CAJ | 학술논문

气液两相流体在垂直上升矩形截面管道内横向冲刷水平布置的柱体时,一定条件下会在柱体后面产生旋涡交替脱落现象.利用管壁压差法来研究气液两相流横掠圆柱体和方柱体时的旋涡脱落特性,得到了涡街的脱落频率和斯特罗哈数的变化情况.实验中雷诺数的范围为0.9×10~4～2.3×10~4,截面含气率的范围为0～0.2.实验结果表明:在一定的含气率范围内,两种柱体涡街的脱落频率与斯特罗哈数都随着截面含气率的增大而增大;方柱体斯特罗哈数增大的梯度与雷诺数无关,圆柱体斯特罗哈数增大的梯度受雷诺数的影响.
기액량상류체재수직상승구형절면관도내횡향충쇄수평포치적주체시,일정조건하회재주체후면산생선와교체탈락현상.이용관벽압차법래연구기액량상류횡략원주체화방주체시적선와탈락특성,득도료와가적탈락빈솔화사특라합수적변화정황.실험중뢰낙수적범위위0.9×10~4～2.3×10~4,절면함기솔적범위위0～0.2.실험결과표명:재일정적함기솔범위내,량충주체와가적탈락빈솔여사특라합수도수착절면함기솔적증대이증대;방주체사특라합수증대적제도여뢰낙수무관,원주체사특라합수증대적제도수뢰낙수적영향.
When a gas-liquid two-phase fluid in a vertically ascending tube with a rectangular section transversely scours a horizontally arranged cylinder,under certain conditions,an alternating vortex shedding phenomenon will occur at the back of the cylinder.By adopting a tube-wall pressure-difference method to study the vortex shedding characteristics of the above flow transversely sweeping across a circular cylinder and a square one,the authors have identified the vortex street shedding frequency and the variation of Strouhal number.During the test,the Reynolds number ranges from 0.9×10~4 to 2.3×10~4 and the sectional gas content has a variation range of 0 to 0.2.The test results indicate that in a certain range of gas content,the vortex-street shedding frequency and Strouhal numbers of the two types of cylinders will increase with an increase of the sectional gas content.The increment gradient of the square cylinder Strouhal number is independent of the Reynolds number while that of the circular one is susceptible to the influence of the Reynolds number.