涵道比调节对核心机驱动风扇级与高压压气机匹配性能影响

马昌友; 侯敏杰; 幸晓龙

doi:10.13224/j.cnki.jasp.2018.02.017

涵道比调节对核心机驱动风扇级与高压压气机匹配性能影响

doi: 10.13224/j.cnki.jasp.2018.02.017

中国航空发动机集团有限公司四川燃气涡轮研究院航空发动机高空模拟技术重点实验室,四川绵阳 621000

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出版历程
- 收稿日期: 2017-04-19
- 刊出日期: 2018-02-28

Effects of bypass ratio on the matching performance between core driven fan stage and high pressure compressor

摘要

摘要: 根据某核心机驱动风扇级与高压压气机匹配气动布局的特点,建立了匹配状态点关联预估简化方程并发展了匹配性能预估程序。基于两个压缩部件性能试验数据,进行了典型匹配状态涵道比预估及特点分析,研究了等转速下涵道比调节对两个压缩部件工作状态点变化规律以及匹配性能影响。结果表明:(1)涵道比设置不合理将会导致压缩部件发生旋转失速或喘振现象,从而影响两者的匹配工作；(2)随着涵道比增大,核心机驱动风扇级工况点逐渐从近喘点向堵塞点方向偏移,而高压压气机的工况点变化趋势正好相反。核心机驱动风扇级的流量变化范围比高压压气机的窄,这使得匹配总压比-流量特性线更加陡峭；(3)存在最佳匹配涵道比使稳定工作裕度和近失速边界匹配总压比达到最大,并且此时的匹配峰值总效率接近最大匹配峰值总效率；(4)随着匹配转速的提高,典型匹配涵道比呈现逐渐减小趋势,外涵流量在85%换算转速时达到最大,因此在进行外涵流道设计需全面考虑压气机的工作特性。
- 变循环 /
- 核心压气机 /
- 核心机驱动风扇级 /
- 涵道比 /
- 匹配性能
Abstract: A prediction equation and the related prediction program were developed according to the aerodynamic matching between core driven fan stage(CDFS) and high pressure compressor (HPC). Through the experimental data of CDFS and HPC, typical matching bypass ratio prediction and characteristic analysis were carried out. The effect of bypass ratio change on the matching performance and their respectively working conditions were discussed. The four following conclusions were drawn: (1) The right bypass ratio should be set to ensure the normal operation of CDFS, HPC and their matching. (2) With the increase of bypass ratio, CDFSs working condition moves from the near stall point to the near choke point, and HPC does in the opposite way. As the working range of CDFS is smaller than that of HPC, the matching massflow-total pressure ratio performance curve is very steep. (3) There exists an optimum bypass ratio that the matching can have the maximum stall margin, total pressure ratio at the near stall condition and the peak efficiency. (4) With the increase of rotating speed, typical matching bypass ratio decreases. Flow through the bypass at 85% corrected rotating speed reaches the maximum, so the bypass flow capacity cannot be designed without the design parameter of the matching between CDFS and HPC.
- variable cycle /
- core compressor /
- core driven fan stage(CDFS) /
- bypass ratio /
- matching performance

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