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针对现代民用飞机设计巡航阻力预测中不考虑转捩影响很难完善计算与试验对比的问题,采用固定转捩和全湍流方法完成DLR_F4翼身组合体阻力计算,并与试验及相关文献结果进行对比.结果表明:采用设置有小范围层流区的固定转捩计算与相应全湍流计算得到的压力因数分布基本一致,二者之间总阻力的差量主要表现在黏性阻力方面;在大多数迎角下,全湍流计算结果与试验比较接近,只在大迎角接近失速时,全湍流结果稍差;2种计算方式对评估带有小范围层流区风洞试验的阻力结果有积极意义.
In order to solve the cruise resistance forecast of modern civil aircraft, it is difficult to improve the calculation and experimental comparison without considering the effect of transition. The resistance of DLR_F4 wing-body assembly is calculated by the method of fixed turbulence and full turbulence, and compared with the experimental and related literatures The results show that the distribution of pressure factors calculated by the fixed turbulence with a small area of laminar flow is basically the same as that of the corresponding total turbulence, and the difference between the two is mainly in the aspect of viscous resistance. At full angle of attack, the results of full turbulent flow are close to those of the experiment, and the turbulence results are only slightly worse at high angles of attack approaching to stall. The two calculation methods are of positive significance to the evaluation of the resistance results of the wind tunnel with small-scale laminar flow .