超声速流体振荡器流动特性数值研究
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摘要
通过改变流体振荡器喷嘴宽度、喉道宽度,对某种结构的超声速流体振荡器进行二维非稳态数值模拟。计算结果表明:当喷嘴宽度远小于混合腔入口宽度时,振荡器的延迟时间t0随着喉道宽度的增加而减小;当喷嘴宽度接近混合腔入口宽度时,延迟时间t0随喉道宽度改变的变化不明显;当保持喷嘴宽度不变时,振荡周期随着喉道宽度的增大而逐渐减小,但减小幅度越来越小;存在一个临界喉道宽度值,一旦超过这个临界值,超声速流体振荡器不能起振。
The numerical simulation of supersonic fluidic oscillator is carried out by changing the width of nozzle and throat. The results show that the delay time of the oscillator decreases with the increase of the throat width when the nozzle width is much smaller than the inlet width of mixing chamber,and there is no significant change of the delay time with increasing the throat width when the nozzle width is close to the inlet width of mixing chamber. the oscillation period decreases as the throat width increases under constant nozzle width. The oscillator cannot form oscillation jet when the throat width exceeds critical value.
The numerical simulation of supersonic fluidic oscillator is carried out by changing the width of nozzle and throat. The results show that the delay time of the oscillator decreases with the increase of the throat width when the nozzle width is much smaller than the inlet width of mixing chamber,and there is no significant change of the delay time with increasing the throat width when the nozzle width is close to the inlet width of mixing chamber. the oscillation period decreases as the throat width increases under constant nozzle width. The oscillator cannot form oscillation jet when the throat width exceeds critical value.
引文
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[2] WOSZIDLO R,WYGNANSKI I. Parameters governing separation control with sweeping jet actuators[C]//29th AIAA Applied Aerodynamics Conference. 2011:3172.
[3]王忠,李甘牛,陈滨.一种单出口流体振荡器件特性实验研究[J].南京航空航天大学学报,2015,47(6):877-883.
[4]王驰宇.射流流量计关键技术研究[D].杭州:浙江大学,2008.
[5] BEALE R B,LAWLER M T. Development of a wall-attachment fluidic oscillator applied to volume flow metering[C]//Flow:Its measurement and control in science and industry. 1974:989-996.
[6]程宁,谢代梁.微尺度射流流量计的设计与仿真研究[J].传感器与微系统,2011,30(8):70-72.
[7]陈圣涛.静止式气波制冷机振荡与制冷特性的研究[D].大连:大连理工大学,2008.
[8]杨军.正反馈式射流振荡器性能研究及应用[D].大连:大连理工大学,2008.
[9]孙厚钧,高军,赵静野.用振荡射流抑制蓝藻滋长防止泥沙淤积[J].水工业市场,2012(9):57-61.
[10] GREGORY J,TOMAC M N. A review of fluidic oscillator development[C]//43rd AIAA Fluid Dynamics Conference. 2013:2474.
[11] TOMAC M N,GREGORY J. Frequency studies and scaling effects of jet interaction in a feedback-free fluidic oscillator[C]//50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. 2012:1248.
[12] SUN B,FENG F,WU X,et al. Experimental investigations of cavity-actuated supersonic oscillating jet[J]. Experimental Thermal and Fluid Science,2015,68:155-162.
[13] YANRONG L,SOMEYA S,KOSO T,et al. Characterization of periodic flow structure in a small-scale feedback fluidic oscillator under low-Reynolds-number water flow[J]. Flow Measurement and Instrumentation,2013,33:179-187.
[14] VON GOSEN F,OSTERMANN F,WOSZIDLO R,et al.Experimental investigation of compressibility effects in a fluidic oscillator[C]//53rd AIAA Aerospace Sciences Meeting. 2015:0782.
[15]吴西云,董金钟.射流振荡器的回流特性和切换特性研究[J].科学技术与工程,2016,16(32):314-318.
[16]田思,吴敏,朱玲,等.方背式MIRA模型射流主动控制气动减阻研究[J].重庆理工大学学报(自然科学),2018(5):89-96.
[17]王博滟,张靖周,吕元伟.波瓣喷嘴射流冲击平面靶板对流换热数值研究[J].重庆理工大学学报(自然科学),2018(4):87-93,106.
[18] BOBUSCH B C,WOSZIDLO R,KRUGER O,et al. Numerical Investigations on Geometric Parameters Affecting the Oscillation Properties of a Fluidic Oscillator[C]//21st AIAA Computational Fluid Dynamics Conference.2013:2709.
[19] Mc DONOUGH J R. Effect of geometrical parameters on flow-switching frequencies in 3D printed fluidic oscillators containing different liquids[J]. Chemical Engineering Research and Design,2017,117:228-239.
[20] GOKOGLU S,KUCZMARSKI M,CULLEY D,et al. Numerical studies of a supersonic fluidic diverter actuator for flow control[C]//5th Flow Control Conference. 2010:4415.
[21] GOKOGLU S,KUCZMARSKI M,CULLEY D,et al. Numerical studies of a fluidic diverter for flow control[C]//39th AIAA Fluid Dynamics Conference. 2009:4012.
[22] RAMAN G,HAILYE M,RICE E J. Flip-flop jet nozzle extended to supersonic flows[J]. AIAA Journal,1993,31(6):1028-1035.
[23]吴凛,李艳荣,湛从昌,等.小型反馈射流振动器的动态特性研究[J].机械科学与技术,2016,35(12):1894-1899.
[24] KRUGER O,BOBUSCH B C,WOSZIDLO R,et al. Numerical Modeling and Validation of the Flow in a Fluidic Oscillator[C]//21st AIAA Computational Fluid Dynamics Conference. 2013:3087.