In this paper, a three dimensional numerical model of fully developed periodic flow in a CWPSR (Cross Wavy Primary Surface Recuperator) of a micro-gas turbine system was established. Effect of air hole leakage on flow and heat transfer of high temperature gas core and compressed air core was analyzed. Analysis results show that with leakage of air hole considered, flow velocity of compressed air from air hole flowing into gas core is far greater than that of high temperature gas. In addition, the flow is opposite to each other. As a result, the flow resistance in gas channel increases. With leakage of air hole considered, heat convection between gas core and air core weakens. When the diameter of air hole increases by 50μm, maximum temperature in gas core increases by 1 K in a period. The performance of heat recovery for regenerator is degraded. Thermal ratio decreases with the improvement the diameter of air hole. When the diameter of air hole increases by 50μm, thermal ratio decreases by about 0.3%. The flow in the gas and air channel is anti-symmetry along the centre of channel. The flow of fluid is fluctuating. The flow velocity of gas is much larger than that of air. The results of this study can be used to test the performance of a recuperator.

中文翻译：

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交叉波纹初级表面换热器中气孔泄漏对流动和传热的影响

在本文中，建立了微燃气轮机系统的CWPSR（交叉波浪主表面换热器）中充分发展的周期性流动的三维数值模型。分析了气孔泄漏对高温气芯和压缩空气芯流动和传热的影响。分析结果表明，考虑到气孔的泄漏，从气孔流入气芯的压缩空气的流速远大于高温气体的流速。另外，流程彼此相反。结果，气体通道中的流动阻力增加。考虑到气孔的泄漏，气芯与气芯之间的热对流减弱。当气孔直径增加50μm时，气芯中的最高温度会在一段时间内增加1K。蓄热器的热回收性能下降。随着气孔直径的增加，热比降低。当气孔直径增加50μm时，热比率降低约0.3％。气体和空气通道中的流动沿通道中心是反对称的。流体流量在波动。气体的流速比空气的流速大得多。这项研究的结果可用于测试同流换热器的性能。