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建立了活塞激光热负荷数值模拟模型,研究了不同冷却介质对活塞热负荷的影响。结果表明,激光卸载过程活塞顶和通油孔通气冷却,温度波动发生在活塞顶薄层区域,与活塞在实际稳定工况下的温度响应一致;激光卸载过程活塞内腔和通油孔通气或通油孔通水冷却,温度波动区域都不能反应在实际稳定工况下的状态。低周热疲劳采用激光卸载过程配合活塞顶通气、活塞内腔和通油孔通水能缩短试验周期、加速活塞的热疲劳损伤。数值模拟与试验结果基本吻合,验证了模型的有效性。
The numerical simulation model of piston laser thermal load was established, and the influence of different cooling medium on piston thermal load was studied. The results show that the piston top and the through hole are ventilated and cooled during laser unloading, and the temperature fluctuation occurs in the top layer of the piston, which is consistent with the temperature response of the piston under the actual steady conditions. The piston lumen and the oil passage are ventilated during the laser unloading process or Through hole through the water cooling, temperature fluctuations in the region can not respond to the actual state of steady conditions. Low-cycle thermal fatigue using laser unloading process with the top of the piston ventilation, piston cavity and through the oil hole can shorten the test period, accelerate the thermal fatigue damage piston. The numerical simulation is in good agreement with the experimental results, which verifies the validity of the model.