In order to improve the thermal efficiency

detonation and operating range of spark ignition engines fueled with aviation kerosene

a single-cylinder

water-cooled

4 stroke

variable compression ratio engine with high pressure common rail and in-cylinder direct injection was used to test the combustion characteristics of using kerosene/ethanol blend fuel under different load

ethanol/kerosene blending ratio

injection pressure and injection timing conditions. Results show that under the condition of injection pressure of 7

the engine load can only reach 72% of the original engine load due to the limitation of detonation. Ethanol has a higher ability to suppress detonation. With the increase of ethanol content in the blend fuel

the engine operating range expands continuously. When the ethanol/kerosene blending ratio is 10%

the engine can be operated at full load. On this basis

continuing increase in ethanol content can further increase engine power

and reduce fuel consumption. In order to explore the influence of fuel injection timing on engine power and fuel economy

the effect of five injection timings on combustion performance was tested. As observed

the engine has better power with an injection timing of 300° before top dead center

and higher economy with an injection timing of 360° before top dead center.