useful context: the Thermofluids group researches alternative fuels, combustion and flame stability, while the Energy Innovation Centre describes university-wide energy and combustion resources. These are background indicators, not proof that a particular facility, burner, detector or test slot is assigned to this doctorate. Thermofluids group, Energy Innovation Centre facilities.

School, discipline and doctoral training

The University of Sheffield is the degree-awarding institution; its official address is in Sheffield, UK. The project is advertised in the School of Electrical and Electronic Engineering (EEE), within the Microelectronic and Semiconductor Systems (MISS) group. Prof Yang Zhang's profile is hosted by Mechanical, Aerospace and Civil Engineering (MAC), giving the project a cross-school supervisory setting. No external employer, joint-degree partner, second registering university or split-site arrangement is named. The DLA listing gives a 3.5-year award and a 1 October 2027 start. University-wide PhD guidance describes supervised original research; the Doctoral Development Programme provides general research, writing, careers, ethics and professional-development training. The specific project training calendar and registration details beyond the stated award duration are not published. University contact and location, Routes to a PhD, Doctoral Development Programme, new PGR information, Research Degree Code of Practice 2025–26.

Sheffield's Faculty of Engineering reports that 96% of its REF 2021 submission was rated world-leading or internationally excellent and that the submission ranked eighth for research quality. The submission covers six engineering departments and is faculty-level context, not an EEE-specific rating or an assessment of this project. REF 2021 Engineering results.

The current EEE research-degree English-language table gives IELTS 6.5 overall with at least 6.0 in each component, or an accepted equivalent. This is a general school-level requirement and should be checked for the 2027 DLA entry. The project advert lists relevant academic backgrounds but no grade threshold; do not treat the general English requirement as a substitute for checking the candidate's specific academic eligibility. EEE English-language requirements.

Supervisors, research environment and recent work

Dr Matthew Hobbs' official profile describes expertise in infrared radiation thermometry, thermal imaging, fibre-optic measurement instrumentation, hyperspectral imaging, optical metrology and sensor/electronics development. Prof Yang Zhang's profile focuses on combustion and energy, flame dynamics and advanced flow diagnostics. The pairing suggests complementary supervision in instrument development and combustion application. The project listing does not describe their respective supervisory roles, meeting arrangements, or whether other researchers will formally co-supervise. Matthew Hobbs profile, Yang Zhang profile.

MISS's published work includes infrared radiation thermometry, thermal and hyperspectral imaging, and luminescence-based sensing. It also lists industrial collaborators including Rolls-Royce, CERATIZIT and PyrOptik Instruments. This is group-level history: the project notice does not name any of those organisations as a partner, funder, data provider or guaranteed placement for this specific studentship. Likewise, the Semiconductor Materials and Devices group page and Energy Innovation Centre facilities describe university capabilities, not a committed equipment allocation to this project. Ask which staff, optical systems, experimental chambers, detectors and support budgets the student will actually be able to use. Semiconductor Materials and Devices group, Energy Innovation Centre facilities.

Four recent Sheffield-linked studies help clarify the nearby research landscape:

• Lai et al. (2025), “A novel method for spectral and spatial characterisation of flames using a custom-developed hyperspectral imaging system.” The study uses radiometrically calibrated hyperspectral imaging to map radiant power across methane-air flames in spectral and spatial dimensions and addresses non-uniformity in optical and electronic components. It illustrates why calibration and instrument correction matter. It is a methane-air study and does not demonstrate measurement performance for the advertised sustainable-fuel project. Fuel article.
• Karapateas et al. (2025), “InAsSb photodiode-based infrared radiation thermometer for the investigation of droplet surface temperature dynamics within an enclosed combustion chamber.” The authors report non-contact measurement of a kerosene droplet's surface temperature during early combustion, with a stated ±2 °C measurement uncertainty and 500 μs acquisition time. This is closely related to the advertised droplet-ignition theme and gives a concrete baseline to discuss with the supervisors: what new instrument question or combustion regime would the PhD address beyond existing work? The paper's performance is not a promised target for this project. Sensors article.
• Karapateas et al. (2024), “Si APD-based high speed infrared radiation thermometry for analysing the temperature instability of a combustion chamber.” This paper describes a non-contact infrared thermometer based on a silicon avalanche photodiode and reports 1 μs data acquisition. It offers context for temporal measurement of combustion instability, but the PhD listing does not specify that detector or acquisition rate. Sensors article.
• Lai et al. (2024), “Advanced visualisation of biomass charcoal combustion dynamics using MWIR hyperspectral and LWIR thermal imaging under varied airflow conditions.” The study combines mid-wave infrared hyperspectral imaging with long-wave thermal imaging to analyse biomass-charcoal combustion under varied airflow. It is adjacent evidence for combining optical bands and imaging, but concerns solid biomass rather than the gaseous and liquid fuel targets named in this project. Fuel article.

