基于快速预测模型的轮盘瞬态变形影响

Transient Deformations of Turbine Rotor based on a Reduced Prediction Method

针对初始设计阶段预测轮盘变形需要,发展了一种基于有限体积法的航空发动机轮盘瞬态变形快速计算方法,在Matlab平台编制了预测代码,利用该方法模拟了单轴发动机瞬态加速中的涡轮盘热浸润过程以及轮盘变形响应。模拟结果表明:采用该方法可较好地预测结果,适用于航空发动机方案设计。参数影响分析表明:换热系数以及时间间隔影响轮盘温度水平, 高热传导率降低了径向温度梯度, 初始温度对于盘心及中部温度有决定作用, 与等厚轮盘相比,典型轮盘剖面能降低应力水平。特定条件下的变形预测结果表明:不同因素有不同程度影响,其中初始温度影响最大,可导致65%偏差, 对流换热系数以及计算时间间隔的影响约为10%, 采用等厚轮盘或假设恒定的材料属性,变形预测结果分别增大8.8%和8.3%。

In order too predict disc deformations in preliminary design,a reduced method based on finite volume method was proposed,and the prediction code was prepared in Mat-lab platform.The method was used to simulate the heat soakage processes and transient deformations of turbine disc in the transient acceleration of a single shaft engine.Analyses indicated that the method was promising and adaptable.Results indicate that different parameters have different influences.The temperature level of the disc was influenced by heat transfer coefficient and time interval.The radial thermal gradient was flattened by high thermal conductivity,while initial temperature determined the centre and middle temperature of the disc.A well-designed profile could lower the stresses significantly compared to a disc with uniform width.The results of the deformation predictions under specific conditions show that different factors have different influence.Initial temperature result in maximum of 65%deviation,while heat transfer coefficient and time interval lead to 10%change.For a disc with a uniform width or constant material properties,the prediction results of derofmations are increased by 8.8%and 8.3%.