前　言 从1950年以来,发展了一些描写压缩机、气阀和工作流体的简单的数学模型。通常,这种数学分析应满足两个涉及许多参数的非线性微分方程式,即描述流经气阀时流体压力降与质量流量以及阀片开启度间关系的流动方程式,即得用曲柄转角函数表示流过气阀时的压差和阀片位移关系,随后即可画出普通的P-V图。 Preface Since 1950, a number of simple mathematical models have been developed that describe compressors, valves and working fluids. In general, this mathematical analysis should satisfy two nonlinear differential equations involving many parameters, namely the flow equation describing the relationship between the fluid pressure drop and the mass flow rate and the degree of opening of the valve as it flows through the gas valve, which is expressed by the crank angle function Flow through the valve when the pressure difference and valve displacement relationship, then you can draw a normal PV map.