一种航空发动机轮盘尺寸与重量预估方法

为了在航空发动机总体设计阶段准确快速的预估轮盘转子的重量,正确把握轮盘结构形式的发展趋势,建立基于等强度型面的轮盘尺寸设计和重量预估模型并开发计算程序,利用程序对某型涡扇发动机的轮盘转子进行重量预估,研究在不同轮盘中心孔半径、不同叶片应力参数(AN2)值下的轮盘尺寸和重量的变化规律,研究轮盘重量在不同轮盘中心孔半径、不同AN2值下随转子叶片材料的变化。结果表明:在满足一定的强度负荷限制和结构限制的条件下,存在轮盘应力和轮盘中心孔半径的最优组合,使得轮盘重量最小;转子叶片采用密度更小的新材料后,轮盘的中心孔半径增大,进而可能演化为叶环结构,转子部件重量大幅下降。

A Method of Size and Weight Estimation of Turbine Engine Disk

In order to estimate the disk weight quickly and accurately and to grasp the development trend of the disk structure correctly at the conceptual design stage of new aircraft engines, the model based on equal strength profile and corresponding program for evaluation of disk size and weight is set up. A turbofan engine disk is estimated with the program mentioned above. It is studied that the disk size and weight change with the radius of the center bore and the value of AN2 of the rotor blade. In addition, it is also studied that the disk size and weight change with the replacement of the rotor blade material at different radius of center bore and different values of AN2. The results show that there exists an optimum combination of disk stress and the radius of the center bore to get the minimum disk weight under limits of strength load and structure. With the new material of lower density for blade, the radius of the center bore of the disk will increase so that the rotor structure becomes bling, its weight dropped significantly.