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http://dx.doi.org/10.3795/KSME-B.2017.41.10.685

A Numerical Investigation on the Isentropic Efficiency of Steam Turbine Nozzle Stage with Different Nozzle Vane Thickness and Mass Flow Rate  

Lee, Jong Hyeon (Dept. of Mechanical Engineering, Changwon Nat'l Univ.)
Park, Hee Sung (Dept. of Mechanical Engineering, Changwon Nat'l Univ.)
Jung, Jong Yun (Dept. of Industrial & Naval Architecture & Marine Engineering, Changwon Nat'l Univ.)
Kim, Joon Seob (Jinyoung TBX Co., LTD.)
Jung, Ye Lim (Jinyoung TBX Co., LTD.)
Park, Sung Won (Jinyoung TBX Co., LTD.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.41, no.10, 2017 , pp. 685-691 More about this Journal
Abstract
In this study, the influence of mass flow rate on the isentropic efficiency of the steam turbine nozzle stage is investigated. A realistic three-dimensional numerical model, which is based on the compressible Navier-Stokes equations, is developed for the steam phase. The comprehensive conservation laws and a kinetic model for steam are investigated. With two different models for the three-dimensional geometry of the nozzle stage, the pressure and temperature distributions, velocity, Mach number. and Markov energy loss coefficient are calculated. A maximum efficiency of 96.66％ is found at a mass flow rate of 0.9 kg/s in model A. In model B, a maximum efficiency of 97.32％ is found at a rate of 1.6 kg/s. It is determined that the isentropic nozzle efficiency increases as the Markov energy loss coefficient decreases through a nearly linear relationship.
Keywords
Numerical Simulation; Steam Turbine; Nozzle; Isentropic Nozzle Efficiency;
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Times Cited By KSCI : 4  (Citation Analysis)
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