摘要
建立了存在传热损失、摩擦损失和工质变比热时的不可逆普适往复式循环模型,用有限时间热力学理论和方法分析其性能。由数值计算给出功率与压比、效率与压比以及功率与效率的特性关系,并分析了摩擦损失、工质变比热和多变指数对循环性能的影响。所得结果包含了内可逆和不可逆Otto循环和Diesel循环的结果,但又有一定的拓展。
The performance of an irreversible universal reciprocating cycle with heat transfer loss,friction loss and variable specific heats of working fluid is analyzed by using finite-time thermodynamic theory and method.The universal relations between the power output and the compression ratio,between the thermal efficiency and the compression ratio,as well as between the power output and the thermal efficiency of the cycle are derived by numerical examples.Moreover,the effects of the friction loss,the polytropic exponent and the variable specific heats of working fluid on the performance of cycle are analyzed.The results obtained herein include the performance characteristics of endoreversible and irreversible Otto and Diesel engines,and can be extended in some degrees.
出处
《节能》
2015年第6期15-21,2,共7页
Energy Conservation
基金
国家自然科学基金(项目编号:10905093)
关键词
有限时间热力学
普适模型
多变指数
finite-time thermodynamics
universal cycle
polytropic exponent
