The latter lies in an excessive pre-twisted angle of the originally designed blade shrouds,a relatively small fillet radius R at the blade shroud concave and improper assembly procedures.

• 采用静力学、动力学计算方法对某型工业燃气轮机低压涡轮带冠动叶掉角故障进行了分析,得出了叶冠产生掉角的主要原因是:原设计叶冠的预扭角过大、叶冠凹口处的转接R小及装配工艺不良所致。