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一、热力学方法简介所谓热力学方法,就是根据热力学第一定律,通过测定流体的热力学参数,从而确定流体机械效率的方法。现以水泵为例来说明这种方法的基本原理。在热力学方法中,水泵的效率定义为理想的等熵压缩条件(将水由入口状态等嫡压缩到出口压力状态)下水泵进出口焓差与水泵实际工作时进出口焓差之比,即η=等熵压缩时进出口焓差/实际工作时进出口焓差=h_3-h_1/h_2-h_1
First, the introduction of thermodynamic method The so-called thermodynamic method, is based on the first law of thermodynamics, by measuring the thermodynamic parameters of the fluid to determine the fluid mechanical efficiency. The pump is an example to illustrate the basic principles of this method. In the thermodynamic method, the efficiency of the pump is defined as the ideal isentropic compression condition (water from the inlet state 嫡 compressed to the outlet pressure state) under the pump inlet and outlet enthalpy difference and the actual pump inlet and outlet enthalpy ratio, η = Enthalpy difference between inlet and outlet when isentropic compression / enthalpy difference between inlet and outlet when working = h_3-h_1 / h_2-h_1