Accession Number : ADA330080

Title :   Aerodynamic Synthesis of a Centrifugal Impeller Using CFD and Measurements.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Larosiliere, L. M. ; Skoch, G. J. ; Prahst, P. S.

PDF Url : ADA330080

Report Date : JUL 1997

Pagination or Media Count : 22

Abstract : The performance and flow structure in an unshrouded impeller of approximately 4:1 pressure ratio is synthesized on the basis of a detailed analysis of 3D viscous CFD results and aerodynamic measurements. A good data match was obtained between CFD and measurements using laser anemometry and pneumatic probes. This solidified the role of the CFD model as a reliable representation of the impeller internal flow structure and integrated performance. Results are presented showing the loss production and secondary flow structure in the impeller. The results indicate that while the overall impeller efficiency is high, the impeller shroud static pressure recovery potential is underdeveloped leading to a performance degradation in the downstream diffusing element. Thus, a case is made for a follow-on impeller parametric design study to improve the flow quality. A strategy for aerodynamic performance enhancement is outlined and an estimate of the gain in overall impeller efficiency that might be realized through improvements to the relative diffusion process is provided.

Descriptors :   *COMPUTATIONAL FLUID DYNAMICS, *CENTRIFUGAL COMPRESSORS, *IMPELLERS, MATHEMATICAL MODELS, OPTIMIZATION, AERODYNAMIC CHARACTERISTICS, SECONDARY FLOW, ROTOR BLADES(TURBOMACHINERY).

Subject Categories : Hydraulic and Pneumatic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE