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采用大涡模拟方法研究了介质温度和工作压强对模拟燃烧室中压强振荡的影响,旨在获得相同发动机结构条件下,冷流实验和发动机热试车之间压强振荡的联系,探索采用冷流实验方法研究实际发动机流动稳定性的可能性。研究结果表明对于相同结构的发动机,冷热流之间存在很大程度的一致性,全尺寸发动机的实验数据和数值模拟结果也给予了验证,介质温度决定了压强振荡的频率,工作压强决定了振荡的振幅。
The effect of medium temperature and working pressure on the pressure oscillation in a simulated combustion chamber was studied by using a large eddy simulation method. The aim was to obtain the relationship between the pressure oscillation of the cold flow test and the engine hot test under the same engine structural conditions. Method to study the possibility of actual engine flow stability. The results show that for the same engine structure, there is a large degree of consistency between the cooling flow and the cooling flow. The experimental data and numerical simulation results of a full-size engine are validated. The medium temperature determines the frequency of pressure oscillation. Oscillation amplitude.