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建立了排气过程的数学模型，并用测试的Ｐ－θ图对数学模型做了验证，在此基础上分析了排气过程中的过压缩问题。
The mathematic model of the exhaust process is established, and the mathematical model of the exhaust is validated by the test P-θ diagram. On this basis, the over-compression problem in exhaust process is analyzed.