| LI Xiao-qing， MENG De-jun， YIN Song.Component Matching Analysis of Variable Cycle Compression System Based on 3D Numerical Simulation[J].航空发动机,2024,50(3):40-46 |
| Component Matching Analysis of Variable Cycle Compression System Based on 3D Numerical Simulation |
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| Key Words:variable cycle fan high pressure compressor throttling characteristics bypass ratio performance matching numerical
simulation aeroengine |
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| Abstract:In order to study the component matching of a variable cycle compression system and its performance during whole engine
operation and adjustment, joint simulation of the fan, CDFS, compressor, and bypass duct of a variable cycle engine was carried out by
using 3D numerical tools. The differences between numerical calculation and experimental results were compared. The core-flow throttling
characteristics and bypass-flow throttling characteristics were investigated for the single and double bypass mode. The changes in
component matching relationships caused by core and bypass outlet pressure regulation were analyzed. The variation range of the bypass
ratio and flow characteristics of each component under limit regulation conditions were derived. The key components that constrain the
surge margin of the whole compression system were identified. The results show that in double bypass mode, bypass throttling leads to a
significant increase in the fan operating point, causing the fan to first reach the surge boundary; while under single bypass mode, bypass
throttling leads to a simultaneous increase to the operating points of the fan and the CDFS, causing them to reach the surge boundary almost
simultaneously. Core flow throttling causes the high-pressure compressor to first reach the surge boundary in both single and double bypass
mode. The deviation between the numerically derived bypass loss and the experimental result is within 4%. |
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