线性唯象传热定律下广义不可逆卡诺热机的频率特性  

Frequency Characteristics of a Generalized Irreversible Carnot Heat Engine Under a Linear Phenomenological Heat Transfer Law

作　　者：刘晓威[1] 陈林根[1] 孙丰瑞[1] 

机构地区：[1]海军工程大学研究生院,湖北武汉430033

出　　处：《热能动力工程》2009年第6期730-736,共7页Journal of Engineering for Thermal Energy and Power

基　　金：教育部新世纪优秀人才支持计划基金资助项目(NCET-04-1006);全国优秀博士学位论文作者专项基金资助项目(200136)

摘　　要：以广义不可逆卡诺热机模型为研究对象,考虑工质与热源间传热服从线性唯象定律,研究热机性能与循环频率的关系。得到了不同于内可逆情况下的输出功率、效率以及可利用温差与循环频率和吸、放热时间比的关系式,通过数值计算,分析了热漏、内不可逆性的影响特点。结果表明,在任一循环吸、放热时间比下,存在一个最佳循环频率,使循环输出功率达到最大;存在热漏时,任一循环吸、放热时间比下,存在一个最佳循环频率,使循环效率达到最大。With a generalized irreversible Carnot heat engine serving as an object of study and the heat transfer between the working medium and the heat source being considered as observing the linear phenomenological heat transfer law,studied was the relationship of the heat engine performance and its cycle frequency.Obtained was the relationship among the output power,efficiency,available temperature difference as well as the ratio of heat absorption and release time under the condition different from an internally reversible Carnot heat engine.Through a numerical calculation,an analysis was conducted of the characteristics influencing the heat leakage and internally irreversible properties.It has been found that at any ratio of the cyclic heat absorption and release time,there exists an optimum cyclic frequency for the engine that can maximize its output power.When there is a heat leakage,at any ratio of the cyclic heat absorption and release time,there exists an optimum cyclic frequency,resulting in a maximal cyclic efficiency.

关 键 词：有限时间热力学 不可逆热机 循环频率 线性唯象传热定律 频率特性 

分 类 号：TK123[动力工程及工程热物理—工程热物理]