气动汽车动力系统分析

应用热力学理论和分析方法，对气动汽车动力系统各主要环节在工作过程中能量损失情况进行了研究，结果表明，由于节流、泄漏和高压尾气排放等原因，在高压减压阀和气动发动机两个环节存在损失.运用平衡方程对相关环节中的损失进行计算,建立了系统的分析数学模型，并针对一气动汽车动力系统实例，应用该模型仿真计算得到了系统的流图，图示结果表明，最终做功输出的不到总有用能量的1/3，尾气排放、节流减压和泄漏等原因引起的损失分别达43.2%、18.3%和7.8%，对系统整体效率有较大的影响.

Exergy analysis on power system of air-powered vehicle

Applying the thermodynamics theory and exergy analysis method, the power loss in the working process of the power system of air-powered vehicle was studied. The results of the analysis showed that exergy loss mainly exists in the high pressure decompression valve and air powered engine, which results from throttle, leakage, high pressure tail-gas exhausting, etc. The equations for exergy loss calculation were obtained according to exergy balance equation and the exergy analysis model of the system was built up, based on the study. Using this model, a case of power system of air powered vehicle was simulated and accordingly, an exergy flow graph was obtained. The graph indicated that the exergy transferred into mechanical output at last was less than 1/3 of the total energy. The exergy loss in tail-gas exhausting, high pressure decompression and air leakage were 43.2%, 18.3% and 7.8G, respectively. Those factors greatly affect the efficiency of the system.