非定常工况下翼型熵产特性数值研究  

Numerical study on entropy generation characteristic of airfoil under unsteady condition

作　　者：王威 王军[1] 丁炎炎 尹国庆 WANG Wei;WANG Jun;DING Yanyan;YIN Guoqing(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2020年第11期120-125,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重点研发计划资助项目(2018YFB0606101)。

摘　　要：基于多驰豫格子玻尔兹曼方法,对低雷诺数下二维翼型非定常状态下的熵产特性进行分析研究.为了提高计算准确性,采用分块网格细化算法对流场变化剧烈区域进行加密,并采用插值反弹格式处理曲线边界.通过对雷诺数为1000时不同攻角下翼型绕流的数值模拟,计算翼型的阻力与熵产率验证了该算法的有效性.通过计算不同攻角、不同相对厚度翼型的非定常熵产率,研究翼型涡脱落与流动损失的关系.研究结果表明:非定常流动时,翼型的阻力与流场的熵产率不再满足相关性,流场熵产的非定常性主要是由主分离涡和尾缘脱落涡的相互作用导致,当主分离涡向尾缘运动而尾缘分离涡逐渐脱落时,熵产逐渐减小;而当尾缘分离涡推动主分离涡向前缘运动时,熵产逐渐增大.The entropy generation characteristics of two-dimensional airfoil at low Reynolds number under unsteady condition was studied based on multiple-relaxation-time lattice Boltzmann method.To improve the accuracy of calculation,the block mesh refinement algorithm was adopted for encryption in parts of the domain characterized by complex flow,and the interpolated bounce-back method was used to treat the curve bound.The effectiveness of the algorithm was verified through the numerical simulation of airfoil flow at different angles of attack when Re=1 000 and by calculating drag force and entropy generation rate of airfoils.The relationship between airfoil vortex shedding and flow loss was studied by calculating unsteady entropy generation rate of airfoils with different angles of attack and relative thickness.Research results show that the entropy generation rate and the drag force are nonlinearly related for unsteady condition.The unsteadiness of entropy generation is mainly caused by the interaction between the main separation vortex and the trailing shedding vortex.When the main separation vortex moves toward the trailing edge and the trailing shedding vortex gradually sheds,the entropy generation rate decreases.When the trailing shedding vortex pushes the main separation vortex to move forward,the entropy generation rate increases.

关 键 词：格子玻尔兹曼方法 翼型绕流 非定常 熵产 阻力 

分 类 号：V221.3[航空宇航科学与技术—飞行器设计]