为进一步研究斯特林循环内回热器换热过程对系统性能的影响，建立气缸的等温换热过程模型，以容积为1 L、初始压力为500 kPa的理想气体为工质，计算分析了循环内工质经等容回热过程对系统内参数和各部件的影响。结果表明，在工质从303 K等容吸热升温至973 K的过程中，系统压力升高，压缩腔内工质密度从5.75 g/m3增加至18.5 g/m3，膨胀腔内工质密度从1.75 g/m3增加至5.75 g/m3，压缩腔与膨胀腔需对外释放的热量分别为364和824 J;回热器在工质等容吸热前后的换热量为工质的焓差，而不是工质的内能差。

In order to study the influence of heat exchange process of regenerator in Stirling cycle on system performance,the isothermal heat transfer process model of cylinder was established.Taking the ideal gas with the volume of 1 L and initial pressure of 500 kPa as the working medium,the effects of the cycled working medium in isovolumetric regenerative process on the parameters and components of the system were calculated and analyzed.The results show that system pressure increases when the working medium is heated from 303 K to 973 K in the isovolumetric endothermic process.The densities of working medium in compression chamber and expansion chamber increase from 5.75 g/m3 and 1.75 g/m3 to 18.5 g/m3 and 5.75 g/m3 respectively,which cause the heat released from the compression chamber and expansion chamber to be 364 J and 824 J respectively.Before and after the isovolumetric endothermic process,the quantity of heat exchange in regenerator is enthalpy difference of working medium rather than internal energy difference.

TK221

上海市市级科技重大专项资助课题（2017SHZDZX02）；PLS-IVO30真空内波荡器项目（1105000503）