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以1 000MW超超临界汽轮机高压外缸为研究对象,通过引入Norton-Bailey材料蠕变本构方程和Cocks-Ashby多轴韧度系数,对汽缸轴对称二维模型的温度场、应力场和CA蠕变等效应变分布进行了计算,找出了结构设计中不合理区域并提出相应的结构改进方案.结果表明:经改进的高压外缸结构设计是合理的;CA蠕变等效应变计算结果均小于推荐考核标准,该1 000MW超超临界汽轮机高压外缸的高温蠕变应变强度能够满足设计要求.
Taking the 1 000MW ultra-supercritical turbine high-pressure outer cylinder as the research object, by introducing the creep constitutive equation of Norton-Bailey material and Cocks-Ashby multi-axis toughness coefficient, the temperature field, stress field and CA Creep equivalent strain distribution is calculated and the irrational region in structural design is found out and the corresponding structural improvement plan is proposed.The results show that the design of the improved high pressure outer cylinder structure is reasonable and the calculation result of CA creep equivalent strain Are less than the recommended test standards, the high-temperature creep strain strength of the high-pressure outer cylinder of the 1 000 MW ultra-supercritical turbine can meet the design requirements.