CAJ | 학술논문

针对光滑窄矩形通道内简谐脉动流层流-紊流（Re范围为750～4450）过渡特性进行实验研究。研究发现，脉动流加速阶段，摩阻系数大于稳态摩阻系数，而在减速阶段摩阻系数小于稳态摩阻系数。Womersley数对层流-紊流临界 Re有显著影响，在脉动流加速阶段，临界 Re随Womersley数的增大而减小，而在脉动减速部分则相反。通过实验拟合出一适用于预测临界转捩点的经验公式，且与稳态有着良好的衔接。
침대광활착구형통도내간해맥동류층류-문류（Re범위위750～4450）과도특성진행실험연구。연구발현，맥동류가속계단，마조계수대우은태마조계수，이재감속계단마조계수소우은태마조계수。Womersley수대층류-문류림계 Re유현저영향，재맥동류가속계단，림계 Re수Womersley수적증대이감소，이재맥동감속부분칙상반。통과실험의합출일괄용우예측림계전렬점적경험공식，차여은태유착량호적함접。
Experimental study of flow characteristic in smooth narrow rectangular channel under harmonic pulsating flow w hich covers laminar to turbulent flow (Reynolds number 750-4 450) was carried out .The experimental results show that the frictional factors in acceleration phase of pulsating flow are higher than that in steady state ,but lower than that in deceleration phase .Womersley parameter has a significant influence on the critical Reynolds number .The critical Reynolds number decreases with the increase of Womersley parameter in acceleration phase and it is opposite in deceleration phase . An empirical correlation was developed to predict the critical Reynolds number based on the experimental data , and the correlation can fit with critical Reynolds number in steady state .