Jet sweeping angle control by fluidic oscillators with master-slave designs  

作　　者：Ziyan LI Kaiwen ZHOU Yingzheng LIU Xin WEN 

机构地区：[1]Key Lab of Education Ministry for Power Machinery and Engineering,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Gas Turbine Research Institute,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Chinese Journal of Aeronautics》2021年第5期145-162,共18页中国航空学报（英文版）

基　　金：financial support from the National Natural Science Foundation of China(Nos.12072196 and 11702172);Science and Technology Commission of Shanghai Municipality(No.19JC1412900);Aeronautics Power Foundation(No.6141B09050393);Key Laboratory of Aerodynamic Noise Control(No.ANCL20190106)extended to this study。

摘　　要：The fluidic oscillator is an instrument that can continuously generate a spatially sweeping jet entirely based on its internal geometry without any moving parts.However,the traditional fluidic oscillator has an inherent limitation,that is,the spreading angle cannot be controlled independently,rather by the jet volume flow rate and internal geometry.Accordingly,two types of fluidic oscillators based on the master-slave design are developed in current study to decouple this correlation.In both designs,the master layer inherits the similar oscillation mechanisms of a sweeping jet,and the slave layer resembles a steady jet channel.The difference between the two designs is that Design A has a short diverging exit in the slave layer,but Design B adds a long interaction chamber in the exit channel to intensify flow instability.The external flow fields and governing oscillation properties of these two designs are experimentally explored with time-resolved Particle Image Velocimetry(PIV),while the internal flow dynamics and driving oscillation mechanisms are numerically investigated.By fixing the total volume flow rate,the jet spreading angle of Design A can be increased smoothly from 0°to above 100°by increasing the proportion of master layer’s flow rate from 0 to 100%.For Design B,the control authority of the master layer is significantly enhanced by adding the interaction chamber in the slave layer.In addition,the added chamber causes notable jet oscillation even when the master layer has none input.

关 键 词：Adjustable spreading angle CFD Fluidic devices Master-slave fluidic oscillator TR-PIV 

分 类 号：V22[航空宇航科学与技术—飞行器设计]