Aviation Climate PhD: How New Fuels Could Change Contrail Formation

Aviation Climate PhD: How New Fuels Could Change Contrail Formation

Research checked 6 November 2026.

Decision summary

This is a strong, fully funded doctoral opportunity at Imperial for applicants interested in aerosol and ice microphysics, fuel-property modelling and aviation's non-CO₂ climate effects. Its distinctive contribution is a proposed bridge from molecular-scale fuel and particle processes through population-balance modelling to global contrail simulations. The named supervisors span several parts of that chain. The main feasibility question is whether the broad cross-scale plan can be staged into a tractable 3.5-year thesis. Public materials do not yet specify the fuel cases, input data, coupling interfaces, validation targets or compute allocation. The cohort page lists a 4 January 2027 deadline, full tuition coverage and a £23,805 annual tax-free stipend; confirm the final application documents and overseas-fee terms before committing substantial application effort. BI0006 project page October 2027 cohort

Research question and likely doctoral work

Aviation climate impact includes both carbon dioxide and non-CO₂ effects. Contrails can persist in suitable cold, humid air, but their formation and climate forcing depend on fuel and engine emissions, ambient conditions, particle activation, ice growth and subsequent cloud evolution. This project asks whether changes in fuel composition and emissions could change contrail formation enough to reduce aviation's contrail climate impact. This is a hypothesis to test; the project page does not promise that any fuel will eliminate contrails. BI0006 project page ContrailMIP roadmap

The project page specifies linked tasks: investigate ice-formation mechanisms for conventional jet fuel, SAF, hydrogen and metal-hydride/kerosene slurries; use molecular dynamics and population-balance methods; quantify effects of fuel composition, sulfur and particulate emissions on aerosol microphysics and ice nucleation; reduce uncertainty in the links between fuel properties, particles and contrails; then incorporate findings into global-scale contrail models for future aviation scenarios. In practice, this suggests a modelling thesis that moves from fuel and particle representations to plume or contrail microphysics and then to global implications. The page does not specify fuel datasets, model interfaces, uncertainty propagation, measurement work, validation criteria or a target reduction in contrail forcing. It does not list fuel synthesis, engine development, lifecycle greenhouse-gas accounting or operational flight testing as doctoral tasks. BI0006 project page

University, department and doctoral environment

The project is offered through Imperial's Doctoral Programme in Sustainable Aviation (DPSA), with Aeronautics identified as the primary affiliation for institute-funded students and a secondary affiliation elsewhere at Imperial. The 2027 cohort is organized around cross-disciplinary aviation sustainability and offers shared learning, short courses, progress reviews, a first-year group project, seminars and an annual showcase. This is substantive cohort activity, though the public page does not give BI0006's exact training calendar, secondary-affiliation obligations or registration and upgrade milestones. Imperial's Aeronautics department describes a wider research-degree environment across aerospace, energy and environmental topics. The formal course named for the application is Aeronautics Research (PhD); confirm the department and degree-registration route for this specific award. DPSA programme Aeronautics PhD study Doctoral application process October 2027 cohort

A useful historical institutional signal is Imperial's REF 2021 Engineering Unit of Assessment output profile: 64.2% of outputs were rated 4-star and 34.4% 3-star. This is a unit-level assessment from 2021, not a current league-table position and not an evaluation of BI0006 or its supervisors. Read it alongside the more decision-relevant evidence: cohort structure, named staff, recent publications and research resources. Imperial REF 2021 Engineering outputs

Supervisors, teams and research resources

Stelios Rigopoulos is the named primary supervisor. His Imperial profile describes work in molecular modelling, computational fluid dynamics, population balances, aerosols and net-zero fuels, and links to CPMOD, an open-source population-balance code. This aligns closely with the project's molecular-to-particle component. The public code is evidence of method capacity, not a guarantee that BI0006 will use it or that a particular compute allocation is reserved. Rigopoulos profile CPMOD repository

Sebastian Eastham is an Associate Professor in Sustainable Aviation and leads the Aerospace Environmental Impacts Simulation group. His public work connects aircraft-plume and atmospheric modelling, including APCEMM and GEOS-Chem, with observations and aviation impacts. Marc Stettler is Professor of Transport and Environment and leads the Transport & Environment Laboratory, with work spanning transport emissions, aerosol science and sustainable aviation. Their complementary profiles fit the proposed path from emissions and particle processes to global climate analysis. Public group pages and facilities describe wider Imperial capability; they do not confirm project-specific access, code support or a physical fuel/contrail measurement campaign. The three supervisors' exact division of responsibility and meeting cadence are not stated. Eastham profile AEIS group Stettler profile Aeronautics facilities

