基于TR-PIV方法的格栅-空腔流动流场自激振荡空间特征研究

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摘要格栅-空腔流动能够引起流场自激振荡现象，导致诸多工程问题。采用风洞实验方法对流场振荡的空间分布特征问题进行了研究。建立了格栅-空腔实验装置，使用时间分辨粒子图像测速系统（TR-PIV）对空腔不同展向截面的速度场进行了测量，分析了流场特定位置速度振荡的时频特征。研究结论表明：在格栅-空腔流动中，流场自激振荡频率在空间中均匀分布，其斯特罗哈数为0.37左右。在格栅外侧，振荡幅值沿来流方向呈增加-减小-增加变化。在格栅内侧，振荡幅值沿来流方向先增加后减小。振荡幅值沿展向呈对称分布，在展向平分面达到最大值，在空腔壁面处达到最小值。

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	张永昌 1
	徐宇工 2

关键词 ：格栅-空腔流动, 自激振荡, 时间分辨粒子图像测速, 空间分布

Abstract：Grille-cavity flow can cause flow field self-excited oscillations to lead to various engineering problems.Here,wind tunnel tests were used to investigate spatial distribution characteristics of flow field oscillations.A grille-cavity test device was built.Using the time-resolved particle image velocity (TR-PIV) measurement system,velocity fields of the cavity’s sections in different spread directions were measured.The time-frequency characteristics of velocity oscillations at the specific positions of flow flied were analyzed.The results showed that in grille-cavity flow,the flow field self-excited oscillation frequencies are uniformly distributed in space and their Strouhal number is about 0.37; on the outside of the grille,the oscillation amplitudes have a variation of increase-decrease-increase in flow direction; on the inside of the grille,the oscillation amplitudes increase firstly and then decrease; the oscillation amplitudes are symmetrically distributed along the spread direction to reach the maximum on the spread bisector plane,and the minimum on the cavity’s wall surface.

Key words： grille-cavity flow self-excited oscillation TR-PIV spatial distribution

收稿日期: 2017-07-12 出版日期: 2018-11-28

引用本文:

张永昌 1,徐宇工 2. 基于TR-PIV方法的格栅-空腔流动流场自激振荡空间特征研究[J]. 振动与冲击, 2018, 37(23): 234-240.
ZHANG Yongchang1, XU Yugong2. Spatial distribution characteristics of self-excited oscillations in a grille-cavity flow field based on TR-PIV method. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(23): 234-240.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I23/234

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