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采用3段3次贝塞尔曲线拟合叶型中弧线弯角分布,两段3次贝塞尔曲线拟合厚度分布,进行流线面造型,并结合优化算法进行寻优.S1流场评价工具为MISES软件,寻优算法为遗传算法(GA).将传统遗传算法进行改进,引入并行模块,较大程度地提高了计算效率.实现了高负荷叶型的自动优化,探讨了高负荷叶型的设计准则,并将准则应用于超声叶型设计.结果表明:相比于原始叶型,优化后的叶型Ⅰ在总压损失系数略降低和出口气流角不变的条件下,可用攻角范围拓宽约2°,叶型Ⅱ的总压损失系数明显降低,可用攻角范围拓宽约0.6°,落后角降低约3.9°.
The curvature distributions of the arcs in three types of Bezier curves are fitted by three 3-segment Bezier curves, the thickness distribution is fitted by three Bezier curves in two sections, and the streamline surface is modeled and optimized with the optimization algorithm. The evaluation tool is MISES software and the optimization algorithm is genetic algorithm (GA). The traditional genetic algorithm is improved and the parallel module is introduced to improve the computational efficiency to a great extent.Automatic optimization of high-load leaf type is realized, And the criterion is applied to the design of ultrasonic blade.The results show that compared with the original blade, the optimized model I can be used under the conditions of a slight decrease of total pressure loss coefficient and constant outlet airflow angle The range of angle of attack broadened by about 2 °, and the total pressure loss coefficient of the leaf type Ⅱ decreased obviously. The available range of angle of attack was broadened by 0.6 ° and the angle of fall was reduced by about 3.9 °.