论文部分内容阅读
针对有限地面对旋翼产生的地面效应现象,建立了一种新的流场分析模型。根据有限地面效应问题计算量大、对旋翼流场影响不均匀的特点,使用3阶精度、高稳定性的时间步进自由尾迹格式对旋翼尾迹结构进行分析,并提出了“物质线”修正法对穿过有限地面的非物理运动尾迹节点进行了位置修正。同时开展了有限地面效应中悬停和前飞状态下的旋翼气动力测量试验,对该状态下的旋翼力和桨叶挥舞运动特点进行了测量。将新建立模型的计算结果与试验值进行对比,验证了模型的准确性。根据计算模型得到的旋翼尾迹结构,对有限地面效应中多种飞行状态下的旋翼流场进行了分析。
Aiming at the limited ground effect caused by rotor, a new flow field analysis model is established. According to the characteristics of large computational load of limited ground effect and uneven influence on the flow field of the rotor, the rotor wake structure of the rotor is analyzed by time stepping free wake format with the third order precision and high stability. The “material line” Correction method for the non-physical movement through a limited ground wake node location correction. At the same time, the rotor aerodynamic test was carried out under the condition of hovering and pre-flying in finite ground effect, and the characteristics of rotor force and blade waving in this condition were measured. The results of the new model are compared with the experimental values to verify the accuracy of the model. According to the rotor wake structure obtained from the computational model, the rotor flow field under various flight conditions in finite ground effect is analyzed.