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| Experimental Study on the Optimization of Combustion Performance of a High-Pressure Direct Injection SI Engine Fueled with Aviation Kerosene Blended with Ethanol |
| DOI：10.13949/j.cnki.nrjgc.2020.02.005 |
| Key Words:aviation kerosene ethanol compression ratio high pressure injection knock |
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| Abstract: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. |
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