Recent research that frames the project

• A 2025 contrail microphysics study extends particle-activation modelling to volatile plume particles. It highlights uncertainty in particle properties and sensitivity of ice activation to fuel, aircraft and ambient conditions; it is methodological context, not a result for hydrogen or slurry fuels. Volatile plume-particle activation model
• The ECLIF3 flight study compared 100% HEFA-SPK with Jet A-1 under specific aircraft and flight conditions. It reported 56% fewer ice particles and 35% fewer soot particles in the tested case. This supports studying fuel composition but cannot be generalized to all SAF, hydrogen or other engines. 100% SAF flight study
• A 2024 expansion-chamber study found that tested lubrication-oil droplets can activate and freeze. This cautions against treating soot as the only possible ice-forming particle source; it is not a test of BI0006 fuels. Lubrication-oil droplets
• A 2026 paper reports substantial contrail formation at low soot emission levels in a lean-burn-engine setting, emphasizing the need for data beyond simple soot-to-ice extrapolations. Its aircraft and engine context differs from the advertised fuel cases. Low-soot contrail formation
• Ground-camera comparisons with reanalysis and CoCiP over 281 flights found mismatches in predicted formation and geometric width; the sample was limited to five clear-sky days and young contrails. This is a reminder that global-model inputs need evaluation, not proof of any fuel effect. Ground-based contrail model comparison
• A 2025 CocipGrid paper describes a model designed for flight-planning and air-traffic-management applications; a 2024 satellite/deep-learning paper estimates contrail altitude using GOES-16 and CALIOP data; and a 2024 global analysis estimates aviation contrail effects using reanalysis, engine emissions and flight trajectories. Together they show active modelling and observation work across scales, with outputs dependent on assumptions and inputs. CocipGrid model Satellite contrail-altitude estimation Global contrail effects, 2019–2021

A 2026 roadmap for a contrail model intercomparison project describes disagreements among 0D, 2D and 3D models, observational gaps and uncertainty in physical parameterizations. That makes uncertainty propagation and transparent validation central design questions for BI0006: molecular or population-balance results should not be treated as decisive global climate evidence without documenting how assumptions pass between model scales. ContrailMIP roadmap

Field outlook and possible research value

The field is moving from broad claims about cleaner fuels toward process-specific questions: which fuel properties change particle emissions, which particles activate as ice, how sulfur and volatile material affect nucleation, and how local changes translate into persistent contrails and climate forcing. BI0006 is relevant because it targets that chain and proposes fuel cases beyond the best-studied SAF comparisons. It may produce useful parameterizations or evidence for future aviation scenarios, but the public project page does not promise a particular climate benefit. The UK SAF mandate provides policy context for increasing sustainable-fuel supply, while UK government work on contrail mitigation also considers non-fuel measures. These policies explain relevance; they are not BI0006 deliverables. UK SAF mandate Jet Zero contrail mitigation report

Likely transferable role families include atmospheric or aerosol modelling, aviation climate analysis, research software and scientific computing, fuel-emissions research, and aviation sustainability policy. These are inferred from the skills and subject matter, not advertised placements or guaranteed outcomes. Skills England's advanced-manufacturing outlook is broad and scenario-dependent; it is not a forecast for contrail scientists. Imperial's PhD career service offers workshops and employer-facing support, but does not establish BI0006 graduate placement rates. Skills England advanced-manufacturing assessment Imperial PhD career support

Funding, London costs and application terms

The October 2027 cohort page lists a 3.5-year award, full coverage of tuition fees, an annual tax-free stipend of £23,805 and a generous but unquantified travel budget. It explicitly accepts Home and international applicants. The travel amount, eligible uses, payment schedule and stipend indexation are not stated. International eligibility does not by itself resolve whether the award covers the full overseas tuition rate for every year; obtain that in writing. UKRI publishes a London-weighted stipend comparator at the same nominal amount, but the project page does not identify the award as UKRI-funded. October 2027 cohort UKRI support for funded students

Imperial's 2026 living-cost guide gives a 12-month total of £22,722, based on college-run accommodation plus food, travel and personal/leisure costs. Subtracting this from the stated stipend leaves £1,083 before 2027 price changes; that simple difference is not disposable income and will vary with housing, lifestyle and travel. The estimate excludes tuition, study materials, flights and insurance; Imperial notes that some new international students may need up to £1,500 for start-up costs. UK visa rules currently require £1,529 per month for up to nine months for study in London, held for the specified evidence period; this is a visa proof-of-funds threshold, not a realistic annual budget. Recheck the figures for 2027. Imperial London living costs Student visa money requirement

