In order to weaken the horseshoe vortex, the roughness elements are placed upstream of the blade on the flat plate. A kind of passive control method is proposed. With the help of computational fluid dynamics software Fluent, this paper carries out a study on effects of roughness elements′ heights and positions on the turbulent junction flow. The results show that any roughness elements can weaken the horseshoe vortex. The case is proposed with d/T=1, h/T=1/20 (d is distance between roughness elements and the leading edge of the blade, T is maximum thickness of the blade, h is height of the elements), which colligates spatial scale of elements′ wake, horseshoe vortex′s stream-wise votex′s scale and primary horseshoe vortex′s vorticity. Furthermore, the increasing heights of the roughness elements are beneficial to weaken the main horseshoe vortex, but the vortex legs will be far away from the blade.
WANG Jian-ming, ZHU Kui, WANG Hu-bin, ZHENG Yao-hui
. Effect of roughness elements on the blade-body juncture horseshoe vortex[J]. Journal of Shenyang Aerospace University, 2013
, 30(1)
: 1
-4
.
DOI: 10.3969/j.issn.2095-1248.2013.01.001
[1]Baker C J.The oscillation of horseshoe vortex system[J].J Fluids Eng, 1991, 113(4):89-95.
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[2]周逊, 韩万金.涡轮矩形叶栅中的旋涡模型的进展回顾[J].航空动力学报, 2001, 16(3):198-204.
[3]刘火星, 陈矛章, 蒋浩康.扩压叶栅角区马蹄涡的实验研究[J].工程热物理学报, 2000, 21(6):703-706.
[4]Simpson R L.Junction flows[J].Annu Rev Fluid Mech, 2001, 33:415-43.
[5]Kang K J, Kim T, Song S J.Strengths of horseshoe vortices around a circular cylinder with an upstream cavity[J].J Mech Sci Technol, 2009, 23(7):1773-1778.
[6]Wei Q D, Wang J M, Chen G, et al.Modification of junction flows by altering the section shapes of the cylinders[J].J Visual-Japan, 2008, 11(2):115-124.
[7]Wang J J, Zhang P F, LU S F, et al.Drag reduction of a circular cylinder using an upstream rod[J].Flow Turbul Combust, 2006, 76(1):83-101.
[8]Wang J M, Bi W T, Wei Q D.Effects of an inclined rod on circular cylinder-plate junction flow[J].Exp Fluids, 2009, 46(6):1093-1104.
[9]王建明, 刘炜, 艾延廷, 等.圆柱-平板角区湍流流动控制的风洞试验研究[J].实验流体力学, 2011, 25(5):10-15.
[10]王建明, 刘炜, 徐志晖, 等.文氏效应在叶片根部马蹄涡控制中的应用[J].航空动力学报, 2011, 11:2617-2622.
[11]张华, 吕志咏.后掠翼身交接区流动结构及参数影响研究[J].流体力学实验与测量, 2000, 14(2):16-20.
[12]Gupta A K.Hydrodynamic modification of the horseshoe vortex at a vertical pier junction with ground [J].Phys.Fluids, 1987, 30(4):1213-1215.
[13]Devenport W J, Simpson R L, Dewitz M B, et al.Effects of a leading-edge fillet on the flow past an appendage-body junction[J].AIAA J, 1992, 30(9):2177-2183.
[14]Devenport W J, Simpson R L.Time-dependent and time-averaged turbulence structure near the nose of a wing-body junction[J].J Fluid Mech, 1990, 210(1):23-55.
[15]Baker C J.The turbulent horseshoe vortex[J].J Wind Eng Ind AeroD, 1980, 6(1):9-23.
