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针对某向心涡轮,采用二维流动分析方法设计矩形截面蜗壳,同时采用商用计算流体动力学软件CFX对带蜗壳的向心涡轮流动损失进行数值计算.将计算结果与原型设计中带有集气室的向心涡轮计算结果进行对比.结果表明:蜗壳内流动损失要小于集气室内的流动损失,向心涡轮采用蜗壳后流道内流场有明显改善,效率有所提高.采用设计的矩形截面蜗壳,向心涡轮的功率提高1.7%.通过内部流场的分析,揭示了内部流场结构和损失机理,为向心涡轮的设计和优化提供了一定的参考.
For a radial turbine, a two-dimensional flow analysis method was used to design a rectangular cross-section spiral case, and the computational fluid dynamics software CFX was used to numerically calculate the radial flow loss of the turbine with a volute. The calculation results were compared with the prototype The results show that the flow loss in the volute is smaller than the flow loss in the plenum and the flow field in the flow passage of the radial turbine is obviously improved and the efficiency is improved. The design of the rectangular cross-section volute, the radial turbine power increased by 1.7% .Analysis of the internal flow field reveals the internal flow field structure and loss mechanism for the radial turbine design and optimization provides a reference.