IMECH-IR  > 高温气体动力学国家重点实验室
Alternative TitleThe experimental study on boundary layer transition of sharp cone in hypersonic shock tunnel
Thesis Advisor赵伟 研究员
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Discipline流体力学
Keyword高超声速边界层转捩 尖锥 热流 第二模态波
Other Abstract

7°半锥角的大尺寸尖锥模型在力学所 JF8A 激波风洞中开展了高超声速边界层转捩的实验研究。主要内容概括如下:
2)利用高频响 PCB 传感器得到尖锥模型不同来流条件下沿不同母线的脉动压力分布。通过对脉动压力结果的功率谱分析,发现尖锥边界层转捩过程中有明显的二次模态波及其高次谐波出现。验证了其频率与来流雷诺数以及流向距离的关系。二次模态波在层流区开始出现,其幅值在转捩过程中逐渐增大, 频率随着边界层厚度的增加而减小。湍流阶段二次模态波破碎消失。


The transition of hypersonic boundary layer is one of the essential scientificproblems hindering the development of hypersonic technology. The related theoreticalresearch is still undergoing and needs to be broken through because of its complexity.The Direct Numerical Simulation (DNS) has made great progress in recent decades for the study of the hypersonic boundary layer transition. However, it is limited by thenumerical accuracy and computational capacity. Moreover, the flight test is tooexpensive and is hard to collect enough experimental data, ground tests still play animportant role to the study of hypersonic boundary layer transition. Although the flownoise level of shock tunnel is much higher than that in the actual flight environment,the study of the hypersonic boundary layer transition in the shock tunnel is still ofgreat significance to analyze the current massive data and give advise to theaerodynamic engineering.In this thesis, a large sharp cone model with a semi-cone angle of 7 degree ischosen to conduct the experimental study of hypersonic boundary layer transition inthe JF8A shock tunnel. The main contents in the thesis are summarized as below:(1) Thin film resistance thermometer was used to measure the heat flux of sharpcone under three different flow conditions. The heat-flux results indicated thattransition occured in the cone boundary layers and the transition zone had the highestheat flux. The probability densities distributions of heat-flux in laminar and turbulentregion were close to Gauss distribution . It deviated from Gauss distribution intransition condition .(2) The high-frequency PCB pressure sensors were used to measure the pressurefluctuation on the cone under three different flow conditions. The results of PowerSpectrum Density (PSD) of fluctuation pressure indicated that second mode instabilitywaves and their high-order harmonic waves appeared in transition. The relationshipbetween the frequency of second mode instability waves and the Reynolds numbers offreestream flow and its locations was verified. The second mode instability wavesfirstly appeared in laminar region and its amplitude increased gradually during thetransition process. And the frequency decreased with the increase of the thickness ofthe boundary layer. The second mode wave broke in the turbulent phase.(3) The positions of the peak of the heat-flux fluctuations and of the peak ofpressure fluctuations were compared. The results showed that the two peaks occuredat the different position, and the peak of the fluctuations of the heat-flux was in aheadof the peak of pressure fluctuation

Call NumberMas2018-013
Document Type学位论文
Recommended Citation
GB/T 7714
卢盼. 高超声速激波风洞尖锥边界层转捩研究[D]. 北京. 中国科学院大学,2018.
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