带三维扰流元的方形通道内流动换热的数值模拟研究

推进技术 ›› 2018, Vol. 39 ›› Issue (11): 2522-2530.

带三维扰流元的方形通道内流动换热的数值模拟研究

郭涛,朱惠人,陈剑,韩宗玉

西北工业大学动力与能源学院，陕西西安 710072,西北工业大学动力与能源学院，陕西西安 710072,西北工业大学动力与能源学院，陕西西安 710072,西北工业大学动力与能源学院，陕西西安 710072

发布日期:2021-08-15

Numerical Simulation on Flow and Heat Transfer in a Square Channel with Three-Dimensional Turbulator

School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China and School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China

Published:2021-08-15

摘要/Abstract

摘要： 在涡轮叶片内部冷却通道中一般都布置扰流结构以强化换热，带走传入的热量来保护叶片。针对一种三维扰流结构，在布置有该结构的方形通道内，研究了流动参数与结构参数对通道内流动与换热特性的影响。扰流元高为通道当量直径的1/8。雷诺数变化范围为1.5×104～8.0×104，扰流元流向间距变化范围为3～10倍扰流元高度。结果表明:针对该结构，雷诺数的变化只影响换热强度的大小，并不影响换热分布。同一换热面上扰流元顺排的换热效果比差排方式更好。随着扰流元流向间距的增大，通道换热面的平均努赛尔数比和通道流阻系数比不断下降，扰流元间距达到其8倍高度以上，下降速度减缓。扰流元张角在80°附近时，有最佳的换热强化效果。

关键词: 三维扰流元；数值模拟；换热特性；流动特性

Abstract: In the internal cooling channels of turbine blade， the turbulators are usually employed to enhance the heat transfer and take away the heat conducted into the blade walls， therefore protect the blade. A kind of three dimension turbulaor is investigated in a square duct. The effects of the flow and structure parameters on the flow and heat transfer characters are studied. The height of the turbulator is 1/8 of the channel equivalent diameter. The Reynolds number is changed from 1.5×104 to 8.0×104. The pitches between turbulators in the flow direction are 3～10 times of the turbulator’s height. The results show that the change of the Reynolds number only affects the heat transfer intensity， and does not affect the heat transfer distribution character. The aligned arrangement of turbulator may cause higher heat transfer enhancement than the staggered arrangement. With the increase of pitch between the turbulators， the average Nusselt number ratio and the flow resistance coefficient ratio of the channel are decreasing. This decreasing trend slows down when the pitch is greater than 8 times of turbulator’s height. The best heat transfer enhancement can be achieved when the front angle of turbulators is about 80°.

Key words: Three-dimension turbulator；Numerical simulation；Heat transfer character；Flow character

郭涛,朱惠人,陈剑,韩宗玉. 带三维扰流元的方形通道内流动换热的数值模拟研究[J]. 推进技术, 2018, 39(11): 2522-2530.

GUO Tao,ZHU Hui-ren,CHEN Jian,HAN Zong-yu. Numerical Simulation on Flow and Heat Transfer in a Square Channel with Three-Dimensional Turbulator[J]. Journal of Propulsion Technology, 2018, 39(11): 2522-2530.