These papers indicate active work around combustion metrology and optical interpretation; they also make project differentiation an important question. The advertised doctorate could extend, combine or adapt these capabilities, but public information does not specify whether it will use hyperspectral imaging, photodetectors, infrared thermometry, or a new alternative. Nor do the papers establish that a project output, paper or particular fuel result is guaranteed.

Funding, application and Sheffield costs

The 2027/28 opportunity listing advertises 3.5 years, full tuition, a project research grant and a UKRI-rate stipend, with £21,805 per year as the 2026/27 reference. UKRI lists £21,805 as the minimum full-time stipend from October 2026 and £5,238 as its minimum Home-fee contribution for 2026/27. These figures are 2026/27 benchmarks; the applicable stipend and fees for October 2027 should be checked in the award documentation. The project page does not break down the research grant, equipment consumables, conference/travel allowance or any other discretionary budget. DLA project and funding listing, UKRI student support, UKRI-funded studentships.

Sheffield's 2026/27 EEE postgraduate-research fee lookup lists Home fees of £5,238–£10,238 and Overseas fees of £30,790–£35,790, with possible research-support enhancements. These are dated fee references, not the future invoice for this specific award. The DLA application page states that EPSRC funds fees only to the Home level and Sheffield will cover the difference for successful international awardees. International applicants remain subject to the 30% EPSRC cap; Sheffield considers Home applicants first. One saved record gives up to ten awards without specifying the scope, while another refers to up to ten international awards; confirm the quota with Sheffield. Worldwide eligibility therefore does not mean an uncapped or equal-fee-status competition. Sheffield PGR fee lookup, DLA international application rules.

For 2026/27, Sheffield lists postgraduate accommodation examples from £151.41 per week for a shared-bathroom room to £240.38 per week for a studio; many postgraduate contracts last 51 weeks. A university guide separately estimates rent at £500–£800 per month and groceries at £30–£45 per week. These are planning figures, not a full budget, and will likely be revised before the 2027/28 academic year. The Student visa maintenance amount is set by GOV.UK and should be checked against the application-date rule for study outside London. It is an immigration funds threshold rather than a realistic full-year budget; visa and immigration-health-surcharge costs are separate, and UKRI says its student support does not cover them. Accommodation rents, international student cost guidance, GOV.UK Student visa financial evidence.

Applications must use the dedicated EPSRC DLA form; a standard PhD application or an application to another scheme is not eligible for this competition. The form includes three questions on motivation/suitability, relevant knowledge and skills, and an example of investigating a research question, each limited to 300 words. Applicants are strongly encouraged to contact supervisors, can select up to two relevant projects, and should select 1 October 2027 as the start date. The form asks applicants to disclose and explain any AI use in the application process. It closes at 5pm UK time on Wednesday 13 January 2027; in January this is GMT, consistent with the project listing's 17:00 GMT wording. DLA application instructions.

Applicant preparation and career context

The project specifically welcomes backgrounds in Electronic Engineering, Mechanical Engineering, Physics or a closely related discipline. It says applicants should have or want to develop electronics-design skills related to optical instrumentation and/or combustion characterisation. This describes the advertised profile; no project-specific minimum degree class, prior publication or years of experience are stated. The DLA assesses research potential alongside prior academic attainment and uses common core competencies. The school currently requires IELTS 6.5 overall with no component below 6.0, or accepted equivalent, for EEE research degrees.

