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一、超音速气流工况叶栅压力比的确定涡轮机在运行中,流量往往与设计工况不同,为了分析在变工况时机组的经济性与安全性,需要知辺叶栅的压力比。通常为了较准确地解决这一问题,需要对机组逐级进行详细计算,即采用试估焓降的方法,利用连续方程与能量方程进行校核,工作量颇大,本文利用查图和计算相结合的方法,能较方便地决定动叶栅的压力比。
First, the supersonic airflow conditions to determine the pressure ratio of the cascade Turbine in operation, the flow is often different from the design conditions, in order to analyze the economic conditions and safety of the crew in variable conditions, you need to know the pressure ratio of the cascade. Usually in order to solve this problem more accurately, it is necessary to calculate the unit level by level, that is to say, using the method of estimating the enthalpy drop and using the continuous equation and the energy equation for checking, the workload is quite large. In this paper, Combination of methods, can more easily determine the pressure ratio of moving cascade.