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通过设置涡核模型的角度条件,使涡核模型在极限状态下仍保持收敛,进而改进了利用Biot-Savart定律计算直线涡元对空间任意一点诱导速度的模型;桨叶气动模型采用Weissinger-L升力面理论模拟;自由尾迹的求解采用PIPC松弛迭代算法结合具有二阶精度的CB2D时间步进算法.利用上述模型和算法对某型号旋翼的尾迹进行数值计算,结果显示:利用改进涡核模型计算的桨尖涡径向位移收缩更加明显,这与实际情况更加接近;利用改进涡核模型得到的自由尾迹结果与实验数据吻合的更好.上述结论可以证明,新建立的旋翼自由尾迹模型提高了原有模型的准确性.
By setting the eddy-core model’s angle conditions, the model of the core-vortex core converges under the limit condition, and then the Biot-Savart law is used to calculate the model of the linear vortex element induced velocity at any point in space. The aerodynamic model of the blade is simulated by Weissinger-L The lift surface theory is simulated.The free wake is solved by the PIPC relaxation iteration algorithm combined with the CB2D time stepping algorithm with second order precision.The numerical simulation of the wake of a model rotor is carried out by the above models and algorithms.The results show that by using the improved turbulence model , The radial displacement of blade tip vortex contracts more obviously, which is more close to the actual situation.The free-wake result obtained by the modified vortex core model is in good agreement with the experimental data.The above conclusion can prove that the newly established free-wake model of rotor improves The accuracy of the original model.