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http://dx.doi.org/10.6108/KSPE.2018.22.2.020

Meanline Analysis Method for Performance Analysis of a Multi-stage Axial Turbine in Choking Region  

Kim, Sangjo (Gas Turbine System Integration Team, Doosan Heavy Industries and Construction Co., Ltd.)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.22, no.2, 2018 , pp. 20-28 More about this Journal
Abstract
In general, the choking phenomenon occurs due to the flow acceleration of a turbine under high pressure-ratio. During choking, the total pressure ratio increases without any variation in the mass flow rate. It is difficult to predict choking characteristics by using conventional meanline analysis, which utilizes mass flow inlet boundary condition. In this study, an algorithm for predicting the choking point is developed to solve this problem. In addition, a performance estimation algorithm is presented to estimate the performance after choking, based on the flow behavior of flow expansion at the choked nozzle or rotor. The analysis results are compared with 3D CFD analysis and experimental data to validate this method.
Keywords
Multi-stage; Axial Turbine; Choking; Meanline Analysis; Off-design Performance;
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