Numerical Analysis for the Matching of the Core Driven Compression System in a Double Bypass Engine
The numerical analysis for the matching of the core driven compression system in a double bypass variable cycle engine is presented in this paper. The system consists of a one-stage-core driven fan stage (CDFS), an inner bypass duct and a five-stage high pressure compressor (HPC), providing two basic operating modes: the single bypass mode and the double bypass mode. Variable vanes are necessary to realize the mode switch of the system. The correct matching in the double bypass mode requires a proper combination of the mass flow, total pressure ratio and blade speed. The work capacity of the system decreases in the double bypass mode and the pressure ratio tends to decrease more for the CDFS and the front stages of the HPC. The overall system efficiency is higher in the double bypass mode. The radial distributions of aerodynamic parameters are similar in different modes. The notable redistribution of mass flow downstream the CDFS in the single bypass mode leads to strong radial flows and additional mixing losses. The absolute flow angles into the inner bypass increase for the inner span and decrease for the outer span when the system is switched from the single bypass mode to the double bypass mode.
numerical analysis aerodynamic double bypass variable cysle engine core driven compression system core driven fan stage operating mode matching
ZHANG Xin LIU Bao-jie
National Key Laboratory of Science and Technology on Aero-Engines, School of Jet Propulsion Beihang University Beijing, China
国际会议
The 3rd International Symposium on Jet Propulsion and Power Engineering(第三届喷气推进与动力工程国际会议 ISJPPE)
南京
英文
249-256
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）