Numerical simulation of effect of Gurney flap on performance of circular arc airfoil
ZHOU Xin, ZHENG Yuan2, LI Dongkuo1, JIANG Wenqing1
1.Colloge of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2.National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Nanjing, Jiangsu 210098, China
Abstract：To study influences of Gurney flap on aerodynamic behavior of circular arc airfoil, Fluent software was used to simulate air flows around an ordinary airfoil and an airfoil with a Gurney flap in different heights. The principle of lift enhancement of Gurney flap was studied by comparing the difference in their aerodynamic performance at various angles of attack and by analyzing the change in flow field around them. The results demonstrate that Gurney flap improves the distribution of flow field around the circular arc airfoil and its lift has been significantly raised, further the higher the flap height is, the more the lift increases. Its drag decreases a little at small angles of attack and increases at big angles of attack. Under the influence of both lift and drag, the lift-drag ratio of airfoil has been effectively improved at small angles of attack, and the Gurney flap with a height of 2% chord length has the best performance. The appeared Karman vortex and corner vortex in the flow field around the airfoil are the key factors for lift enhancement of Gurney flap.
[1]LIEBECK R H. Design of subsonic airfoils for high lift[J]. Journal of aircraft, 1978, 15(9):547-561.[2]TRAUB L W, MILLER A, REDINIOTIS O. Preliminary parametric study of Gurney flap dependencies[J]. Journal of aircraft, 2006, 43(4):1242-1244.[3]LI Y, WANG J, ZHANG P. Effect of Gurney flaps on a NACA0012 airfoil[J]. Flow turbulence & combustion, 2002, 68(1):27-39.[4]XIAO Tao,Daichin. The experimental study of aerodynamics and flow structures of a wing with Gurney flaps in ground effect[J]. ACTA aerodynamica sinica, 2013, 31(5): 572-578.[5]MYOSE R, PAPADAKIS M, HERON I. Gurney flap experiments on airfoils, wings, and reflection plane model[J]. Journal of aircraft, 1998, 35(2):206-211.[6]周丹. 大功率风力机叶片模态及气动特性分析[J]. 流体机械, 2015,43(12):33-36. ZHOU Dan. Analysis of modal and aerodynamic of high-power wind turbine blade[J]. Fluid machinery, 2015,43(12):33-36.(in Chinese)[7]崔钊,李建波, 赵洪.小展弦比机翼加装Gurney襟翼的低雷诺数试验[J]. 航空动力学报,2014, 29(3):637-644. CUI Zhao, LI Jianbo, ZHAO Hong. Test of low aspect ratio wing equipped with Gurney flaps at low Reynolds numbers[J].Journal of aerospace power, 2014, 29(3):637-644.(in Chinese)[8]WANG J J, LI Y C, CHOI K S. Gurney flap—lift enhancement, mechanisms and applications[J]. Progress in aerospace sciences, 2008, 44(1):22-47.[9]谭磊, 曹树良. 基于滤波器湍流模型的水翼空化数值模拟[J]. 江苏大学学报(自然科学版), 2010,31(6):683-686. TAN Lei,CAO Shuliang. Numerical simulation of hydrofoil cavitation based on filter-based model[J].Journal of Jiangsu University(natural science edition), 2010, 31(6):683-686.(in Chinese)[10]旷海洋. Gurney 襟翼对风力机叶片气动性能影响的数值模拟研究[D].兰州:兰州理工大学,2012.[11]张艳,何伟军. 我国小型风力发电产业发展现状及前景研究[J]. 科技和产业,2013,13(1):1-4. ZHANG Yan, HE Weijun. Research on the development present situation and prospect of small wind power industry in China[J]. Science technology and industry, 2013, 13(1):1-4.(in Chinese)[12] 任岩,毕亚雄,王德宽,等. 风电机组传动链的故障树智能诊断技术[J]. 排灌机械工程学报, 2016, 34(4): 328-331. REN Yan,BI Yaxiong,WANG Dekuan,et al. Fault tree intelligent diagnosis technology for wind turbine drivetrain[J]. Journal of drainage and irrigation machinery engineering, 2016, 34(4): 328-331.(in Chinese)[13]高永卫, 马玉清, 罗凯,等. 圆弧板翼型小雷诺数气动特性计算研究[J]. 风机技术,2010(1):19-21. GAO Yongwei, MA Yuqing, LUO Kai,et al. Research on aerodynamic characteristics of circular arc airfoil under small Reynolds numbers[J].Compressor blower & fan technology,2010(1):19-21.(in Chinese)[14]汪礼. 常用湍流模型适用性分析及翼型VOF数值模拟[D].武汉:华中科技大学, 2007.[15]LAMPINEN M J, KOTIAHO V W, EI H A M. Application of axial fan theory to horizontal-axis wind turbine[J]. International journal of energy research, 2006, 30(13):1093-1107.[16]申振华,于国亮. Gurney襟翼对水平轴风力机性能影响的实验研究[J].太阳能学报, 2007, 28(2):196-199. SHEN Zhenhua,YU Guoliang. Experimental investigation of effect of Gurney flap on performance of horizontal-axis wind turbine [J]. Acta energiae solaris sinica,2007, 28(2):196-199.(in Chinese)
