Abstract
Alternative jet fuel is designed to be fit for purpose and interchangeable with conventional jet fuel, so that no modification to the engine or fuel distribution system is needed. To achieve full certification, the fuel candidate must undergo rigorous test programs, which include component or rig tests and engine tests to ensure the combustion performance is comparable with that of conventional fossil jet fuel. This is necessary in view of the differences in fuel chemistry for fuels produced from different processing pathways. This chapter covers the test programs that are conducted to evaluate the combustion performance of alternative jet fuel as part of the certification process required. Part of the test program requires the assessment of the fuel impact on the fuel supply system, component tests, and effect on the turbine hot section. Full engine test is conducted next to assess the performance from the system level at realistic flight conditions. Studies of the fundamental combustion properties complement the component test to enable better understanding of the fuel chemistry effects. The fundamental flame properties are important to facilitate the development of surrogate jet fuel models that are widely utilized in combustion modeling for the design of advanced aero engine and prediction of engine performance.
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