Numerical computation of S2 flow through impeller of radial-flow gas turbine

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Numerical computation of S2 flow through impeller of radial-flow gas turbine

 

Author: Wong, Kwok-wai
Title: Numerical computation of S2 flow through impeller of radial-flow gas turbine
Year: 1999
Subject: Gas-turbines
Impellers
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Mechanical Engineering
Pages: vi, 98 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1532191
URI: http://theses.lib.polyu.edu.hk/handle/200/1969
Abstract: In this dissertation, a computer program has been developed using the quasi-three-dimensional numerical analysis to determine the flow velocity distribution and streamlines distribution inside the impeller of a radial-flow gas turbine. This will help the designer in impeller blade design. The design and analysis of turbomachinery components is a difficult task. The geometries are often complicated and the flow is difficult to determine and to predict. In conventional design of impeller blade and analysis of flow through the impeller, the profile of the impeller blade has been greatly simplified to be an arc and the flow passage was assumed to be one-dimensional. This simplification may be good enough for educational purposes, but for actual turbomachinery design, this may lead to significant deviation from the actual performance. Thus the design of impeller blade profile and the analysis of the flow become the essential parts in the development of high performance turbomachinery. In this dissertation, the governing equations were simplified appropriately and the flow is assumed steady, inviscid, adiabetic or isentropic, shock-free. A three-dimensional flow calculations in a radial-flow gas turbine will be developed by using the quasi-three-dimensional flow analysis method. In a quasi-three-dimensional calculation, the three-dimensional flow field is approximated by two interacting families of stream surfaces S1 and S2. This method incorporates some three-dimensionality while retaining the simplicity of the two-dimensional computational methods.

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