600 — Hydrogen combustion¶
This chapter explores hydrogen as an aviation fuel from a combustion, thermodynamics, and system-level perspective.
Rather than treating hydrogen as a simple “drop-in replacement”, the exercises in this chapter highlight how hydrogen fundamentally alters:
- combustion temperatures and equilibrium composition,
- engine cycle performance,
- aircraft range and sizing,
- onboard storage thermodynamics.
The goal is to understand what changes, why it changes, and where the real constraints lie.
Exercises in this chapter¶
600.1 — Adiabatic flame temperature: H₂ vs kerosene¶
Equilibrium and simplified (“main products only”) calculations to compare flame temperatures and composition.
600.2 — Aircraft range with alternative fuels (Breguet analysis)¶
Baseline and alternative-fuel range predictions using the Breguet equation.
600.3 — Turbofan performance: hydrogen vs kerosene¶
Comparison of turbofan cycle performance using different fuels.
600.4 — Turbofan design trade-offs (Pareto / multi-objective)¶
Multi-objective exploration of turbofan design space for H₂ vs kerosene.
600.5 — Hydrogen tank thermodynamics¶
Time evolution of hydrogen tank state variables under realistic operating assumptions.
Learning outcomes¶
After completing this chapter, you should be able to:
- Explain why hydrogen combustion leads to different flame temperatures and product distributions
- Distinguish combustion advantages from system-level penalties
- Use simplified range and engine cycle models to compare fuels consistently
- Understand why storage, not combustion, is often the dominant constraint for hydrogen aircraft
- Critically assess claims about “hydrogen-powered aviation”
This chapter provides the technical basis for later discussions on feasibility, safety, and system integration.