冷却蒸汽进口总压对转子冷却效果影响的数值分析  

Numerical Analysis of the Influence of the Cooling-steam Inlet Total Pressure on Rotor Cooling Effectiveness

作　　者：吕智强 周逊[2] 刘顺隆[1] 

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001 [2]哈尔滨工业大学能源科学与动力工程学院,黑龙江哈尔滨150001

出　　处：《热能动力工程》2010年第1期25-29,118-119,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：在不同冷汽进口总压条件下对超超临界汽轮机中压第一级进行了数值模拟,考察了冷却通道以及主流道内的流动状况,并对动叶表面以及叶根表面的温度场进行了研究。研究结果表明,对应所给出的最大与最小进口总压,冷却蒸汽对动叶吸力面的影响范围相差约10%的相对叶高,而叶根表面的最大温度仅相差0.6K左右。冷汽进口总压越大,冷却效果越好,但是冷汽对主流的干扰越强,将引起流动效率下降,因此,最佳冷汽进口总压的选取要综合考虑冷却效果和流动效率。At various cooling-steam inlet total pressures,a numerical simulation was performed of the IP (Intermediate Pressure) No.1 stage of an ultra-supercritical steam turbine with the flow state in both the cooling path and the main flow passage being investigated. Moreover,the temperature field of the rotating blade surface and blade root surface was also studied. The research results show that corresponding to the given maximum and minimum inlet total pressures,the difference of the areas on the rotating blade suction surface being influenced by the cooling steam is about 10% of a relative blade height,while that of the maximum temperature difference on the blade root surface,only around 0.6 K. The higher the inlet total pressure of the cooling steam,the better the cooling effectiveness. The interference of the cooling steam to the main stream,however,is also stronger,leading to a drop of the flow efficiency. Consequently,the optimum cooling steam inlet total pressure should be chosen by taking a comprehensive consideration of the cooling effectiveness and flow efficiency.

关 键 词：冷却蒸汽 总压 转子 数值模拟 

分 类 号：TK264.1[动力工程及工程热物理—动力机械及工程]