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“主油泵-油涡轮增压泵”型式的油系统已广泛应用于600 MW及以上等级大型汽轮机组。根据油涡轮各部件流道几何特点、工作原理及系统对于油涡轮流体动力性能要求,在一定假设条件下推导出油涡轮设计过程中主要几何参数与外特性的关系方程。结合某1 000 MW汽轮机组油系统研制要求设计出了两个油涡轮方案,采用CFD软件进行多方案、多工况数值模拟和性能预测,揭示了所推导出的流道几何参数对油涡轮流体动力性能影响关系。通过油系统试验获得了两个方案的外特性,验证性能预测的可靠性,进一步证明分析方法的可行性,为完善这类油涡轮的设计方法奠定了一些基础。
“The main oil pump - oil turbocharger ” type of oil system has been widely used in large-scale steam turbine 600 MW and above. According to the geometrical characteristics, operating principle and system fluid dynamic performance requirements of each component of oil turbine, the relationship equation between the main geometric parameters and the external characteristics of the oil turbine is deduced under certain assumptions. Two oil turbine schemes were designed according to the development requirements of a 1 000 MW steam turbine oil system. The CFD software was used to simulate and predict the performance of multi-scheme and multi-working conditions. It was revealed that the geometrical parameters of the runner had a significant influence on the oil turbine fluid Dynamic performance affects the relationship. Through the oil system test, the external characteristics of the two schemes are obtained, the reliability of the performance prediction is verified, the feasibility of the analysis method is further proved, and the basis for improving the design methods of such oil turbines is established.