在介绍螺旋折流板管壳式换热器的结构及原理的基础上，对壳程传热强化及阻力特性的研究现状进行了总结，分析了壳侧流体的流动和换热机理，表明螺旋折流板结构是改善壳侧流动换热性能的有效措施与弓型折流板换热器相比，螺旋折流板换热器的最大特点是单位压降下的壳侧换热系数高。结合具体实例介绍了其在石油化工、能源动力及核能应用等行业中的应用前景。关于螺旋折流板换热器，还有许多问题需要进一步研究，如流动换热的机理以及影响流动换热机理的几何因素、相变情形、介质物性等。

采用高效紧凑式换热器是近年来微型燃气轮机发展取得成功的关键技术之一。本文在燃机参数给定情况下，通过对三种换热表面进行热力计算和分析，结果表明，CC原表面在紧凑式换热器中具有较强的应用潜力。此外，还就温差对压损的影响及燃气旁通量对回热度的影响进行了研究。

Analysis and simulation of rarefied nitrogen gas flow and heat transfer were performed with the Knusden number ranging from O.05 to 1.O, using the direct simulation of Monte Carlo (DSMC) method, The influences of the Kn number and the aspect ratio on the gas temperature and wall heat flux in the microchannels were studied parametrically. The total and local heat fluxes of the microchannel walls varying with the channel inlet velocities were also investigated in detail. It was found that the Kn number and the aspect ratio greatly influence the heat transfer performance of microchan-nels, and both the channel inlet and outlet have higher heat fluxes while the heat flux in the middle part of channels is very low. It is also found that the inlet free stream flow velocity has small affect on the wall total heat flux while it changes the distribution of local heat flux.