典型文献
Characteristics of Oscillation in Cavity of Helmholtz Nozzle Generating Self-excited Pulsed Waterjet
文献摘要：
Cavity flow oscillations in the axisymmetric cavity are critical to the operating effiiciency of self-excited pulsed water-jets,which are widely employed in many practical applications.In this study,the behaviors of a turbulent flow in axisymmetric cavities causing cavity flow oscillations are investigated based on wall pressure characteristics.Experi-ments are performed using four Helmholtz nozzles with varying length-to-radius ratios at flow velocities of 20-80 m/s.Three orders of hydrodynamic modes in axisymmetric cavity are obtained through the spectral analysis of wall pressure.Based on the experimental results,the empirical coefficient of Rossiter's formula is modified,and the values of the parameter phase lag and the ratio of convection velocity to free stream velocity are obtained as 0.061 and 0.511,respectively.In addition,the spectral peak with a relatively constant frequency shows that the flow-acoustic resonance is excited significantly.A modified model is introduced based on the fluidic networks to predict the lock-on frequency.The results obtained can provide a basis for the structural optimization of the nozzle to improve the performance of self-excited pulsed waterjets.
文献关键词：
中图分类号：
作者姓名：
Miao Yuan;Deng Li;Yong Kang;Hanqing Shi;Haizeng Pan
作者机构：
Hubei Key Laboratory of Waterjet Theory and New Technology,Wuhan University,Wuhan 430072,China;Schoolof Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China
文献出处：
引用格式：
[1]Miao Yuan;Deng Li;Yong Kang;Hanqing Shi;Haizeng Pan-.Characteristics of Oscillation in Cavity of Helmholtz Nozzle Generating Self-excited Pulsed Waterjet)[J].中国机械工程学报,2022(03):264-274
A类：
Waterjet,waterjets
B类：
Characteristics,Oscillation,Cavity,Helmholtz,Nozzle,Generating,Self,excited,Pulsed,flow,oscillations,axisymmetric,cavity,are,critical,operating,effiiciency,self,pulsed,which,widely,employed,many,practical,applications,In,this,study,behaviors,turbulent,cavities,causing,investigated,wall,pressure,characteristics,Experi,ments,performed,four,nozzles,varying,length,radius,ratios,velocities,Three,orders,hydrodynamic,modes,obtained,through,spectral,analysis,Based,experimental,results,empirical,coefficient,Rossiter,formula,modified,values,parameter,phase,lag,convection,velocity,free,stream,respectively,addition,peak,relatively,constant,frequency,shows,that,acoustic,resonance,significantly,model,introduced,fluidic,networks,predict,lock,provide,basis,structural,optimization,improve,performance
AB值：
0.586069
相似文献
机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