Preparation that follows from the stated work could include a concise example of electronics or optical measurement, instrumentation/data acquisition, experimental design, signal processing, combustion or thermal science, and a research question the applicant has worked through. Applicants do not need to claim expertise in every area; showing how one relevant strength transfers to cross-disciplinary work is more credible than presenting every candidate method as a prerequisite. These are suggested preparation points, not additional admission rules. A supervisor conversation could clarify what the first-year design and measurement priorities are and whether the project is looking for stronger electronics, optics, combustion or analysis experience.

The project could support pathways in optical and electronic instrumentation, photonics, sensor development, thermal/combustion diagnostics, aerospace and energy R&D, measurement engineering, and applied or academic research. Sheffield's Doctoral Development Programme and careers support provide general training context. Skills England's 2026 report identifies electrical and electronics engineering among priority occupations in several sectors; this is broad national labour-market evidence, not a forecast of jobs, salary or placement for this PhD. Skills England 2026 report.

Next actions and questions to verify

Before applying

• Confirm the dedicated DLA form, 1 October 2027 start date and any required supporting documents. Ask whether the supervisors expect any degree-class threshold beyond the published background profile.
• Contact both supervisors about how the optical instrumentation and combustion strands fit together and whether the project remains open for selection.
• If applying internationally, check the DLA's current selection stages and Home/International fee treatment; international places are capped and Home applicants are considered first.

At interview

• Which research questions and fuel cases are prioritised, and which of infrared thermometry, multi-channel photodetection, imaging or another modality is likely to be developed?
• What reference measurements and evaluation criteria will establish instrument calibration, uncertainty, repeatability and usefulness for the selected flame or droplet question?
• What combustion facilities, optical instruments, detectors, electronics support and training are available specifically to this student, and what costs sit within the project research grant?
• How are Dr Hobbs and Prof Zhang expected to divide supervision? Will a named industry collaborator contribute to the doctorate, or do the listed group relationships apply only to broader MISS activities?
• Are any work-package schedule, planned outputs or fuel-specific milestones available beyond the public project summary?

Before accepting an offer

• Confirm the 3.5-year registration and award dates, 2027/28 stipend, tuition coverage for the applicant's fee status, research grant scope, consumables and travel support in writing.
• Ask whether there are project-specific registration, progression, safety or training requirements not described in the DLA application guidance.
• International applicants should confirm the fee difference, CAS timing, visa/IHS costs and award conditions. Budget using current rent and grocery guidance, then update it when 2027/28 figures are published.

Evidence and Sources

Project, DLA and university context

• EEE PhD opportunities and project description
• 2027/28 EPSRC DLA project and funding opportunities
• DLA application form, deadline and international rules
• EPSRC DLA scheme overview
• University address and location
• Routes to a PhD
• Doctoral Development Programme
• Information for new PGRs
• Research Degree Code of Practice 2025–26
• EEE research-degree English-language requirements
• REF 2021 Engineering results

Supervisors, research groups and facilities

• Dr Matthew Hobbs profile
• Prof Yang Zhang profile
• Thermofluids research group
• Energy Innovation Centre facilities
• Semiconductor Materials and Devices group

Recent publications and field context

• Lai et al. (2025), hyperspectral flame characterisation
• Karapateas et al. (2025), infrared thermometry for droplet surface temperature
• Karapateas et al. (2024), high-speed Si APD infrared thermometry
• Lai et al. (2024), infrared imaging of biomass-charcoal combustion
• UK Sustainable Aviation Fuel Mandate

Funding, costs and careers

• Sheffield postgraduate research fees
• UKRI support for funded students
• UKRI-funded studentships
• Sheffield accommodation rents 2026/27
• Sheffield international-student cost guidance
• GOV.UK Student visa financial requirements
• Skills England annual skills report 2026