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MA Wentong
LIU Yongwen
SU Ming
School of Mechanical Engineering,
Shanghai Jiaotong University,
Shanghai 200240, China
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NEW SCALING METHOD FOR COMPRESSOR MAPS
USING AVERAGE INFINITESIMAL STAGE*
Abstract:
The estimation of the precise performance of existing multistage axial-flow compressors of gas turbine engines is fast becoming a great concern, as the use of gas turbine engines in the power generation and in the military industry increases. In order to reduce the analysis performance error of the traditional scaling method, a new scaling method for estimating the characteristics of multistage axial flow compressors is proposed. This novel method is based on experimental and partial data provided by engine manufacturers. Taking the effect of density-change into account, we introduce the average infinitesimal stage concept, and thereby divide the compression process into an infinite number of infinitesimal processes corresponding to infinitesimal stages. Subsequently, we adopt the corrected Reynolds analogy method for compressible flow calculation in order to ensure much better compliance with the similarity criterion. Validation checks show that the proposed method has enough precision to predict the off-design performance characteristics of multistage axial flow compressors.
Key words:
Thermodynamic system Characteristic maps Similarity extrapolation Axial flow compressors
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