某型倾转旋翼机的旋翼桨叶气动优化设计

倾转旋翼机的旋翼气动外形设计需要对其直升机模式和固定翼模式下的不同要求进行综合考虑。通过基于Kriging模型的多目标遗传算法建立一套适用于倾转旋翼桨叶气动外形优化设计方法,采用拉丁超立方抽样试验设计方法得到样本点,并建立Kriging模型替代费时的流动数值模拟。以最大化旋翼地面悬停拉力和高空巡航效率为目标,以地面悬停功率不增和巡航拉力不减为约束条件,进行倾转旋翼桨叶平面形状优化设计,并经过非定常数值模拟和风洞试验验证。结果表明:数值模拟结果和风洞试验结果吻合良好,优化结果满足设计指标。

Aerodynamic Optimization Design of the Rotor of Tiltrotor Aircraft

The aerodynamic design of tiltrotor must be synthetically considered to meet the different requirements between helicopter mode and fixed-wing aircraft mode, a set of optimization design methods for aerodynamic shape of tiltrotor is established by multi-objective genetic algorithm based on Kriging surrogate model. In order to improve the efficiency, the Latin hypercube method is employed to generate the initial sample points, and the Kriging surrogate model is built to replace the numerical simulation of flow. The objective function of optimization is maximum hovering thrust and cruising efficiency, with constraints of non-increasing hovering power and non-decreasing cruising thrust. The results show that, the hovering efficiency of optimized rotor is 71.0%, and the cruising efficiency of optimized rotor is 63.1%. The optimized rotor is predicted by unsteady CFD (Computational Fluid Dynamics) simulations and validated by wind tunnel test which show the good agreement between two methods. Also, the result of optimized rotor meet the design requirements and it indicates the reasonability of optimization method and numerical simulation.