Research on knock simulation of dual fuel engine based on two-zone model

Since natural gas is different from the combustion characteristics of diesel and gasoline, gas engines are more likely to knock during operation. This paper aims to establish a relationship model between the knock phenomenon of dual-fuel engines and the operation management parameters, analyze the influence of different operation parameters on the knock phenomenon. The Wärtsilä 6L34DF dual-fuel engine simulation model is established using the two-zone combustion model, the frame data is used for model calibration, and the knock integral model and the knock intensity index (KI) model are combined as indicators for knock phenomenon simulation to analyze the influence of the intake temperature, compression ratio, jet timing and other parameters on engine knock. The results show that the combination of the knock integral model and the KI model can effectively simulate the performance and knock trend of the engine. Engine knock can be avoided by controlling the intake temperature below 338K, the compression ratio not exceeding 14 or the injection timing control at -12.5° ATDC.