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为研究襟翼偏转对翼伞气动性能的影响,对不同襟翼偏转情况分别建立CFD模型,通过有限体积法进行空间离散并求解RANS方程,模拟翼伞在转向与雀降阶段的气动性能,进而结合最小二乘法进行参数辨识,实现翼伞气动模型的修正.模拟结果表明:襟翼偏转会引起翼伞压强分布改变,失速迎角减小,升阻力系数突增,对翼伞气动性能造成复杂的影响;修正的翼伞气动模型可以较好描述翼伞气动性能与襟翼偏转的变化规律,相比传统气动模型有效地提高了计算精度,为翼伞在转向与雀降阶段的精确建模提供参考.
In order to study the influence of flap deflections on the aerodynamic performance of wing umbrellas, the CFD model is established for different flaps deflection. The finite volume method is used to discretize the space and solve the RANS equation to simulate the aerodynamic performance of the wing parachutes during the steering and bird drop stages. The parameters of wing parachute are identified by least-square method, and the aerodynamic model of parafoil is corrected. The simulation results show that deflection of wing flap causes the variation of parafoil pressure distribution, decreases the angle of attack and attack, and causes sudden increase of drag coefficient. The modified aerodynamic model of wing parafoil can better describe the aerodynamic performance of wing parachute and the variation rule of flap deflection. Compared with the traditional aerodynamic model, the aerodynamic model can effectively improve the accuracy of the calculation. for reference.