摘要
该文采用旋涡强度方法对冲击射流涡结构进行了深入研究。首先将粒子成像测速技术(P IV)测量得到的原始流场图片进行相应处理得到原始速度场,再利用b ior5.5双正交小波分析得到消除高频噪声的流场结构;然后对此进行涡量和旋涡强度计算,得到相应的涡量场和旋涡强度场。与涡量方法相比,因旋涡强度方法排除了剪切作用的影响,故可以更有效地分析流场中的涡结构。进而得到了冲击射流中的旋涡强度随压比、冲击距离、喷嘴唇厚等参数的变化规律。
The swirling strength method was used to investigate the vortex structure of an impinging jet. The initial let flow field was obtained from particle image velocimetry （PIV） measurements. Then a bior5.5 biorthogonal wavelet analysis was used to obtain the flow field structure without high-frequency noise. The vorticity field and swirling strength field were then calculated from the flow structure. Since the swirling strength method eliminates the effect of the shear, it is a better method to analyze the vortex structure than the vorticity method. The swirling strength variations can then be obtained as a function of the impinging pressure ratio, impinging distance, nozzle-lip thickness, etc.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第8期1466-1469,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(10572074
90305014)
关键词
涡结构
小波分析
涡量
旋涡强度
冲击射流
vortex structure
wavelet analysis
vorticity
swirling strength
impinging jet
