郎肯循环中滑片式膨胀机基本方程的研究

Research on Basic Equations of Rankine-cycle Sliding Plate Expander

现有的用于分析膨胀机输出功率的焓降方程和等熵膨胀做功方程均不能反映试验中实测到的与转速相关的非线性特征。本文利用朗肯循环中的输出功率方程证明了常用的膨胀机特征方程缺少反映非线性特征的分量;通过引入膨胀机内部泄漏流量,建立了与实测的朗肯循环中滑片式膨胀机转矩-转速曲线和功率-转速曲线特征完全一致的数学模型,为分析朗肯循环特性提供了理论依据。

The existing enthalpy drop equation and the isentropic expansion work equation for analyzing the output power of the expander cannot reflect the measured nonlinear characteristics related to the speed in the test. In this paper, the output power equation in the Rankine-cycle is used to prove that the commonly used expander characteristic equation lacks the component that reflects the nonlinear characteristic. By introducing the internal leakage flow of the expander, the mathematical model with the same characteristics of torque-speed curve and power-speed curve of the vane expander in the measured Rankine cycle is established, which provides a theoretical basis for analyzing the characteristics of the Rankine cycle.