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本文用弹塑性有限元素法,计算了上汽厂30万千瓦汽轮机转子最危险截面——高压缸调节级后转子过渡圆角处的热应力集中系数,并作出了该截面过渡圆弧与热应力集中系数的关系曲线,从而给该机组改型设计提供了可靠的设计依据。按本文计算的结果,只要把30万千瓦汽轮机高压转子的过渡圆弧从R3改为R20,热应力集中系数即能降低25％左右,而转子寿命可延长两倍左右,这无疑是一个很大的改进。计算中采用了转子真实材料的应变应力由线,因而数据更为可靠。另外,汽封弹性槽经过改进后,热应力集中系数下降18％,这对汽轮机的启动性能带来极大的好处。
In this paper, with the elasto-plastic finite element method, the thermal stress concentration coefficient at the transition corner of the rotor of the steam turbine rotor with the most dangerous cross section of 300 MW was obtained. The transitional arc and thermal stress concentration Coefficient of the relationship between the curve, thus giving the unit retrofit design provides a reliable design basis. According to the results of this paper, as long as the transition arc of the high-pressure rotor of a 300MW turbine is changed from R3 to R20, the thermal stress concentration factor can be reduced by about 25%, while the rotor life can be extended by about two times. This is undoubtedly a very large improvement of. In the calculation, the strain stress of the real material of the rotor is taken by the line, so the data is more reliable. In addition, the gland elastic groove has been improved, the thermal stress concentration factor decreased by 18%, which brings great benefits to the turbine starting performance.