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Aiming at the thermal load problem of the four-stroke high-speed diesel  engine piston, a piston thermal fluid-solid coupling model based on the  combustion thermal boundary and the two-phase flow oscillation cooling  thermal boundary is established. The model considers the problem that the  piston can’t fill the cooling cavity due to the reciprocating motion. The  effects of different engine speeds and the injection speed on the filling  rate are studied. The variation curves of the filling rate of the oil in the  cooling cavity are simulated, and the transient heat transfer coefficient  and temperature of each crank angle are obtained. The average value is then  analyzed by heat flow-solid coupling, and the influence of the filling rate  of the piston cavity on the temperature field of the piston is obtained.  Through the comparison of the experimental results of the hardness plug  measurement method, the calculation of the model is accurate and can be well  used for the simulation of the piston temperature field and the evaluation  of the thermal load at the critical position. Based on this model, the  regularity analysis of the influencing factors of the piston thermal load is  carried out. The influencing factors include the filling rate of the cavity,  the air-fuel ratio, the injection timing, etc., and finally the engine  operating range that meets the heat load requirements is obtained.

Thermal load analysis and control of four-stroke high speed diesel engine