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http://dx.doi.org/10.5293/KFMA.2007.10.4.029

Numerical Analysis Techniques and Flow Characteristics of Two-Stage Centrifugal Compressor for R134a Turbo-Chiller  

Park, Han-Young (고려대학교 기계공학과 대학원)
Oh, Hyun-Taek (고려대학교 기계공학과 대학원)
Shin, You-Hwan (한국과학기술연구원 열 유동제어연구센터)
Lee, Yoon-Pyo (한국과학기술연구원 열 유동제어연구센터)
Kim, Kwang-Ho (한국과학기술연구원 열 유동제어연구센터)
Chung, Jin-Taek (고려대학교 기계공학과)
Publication Information
The KSFM Journal of Fluid Machinery / v.10, no.4, 2007 , pp. 29-38 More about this Journal
Abstract
In this study, flow structure in a two-stage centrifugal compressor for a turbo-chiller with the refrigerant, R134a, was numerically investigated at the design point of the compressor using a commercial code. Flow characteristics in the passages of impeller, diffuser and return channel were analyzed in detail including velocity vector, secondary flow, Mach number and pressure contours in blade spanwise and meridional plane for each stage. The estimation on the one-dimensional output from the preliminary design and three-dimensional shape of the impeller blade and the meridional shape of the return channel were performed through the flow analysis, while some numerical schemes and techniques including Multiple Frames of Reference technique, real gas property data and inlet boundary condition changes, which were used in CFD, were compared with their features. The results will be used as reference data for a new design of 3-D impeller shape to improve R134a compressor performance.
Keywords
CFD; HFC-134a; Turbo-Chiller; Two-Stage Centrifugal Compressor;
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