参考文献

[1] 朱莉亚, 徐国强. 涡轮冷却技术对航空发动机性能的影响[J]. 推进技术, 2014, 35(6): 796-798. (ZHU Li-ya, XU Guo-qiang. Influence of Turbine Cooling Technology on Aero-Engine Performance[J]. Journal of Propulsion Technology, 2014, 35(6): 796-798.)
[2] Chanteloup D, Juaneda Y, Bo?Lcs A. Combined 3D Flow and Heat Transfer Measurements in a 2-Pass Internal Coolant Passage of Gas Turbine Airfoils[R]. ASME GT-2002-30214.
[3] Han J C. Heat Transfer and Friction in Channels with Two Opposite Rib-Roughened Walls[J]. Journal of Heat Transfer, 1984, 106(4): 774-781.
[4] Han J C. Heat Transfer and Friction Characteristics in Rectangular Channels with Rib Turbulators[J]. Journal of Heat Transfer, 1988, 110(2): 321-328.
[5] Ekkad S V, Han J C. Detailed Heat Transfer Distributions in Two-Pass Square Channels with Rib Turbulators[J]. International Journal of Heat & Mass Transfer, 1997, 40(11): 2525-2537.
[6] Han J C, Dutta S, Ekkad S V. Gas Turbine Heat Transfer and Cooling Technology[M]. New York: Taylor & Francis, 2000.
[7] 吴双应, 李友荣, 刘江梅. 肋片强化传热的热力学判据[J]. 重庆大学学报(自然科学版), 2000, 23(5): 135-138.
[8] 张宗卫, 朱惠人, 王振伟, 等. 出流孔位置对带肋矩形通道换热特性的影响[J], 推进技术, 2011, 32 (4): 582-585. (ZHANG Zong-wei, ZHU Hui-ren, WANG Zhen-wei, et al. Influence of Bleed Hole Location on Heat Transfer Inrectangular Channels with Ribs[J]. Journal of Propulsion Technology, 2011, 32(4):582-585.)
[9] 郭涛, 朱惠人, 李广超, 等. 带肋和双排出流孔通道的流动特性[J]. 推进技术, 2007, 28(4): 400-402.(GUO Tao, ZHU Hui-ren, LI Guang-chao, et al. Flow in Channel with Rib Turbulators and Double-Row Bleed Holes[J]. Journal of Propulsion Technology, 2007, 28(4): 400-402.)
[10] 倪萌, 朱惠人, 裘云, 等. 肋角度对流量系数影响的数值模拟研究[J]. 航空动力学报, 2004, 19(2):196-200.
[11] 李广超, 张魏, 朱惠人, 等. 肋角度对矩形通道壁面换热影响的研究[J]. 汽轮机技术, 2007, 49(3):203-205.
[12] Rongguang Jia, Saidi A, Sunden B. Heat Transfer Enhancement in Square Ducts with V-Shaped Ribs[J]. Journal of Turbomachinery, 2002, 125(4): 469-476.
[13] 张艾萍, 毕帅, 付磊. 基于内置V型肋片的直通道内流动与传热的数值研究[J]. 热能动力工程, 2015, 30(2): 205-211.
[14] 李建华, 宋双文, 杨卫华, 等. 不同结构肋化通道对流换热特性的试验[J]. 航空动力学报, 2007, 22 (10): 1663-1666.
[15] 徐国强, 王梦, 陶智, 等. 矩形通道中亚尺度肋片的流动换热数值分析[J]. 北京航空航天大学学报, 2007, 33(11): 1281-1285.
[16] 张勃, 张靖周, 吉洪湖, 等. 网格式内冷通道换热与流阻特性实验研究[C]. 济南:中国工程热物理学会传热传质学学术会议, 2002.
[17] 张勃, 吉洪湖, 张靖周, 等. 网格式肋化通道换热与总压损失特性研究[J]. 航空动力学报, 2004, 19(2): 201-205.
[18] Ozceyhan V, Gunes S. Heat Transfer Enhancement in a Tube Using Triangular Ribs[R]. ASME HT 2008-56075.
[19] Fouladi F, Henshaw P F, Ting S K. Effect of a Triangular Rib on a Flat Plate Boundary Layer[J]. Journal of Fluids Engineering, 2016, 138(1): 1-15.
[20] 甄永杰, 刘振义, 师晋生, 等. 三角形肋片非稳态导热数值模拟[J]. 节能, 2005, (7):18-20.
[21] Han J C, Huang J J, Lee C P. Augmented Heat Transfer in Square Channels with Wedge-Shaped and Delta-shaped Turbulence Promoters[J]. Journal of Enhanced Heat Transfer, 1993, 1(1): 37-52.(编辑:史亚红)　　　　　　　　　　　　　　收稿日期:2017-09-25；修订日期:2018-01-05。通讯作者:郭涛,男,博士,高级工程师,研究领域为发动机热端部件传热及高效冷却技术等。E-mail: guotao@nwpu.edu.cn