CAJ | 학술논문

对空气在当量直径0.5 mm和1.0 mm微通道中的流动特性进行数值仿真研究与分析。分析结果表明，微通道在平均马赫数0.15左右就必须考虑可压缩性影响。微通道在Re为1380左右即发生提前转捩现象，提前转捩和可压缩性都将使沿程阻力增加。微通道受进口段影响，压强降较大，但微通道层流进口段长度和湍流进口段长度均小于常规通道。
대공기재당량직경0.5 mm화1.0 mm미통도중적류동특성진행수치방진연구여분석。분석결과표명，미통도재평균마혁수0.15좌우취필수고필가압축성영향。미통도재Re위1380좌우즉발생제전전렬현상，제전전렬화가압축성도장사연정조력증가。미통도수진구단영향，압강강교대，단미통도층류진구단장도화단류진구단장도균소우상규통도。
Numerical experiments are conducted for gaseous flow though microchannels with hydraulic diameter de =0. 5 mm and 1. 0 mm. The experiments results show that compressibility increase significantly when mean Ma is above 0. 15. The transition Reynolds number is brought forward to about 1 380. For the gaseous flow in the entrance length regime, an evident pressure loss is observed. The entrance length of laminar flow and turbulent flow in microchannels is less than that in conventional channels.