基于大涡模拟的抑制孔腔涡旋流动与脉动压力的流动控制方法研究
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摘要
水下航行体表面一般开有流水孔、通气孔、压载水舱格子板孔等各种孔腔。孔腔流动时常伴随着各类振荡,引起结构的振动和疲劳,还会激发很强的噪声,因而对孔腔流动进行控制非常具有理论和工程实际意义。文章主要探索适用于水动力领域的流动控制方法。首先,在前期工作基础之上,采用大涡模拟方法(LES)对孔腔涡旋流动和速度场进行了数值模拟。其次,在孔腔的前缘开槽进行吹喷、抽吸,采用不同控制参数(控制方式、控制流速、开槽宽度以及开槽位置)计算低水速下孔腔的涡旋流场、脉动压力等,详细地分析各参数的控制效果,选取有效的控制参数,得到有效的控制方案;最后,计算了中高水速控制流动,评估流动控制方案的控制效果。
There are many kinds of cavities on the surface of submarine generally such as flood holes,vents, panel holes of ballast water tank, and so on. Cavity flow always accompanies all kinds of fluid oscillations, resulting in structural vibration and fatigue and inducing obvious noise. So the control of cavity flow has important significance in theory and practical engineering. This paper mainly researches on control methods of cavity flow in hydrodynamics. First, vortical flow and velocity field of cavity are computed by LES based on previous work. Then, by adding blowing and suction by opening narrow slot at the upstream of cavity, vortical flow and pressure fluctuations are calculated in low water velocity at different control parameters such as control mode, control velocity, width and location of the opening slot. Suppression effect of different control parameters are analyzed in detail. The effective control methods are obtained by selecting efficient control parameters. Finally, control flows of high water velocity are computed to estimate the efficiency of the selected control method.
There are many kinds of cavities on the surface of submarine generally such as flood holes,vents, panel holes of ballast water tank, and so on. Cavity flow always accompanies all kinds of fluid oscillations, resulting in structural vibration and fatigue and inducing obvious noise. So the control of cavity flow has important significance in theory and practical engineering. This paper mainly researches on control methods of cavity flow in hydrodynamics. First, vortical flow and velocity field of cavity are computed by LES based on previous work. Then, by adding blowing and suction by opening narrow slot at the upstream of cavity, vortical flow and pressure fluctuations are calculated in low water velocity at different control parameters such as control mode, control velocity, width and location of the opening slot. Suppression effect of different control parameters are analyzed in detail. The effective control methods are obtained by selecting efficient control parameters. Finally, control flows of high water velocity are computed to estimate the efficiency of the selected control method.
引文
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[13]邓玉清,张楠.孔腔脉动压力及其波数频率谱的大涡模拟研究[J].船舶力学,2017,21(10):1199-1210.Deng Yuqing,Zhang Nan.Computation of wall pressure fluctuations and wavenumber-frequency spectrum of cavity using large eddy simulation[J].Journal of Ship Mechanics,2017,21(10):1199-1210.
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[15]邓玉清.流动控制对孔腔涡旋流动与脉动压力影响的大涡模拟研究[D].无锡:中国船舶科学研究中心,2017.Deng Yuqing.Research on vortical flow and pressure fluctuations of cavity with flow control approach by large eddy simulation[D].Wuxi:China Ship Scientific Research Center,2017.
[2]Arunajatesan S,Sinha N.Modeling approach for reducing Helmholtz resonance[J].AIAA,2005-2858-535.N.
[3]Ukeiley L S,et al.Suppression of pressure loads in resonating cavities through blowing[J].AIAA,2003-181.
[4]Ukeiley L S,et al.Control of pressure loads in complex cavity configurations[J].AIAA,2007-1238.
[5]Hamed A,Das K,Basu D.Numerical simulations of fluidic control for transonic cavity flows[J].AIAA,2004-0429.
[6]Suponitsky V,Avital E,Gaster M.On three-dimensionality and control of incompressible cavity flow[J].Physics of Fluids,2005,17(10):104-103.
[7]Kourta,A,Vitale E.Analysis and control of cavity flow[J].Physics of Fluids,2008,20:077104.
[8]张明敏,何祚镛.导流板对腔口流体自持振荡影响的研究[J].应用力学学报,1995,12(6):9-16.Zhang Mingmin,He Zuoyong.Influence of flange plate on self-sustained oscillation of cavity[J].Chinese Journal of Applied Mechanics,1995,12(6):9-16.
[9]张楠,沈泓萃,姚惠之,朱锡清,俞孟萨.孔穴流激噪声的计算与验证研究[J].船舶力学,2008,12(5):799-805.Zhang Nan,Shen Hongcui,Yao Huizhi,Zhu Xiqing,Yu Mengsa.Validation and calculation of flow-induced noise of cavity[J].Journal of Ship Mechanics,2008,12(5):799-805.
[10]张楠.孔腔流动和流激噪声机理及耦合计算方法研究[D].无锡:中国船舶科学研究中心,2010.Zhang Nan.Research on mechanism and hybrid computation approach for cavity flow and flow induced noise[D].Wuxi:China Ship Scientific Research Center,2010.
[11]张楠,沈泓萃,朱锡清,姚惠之,谢华.三维孔腔流激噪声的大涡模拟与声学类比预报与验证研究[J].船舶力学,2010,14(1-2):181-190.Zhang Nan,Shen Hongcui,Zhu Xiqing,Yao Huizhi,Xie hua.Validation and prediction of flow induced noise of 3-dimensional cavity with large eddy simulation and acoustic analogy[J].Journal of Ship Mechanics,2010,14(1-2):181-190.
[12]张楠,李亚,王志鹏,王星,张晓龙.基于LES和Powell涡声理论的孔腔流激噪声数值模拟研究[J].船舶力学,2015,19(11):1393-1408.Zhang Nan,Li Ya,Wang Zhipeng,Wang Xing,Zhang Xiaolong.Numerical simulation on the flow induced noise of cavity by LES and Powell vortex sound theory[J].Journal of Ship Mechanics,2015,19(11):1393-1408.
[13]邓玉清,张楠.孔腔脉动压力及其波数频率谱的大涡模拟研究[J].船舶力学,2017,21(10):1199-1210.Deng Yuqing,Zhang Nan.Computation of wall pressure fluctuations and wavenumber-frequency spectrum of cavity using large eddy simulation[J].Journal of Ship Mechanics,2017,21(10):1199-1210.
[14]Camussi R,et al.Statistical properties of wall pressure fluctuations over a forward-facing step[J].Physic of Fluids,2008,20.
[15]邓玉清.流动控制对孔腔涡旋流动与脉动压力影响的大涡模拟研究[D].无锡:中国船舶科学研究中心,2017.Deng Yuqing.Research on vortical flow and pressure fluctuations of cavity with flow control approach by large eddy simulation[D].Wuxi:China Ship Scientific Research Center,2017.