重型燃气轮机铸造机匣的强度与刚度分析

摘要

High-power heavy-duty gas turbine casing generally use the forging and casting two ways to manufacture.Although cast casing can easy procession, installation and low cost, as temperature great affect its wall thickness, so cast casing was less used at equipment even its weight and size without have especially requirements.Based on considering the impact of temperature factor, the finite element strength and stiffness analysis of high-power heavy-duty gas turbine cast casing was analysed under combination loads, which constituted by rotor gravity, stator blade row axial force and torque,aerodynamic force, gas pressure and thermal expansion force, and the conclusions obtained:the temperature is an important impact factor affecting the casing strength and stiffness, and the maximum stress and strain generated at casing by combination loads considering the impact of temperature, but its value still in a reasonable range.Analysis methods and calculate results are references for similar devices design and manufacture.%大功率重型燃气轮机机匣一般采用锻造和铸造两种方法制造.铸造机匣虽加工较易、安装简便、造价较低,但因其壁厚受温度因素影响大,所以即使在对设备重量和体积无特别要求时也少被采用.在考虑温度因素影响的基础上,对某重型燃气轮机铸造机匣受转子重力、静子叶片排的轴向力和扭矩、气动力、气压力和热膨胀力等组合载荷作用时的强度和刚度进行了有限元分析,并得出如下结论:温度因素的确是影响铸造机匣强度和刚度的重要因素,在考虑温度影响的情况下,机匣受组合载荷作用产生的应力和应变均达到最大值,但仍在合理的范围之内.分析方法和计算结果可供同类设备设计研制时借鉴和参考.