一、前言 斯特林回热器同一般贮能式回热器相比有如下特征:(1)冷、热吹风周期与流体质点通过回热器所需时间同量级,因此切换过程中残留气体对换热影响很大;(2)冷、热流体的人口参数远非定常,压力、温度、质量流量等参数随时间周期变化;(3)斯特林回热器中流体状态不仅取决于回热器本身,还受发动机工质压缩、膨胀的影响。文献[1、2、3]主要考虑了压力、质量流量的变化,用边界条件反映发动机对回热器的影响,没有考虑切换过程和压缩、膨胀的影响。本文在充分考虑了上述三个特点的基础上建立了回热器模型,并提出用α_0、β_0、γ_0三个无量纲数来反映发动机对回热器的影响。 I. Introduction Stirling regenerator compared with the general energy storage regenerator has the following characteristics: (1) cold and hot air circulation period and the fluid particle through the regenerator the same amount of time, so the process of switching residue (2) the population parameters of cold and hot fluid are far from constant, and the parameters such as pressure, temperature and mass flow change with time; (3) The state of fluid in Stirling regenerator depends not only on Regenerator itself, but also by the engine working fluid compression, expansion of the impact. The literature [1,2,3] mainly considered the changes of pressure and mass flow, and reflected the influence of the engine on the regenerator by the boundary conditions without considering the switching process and the influence of compression and expansion. In this paper, based on the above three characteristics, the regenerator model is established, and the influence of the engine on the regenerator is reflected by using three dimensionless numbers α 0, β 0, γ 0.