Effect of key parameters on knock of two-stroke kerosene engine
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摘要: 针对二冲程汽油发动机改用航空煤油后的爆震抑制和性能恢复进行了研究，利用GT-Power软件建立发动机的一维仿真模型并对煤油发动机的爆震进行了预测和优化。仿真结果表明：推迟点火时刻、远低于和远大于理论空燃比的混合气对爆震都有一定的抑制作用，试验结果验证了仿真结果的正确性。提出并采用协同推迟点火和增加喷油的控制策略进行试验研究。试验结果表明：在低转速大负荷工况下，爆震可被有效抑制，节气门全开时功率恢复在90%以上。发动机转速为5 500 r/min时，功率恢复能达到原机的95.7%。Abstract: Focusing on the performance recovery and knock suppression of two-stroke gasoline engine after switching to aviation kerosene，a one-dimensional simulation model of kerosene engine was established by GT-power，and the knock of kerosene engine was predicted and optimized.The simulation results showed that delaying the ignition time，the mixture far below and far greater than the theoretical air-fuel ratio can yield a certain inhibitory effect on knock.The experimental results verified the correctness of the simulation results.The control strategy of collaborative delaying ignition and increasing fuel injection was proposed and used for experimental researches.The results showed that the knock can be effectively suppressed at low speed and heavy load，the power recovery was generally more than 90% when the throttle was fully open.When the engine speed was 5 500 r/min，the power recovery can even reach 95.7% of the original engine.
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