The cohort page states a 4 January 2027 deadline, 1 October 2027 start and 3.5-year duration. It asks applicants to apply to Aeronautics Research (PhD), use Brahmal Institute as the group and include project code BI0006. Instead of a research proposal, it requests a one-page A4 letter answering two questions, each with a 200-word maximum: steps taken and planned to become a sustainability leader, and why the applicant's background fits DPSA. However, the same page's FAQ also says a personal statement is required, while also saying no proposal is needed. It gives an apparent stale target for final decisions (“early March, 2026”) despite recruiting for October 2027. Confirm whether a separate personal statement is required and ask for the current decision timeline. Imperial's general doctoral application guidance says applications are submitted online and normally include two referees; the cohort's project-specific instructions should govern the extra letter and deadline. October 2027 cohort Doctoral application process BI0006 project page

Applicant fit and preparation

Formal criteria. Applicants should have, or expect to obtain, a first-class honours Master's degree or higher in aerospace engineering or an allied field such as computational engineering, mechanical engineering, mathematics or physics. The cohort also names strong numerical methods and scientific computing, creative problem-solving, independent organization under deadlines, technical writing and communication, and a demonstrated interest in sustainability. It accepts Home and international applicants. The page does not specify grade equivalencies for international degrees or a separate English-language threshold for this project. October 2027 cohort

Helpful preparation, not stated prerequisites. A strong application can make quantitative work legible: a reproducible code or modelling project, a clear validation strategy, and evidence of explaining uncertainty. Familiarity with aerosols, ice nucleation, molecular simulation, population balances or global atmospheric models would help the transition, but the project page does not list each as an entry requirement. Applicants mainly seeking wet-lab research, engine design, fuel production or policy analysis may find the advertised work narrower and more computational than expected; those activities are not specified as core tasks. Rigopoulos profile Eastham profile BI0006 project page

Questions to resolve

Before applying

• Is the one-page, two-answer letter the only additional narrative document, or is a separate personal statement also required? What is the current decision timetable?
• What time and time zone apply to the 4 January 2027 deadline? How are international Master's classifications assessed?
• Does full tuition coverage cover the full overseas rate for all 3.5 years, including annual increases? What is the travel budget, and what does it cover?

At interview

• Which fuel cases are core, and which are stretch goals? How will molecular dynamics and population-balance outputs couple to plume and global contrail models?
• Which fuel/emission, meteorological and observational datasets are already available? What calibration, validation and uncertainty-propagation criteria define a successful result?
• Is any measurement campaign planned, or is the thesis computational? What compute, code support and supervision cadence are committed, and how are the three supervisors' roles divided?
• What are the planned stages and a credible first-year deliverable within the 3.5-year duration?

Before accepting

• Obtain the fee coverage, stipend schedule/indexation, travel terms and any visa, Immigration Health Surcharge or relocation support in writing.
• Confirm registration, progression reviews, cohort duties and the exact research scope for the offer.

Evidence and Sources

Project, programme and university

• BI0006 project page
• October 2027 cohort: deadline, eligibility, funding and FAQ
• Imperial doctoral application process
• PhD study in Aeronautics
• Doctoral Programme in Sustainable Aviation
• REF 2021 Engineering output profile

Supervisors and resources

• Stelios Rigopoulos profile
• Sebastian Eastham profile
• Marc Stettler profile
• Aerospace Environmental Impacts Simulation group
• CPMOD population-balance code
• Aeronautics research facilities

Field evidence and policy

• ContrailMIP roadmap
• Volatile plume-particle activation model (2025)
• Low-soot contrail formation study (2026)
• 100% SAF flight study (2024)
• Lubrication-oil ice-formation study (2024)
• Ground-based contrail observations and model comparison (2025)
• CocipGrid model (2025)
• Satellite contrail-altitude estimation (2024)
• Global aviation contrail climate effects, 2019–2021
• UK Sustainable Aviation Fuel Mandate
• Jet Zero contrail impact mitigation report (2025)

Funding, costs and career context

• Imperial London living-cost guide (2026)
• UK Student visa financial requirement
• UKRI support for funded doctoral students
• Skills England advanced-manufacturing assessment (2026)
• Imperial PhD career support