CAJ | 학술논문

Hartmann-Sprenger(H-S)管在一定条件下,可以使射流气体产生按一定频率激励的强烈振荡.对H-S管的振荡流动进行了数值模拟和实验研究.数值模拟结果显示出H-S管在吞吐模式下流场的周期变化,在对应的试验瞬态纹影图上,则观察到相应的吞吐射流气体,揭示了H-S管激励的工作机理.通过大量的实验研究,对小管径共振管的频率估算公式进行了修正,提高了振荡频率估算的准确度,为以后设计给定激励频率的射流喷嘴奠定了基础.
Hartmann-Sprenger(H-S)관재일정조건하,가이사사류기체산생안일정빈솔격려적강렬진탕.대H-S관적진탕류동진행료수치모의화실험연구.수치모의결과현시출H-S관재탄토모식하류장적주기변화,재대응적시험순태문영도상,칙관찰도상응적탄토사류기체,게시료H-S관격려적공작궤리.통과대량적실험연구,대소관경공진관적빈솔고산공식진행료수정,제고료진탕빈솔고산적준학도,위이후설계급정격려빈솔적사류분취전정료기출.
Under some certain conditions in Hartmann-Sprenger (H-S) tube there can be resulted in intense jet oscillation at a specified frequency.The oscillation flow in the H-S tube was investigated numerically and experimentally.The numerical simulation results indicate the periodical changes of the flow field while the transient schlieren images of the corresponding case show the taking-in jet and the taking-out shock wave.Those results reveal the mechanism of the excited oscillation in the H-S tube.Based on the experimental data,the expression for estimating the oscillation frequency in the small-diameter case was modified which can help to design the jet nozzle at a given excitation frequency.