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Since the lateral jet in a horizontal stream can reduce the friction of bionic jet surface, a bionic jet surface model is established by using the SST k- turbulence model in numerical simulation of bionic jet surface for jet hole with different shape, and experimental verification of the numerical simulation results is done. Results show that, when the flow length and span length of the jet hole are kept constant, the drag reduction of the third model with broken-line jet hole is the best; the broken-line jet hole is simplified to an arc-shaped hole, when its radius r=35mm, the drag reduction rate increases with jet velocity; furthermore, the best drag reduction can be obtained when r = 4 mm, the maximum drag reduction rate is 9.51%. Drag reduction is produced because the jet fluid injected to the lateral mainstream field through jet holes, would change the flow field structure of boundary layer near jet surface, and make the thickness of the underlying viscous sublayer in boundary layer increase. As a result, the gradient of normal velocity, perpendicular to jet surface, is decreased, and thus reduces the wall shear stress. Meanwhile, the low speed jet fluid is blocked at the boundary layer, reducing the sweep of high speed fluid on the wall, which contributes to the drag reduction.
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Keywords:
- drag reduction /
- jet hole shape /
- numerical simulation /
- boundary layer
[1] Zhang H, Fan B C, Chen Z H, Chen S, Li H Z 2013 Chin. Phys. B 22 104701
[2] Mei D J, Fan B C, Chen Y H, Ye J F 2010 Acta Phys. Sin. 59 8335 (in Chinese) [梅栋杰, 范宝春, 陈耀慧, 叶经方 2010 59 8335]
[3] Han Z W, Xu X X, Ren L Q 2005 Tribology 25 578 (in Chinese) [韩志武, 许小侠, 任露泉 2005 摩擦学学报 25 578]
[4] Wang B, Wang J D, Chen D R 2014 Acta Phys. Sin. 63 074702 (in Chinese) [王宝, 汪家道, 陈大融 2014 63 074702]
[5] Song B W, Ren F, Hu H B, Guo Y H 2014 Acta Phys. Sin. 63 054708 (in Chinese) [宋保维, 任峰, 胡海豹, 郭云鹤 2014 63 054708]
[6] Tian L M, Ren L Q, Li Q P, Han Z W, Jiang X 2007 J. Bionic. Eng. 4 109
[7] Lim H C, Lee S J 2004 Fluid Dyn. Res. 35 107
[8] Wang J J 1998 Journal of Beijing University of Aeronautics and Astronautics 24 31 (in Chinese) [王晋军 1998 北京航空航天大学学报 24 31]
[9] Walsh M J 1983 AIAA J. 21 485
[10] Cai J S, Liu Q H 2010 Acta Aerodynamica Sinica 28 553 (in Chinese) [蔡晋生, 刘秋洪 2010 空气动力学学报 28 553]
[11] Venukumar B, Jagadeesh G, Reddy K P J 2006 Phys. Fluids 18 18101
[12] Jiang G Q, Ren X W, Li W 2010 Advances in Water Science 21 307 (in Chinese) [姜国强, 任秀文, 李炜 2010 水科学进展 21 307]
[13] Robert P W, Frank C T 1979 J. aircraft 16 701
[14] Matthew J B, Joseph A S, Larry A R 1997 J. Propul. Power 13 257
[15] Zhang D W, Wang Q, Hu H Y 2012 Journal of Aerospace Power 27 2378 (in Chinese) [张丁午, 王强, 胡海洋 2012 航空动力学报 27 2378]
[16] Gu Y Q, Zhao G, Zhao H L, Zheng J X, Wang F, Xiao L, Liu W B 2012 Acta Armamentarii 33 1230 (in Chinese) [谷云庆, 赵刚, 赵华琳, 郑金兴, 王飞, 肖磊, 刘文博 2012 兵工学报 33 1230]
[17] Li F, Zhao G, Liu W X, Sun Z Z 2014 Journal of Basic Science and Engineering 22 574 (in Chinese) [李芳, 赵刚, 刘维新, 孙壮志 2014 应用基础与工程科学学报 22 574]
[18] Menter F R 1994 AIAA J. 32 1598
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[1] Zhang H, Fan B C, Chen Z H, Chen S, Li H Z 2013 Chin. Phys. B 22 104701
[2] Mei D J, Fan B C, Chen Y H, Ye J F 2010 Acta Phys. Sin. 59 8335 (in Chinese) [梅栋杰, 范宝春, 陈耀慧, 叶经方 2010 59 8335]
[3] Han Z W, Xu X X, Ren L Q 2005 Tribology 25 578 (in Chinese) [韩志武, 许小侠, 任露泉 2005 摩擦学学报 25 578]
[4] Wang B, Wang J D, Chen D R 2014 Acta Phys. Sin. 63 074702 (in Chinese) [王宝, 汪家道, 陈大融 2014 63 074702]
[5] Song B W, Ren F, Hu H B, Guo Y H 2014 Acta Phys. Sin. 63 054708 (in Chinese) [宋保维, 任峰, 胡海豹, 郭云鹤 2014 63 054708]
[6] Tian L M, Ren L Q, Li Q P, Han Z W, Jiang X 2007 J. Bionic. Eng. 4 109
[7] Lim H C, Lee S J 2004 Fluid Dyn. Res. 35 107
[8] Wang J J 1998 Journal of Beijing University of Aeronautics and Astronautics 24 31 (in Chinese) [王晋军 1998 北京航空航天大学学报 24 31]
[9] Walsh M J 1983 AIAA J. 21 485
[10] Cai J S, Liu Q H 2010 Acta Aerodynamica Sinica 28 553 (in Chinese) [蔡晋生, 刘秋洪 2010 空气动力学学报 28 553]
[11] Venukumar B, Jagadeesh G, Reddy K P J 2006 Phys. Fluids 18 18101
[12] Jiang G Q, Ren X W, Li W 2010 Advances in Water Science 21 307 (in Chinese) [姜国强, 任秀文, 李炜 2010 水科学进展 21 307]
[13] Robert P W, Frank C T 1979 J. aircraft 16 701
[14] Matthew J B, Joseph A S, Larry A R 1997 J. Propul. Power 13 257
[15] Zhang D W, Wang Q, Hu H Y 2012 Journal of Aerospace Power 27 2378 (in Chinese) [张丁午, 王强, 胡海洋 2012 航空动力学报 27 2378]
[16] Gu Y Q, Zhao G, Zhao H L, Zheng J X, Wang F, Xiao L, Liu W B 2012 Acta Armamentarii 33 1230 (in Chinese) [谷云庆, 赵刚, 赵华琳, 郑金兴, 王飞, 肖磊, 刘文博 2012 兵工学报 33 1230]
[17] Li F, Zhao G, Liu W X, Sun Z Z 2014 Journal of Basic Science and Engineering 22 574 (in Chinese) [李芳, 赵刚, 刘维新, 孙壮志 2014 应用基础与工程科学学报 22 574]
[18] Menter F R 1994 AIAA J. 32 1598
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