某燃气轮机高温涡轮盘的破裂转速数值预测方法研究与试验验证

为确定某燃气轮机涡轮盘的破裂转速，设计并开展了轮盘破裂转速试验，得到了其真实破裂转速，并与多种数值预测方法预测的轮盘破裂转速进行对比。结果表明：对于某型燃气轮机高温涡轮盘而言，最大应力法对破裂转速的预测精度最高，与试验转速相比，精度误差为0.9%，可以预测裂纹的起始开裂位置以及轮盘的破裂模式；极限应变法与残余变形法预测的破裂转速的精度相当，与试验转速相比，精度误差分别为4.8%和6.2%，由于有限元方法会同时计算应变和应力，因此建议优先选用应力准则预测；平均周向应力法计算相比较简便，计算时间短，但是精度较差，精度约为12.3%，可以用于粗略估计破裂转速。

Numerical Prediction Method and Test Verification for Burst Speed of High Temperature Turbine Disk of Gas Turbine

In order to determine the burst speed of the turbine disk of a certain gas turbine,the real burst speed was obtained by designing and carrying out the burst speed test of turbine disk,which was compared with the burst speed of turbine disk predicted by various numerical prediction methods.The research results show that for high temperature turbine disk of a certain gas turbine,the maximum stress method has the highest prediction accuracy for the burst speed,the accuracy error is 0.9% compared with the test speed,the initial crack position and the burst mode of the disk can be predicted; The accuracy of the burst speed predicted by the ultimate strain method is similar to that of the residual deformation method,the accuracies are 4.8% and 6.2% respectively compared with the test speed.Because the strain and stress can be calculated simultaneously by the finite element method,it is recommended to choose the stress criterion to predict preferentially.The average circumferential stress method is relatively simple to calculate,the calculation time is short,but the accuracy is worse,the accuracy error is about 12.3%,which can be used to roughly estimate the burst speed.