摘要
风扇转子带冠可有效抑制弯掠叶片振动,但随着转子进口马赫数的不断提高,带冠结构对风扇流场及气动性能产生显著影响。本文基于叶尖风扇构型,选取某高负荷两级风扇为研究对象,结合单通道三维数值模拟,在设计转速工况下,分析了第2级转子带冠后对风扇工作特性的影响机理及规律,并探索了转子叶片积叠线和冠体型线优化对带冠转子性能的改善效果。计算结果表明:带冠转子所引起的进口相对马赫数变化,会引起叶顶端区流动恶化,出现大面积分离区域,导致风扇的稳定工作压比、效率和裕度都显著降低;带冠转子采用周向正弯的积叠线分布以及局部弯曲的冠体型线后,在设计转速各工况下有效抑制了叶顶端区分离流动,带冠转子工作性能相比于改进前得到明显改善,压比升高5.0%,效率提高1.6%,裕度提升5.3%。
Rotor with tip ring suppresses the swept and curved blade flutter effectively,but also has significant influence on the flow structure and fan performance with the Mach number at rotor inlet increase.Considering the FLADE(Fan on blade)configuration,the mechanism of the second rotor with tip ring on the fan performance at designed rotation speed is investigated based on the three dimensional simulations of a single channel of a two stage high loaded fan.It is also evaluated the improvement effects of rotor blade stacking and tip ring profile on the rotor with tip ring performance.The numerical results show that the decreased relative Mach number at rotor inlet induced by tip ring deteriorates the tip corner flow and leads to a large separation flow,resulting in the stable working pressure ratio,efficiency and surge margin decreasing dramatically.When the rotor with tip ring performance improved with positive circumferential bowed blade stacking and local skewed tip ring profile,the separation flow is successfully suppressed for all cases at designed rotation speed and the pressure ratio rises by 5.0%,efficiency is improved with 1.6%and surge margin is widened by 5.3%.
作者
刘凡
曹志鹏
赵龙波
关朝斌
牛潇
LIU Fan;CAO Zhipeng;ZHAO Longbo;GUAN Chaobin;NIU Xiao(School of Power and Energy,Northwestern Polytechnical University,Xi’an 710072,China;AECC Sichuan Gas Turbine Research Establishment,Chengdu 610500,China)
出处
《推进技术》
EI
CAS
CSCD
北大核心
2024年第6期79-89,共11页
Journal of Propulsion Technology
基金
国防科技基础加强计划
国家自然科学基金青年基金(12302305)
四川省科技计划(2023NSFSC1333)
中央高校基本科研业务费专项资金~~。
关键词
叶尖风扇
带冠转子
分离流动
叶片积叠线
冠体型线
Fan on blade
Rotor with tip ring
Separation flow
Blade stacking
Tip ring profile
