摘要
为了研究对转风扇的流动特点及气动布局对风扇性能影响规律,完成两级对转风扇气动设计。采用三维数值模拟软件对对转风扇进行数值仿真研究,研究结果表明:对转风扇设计点压比3.15,等熵效率0.83和喘振裕度17.1%,其他转速喘振裕度达到20%以上,达到了设计指标要求。由于对转效应,设计转速第二级转子全叶高进口马赫数为超声速。虽然做功能力大幅度提升,但是带来三个不利影响:一是产生严重的激波损失,二是高转速风扇出口背压无法有效传递至第一级转子,三是第二级转子进口马赫数全转速变化剧烈,中低转速叶型与进口马赫数严重不匹配,分别是限制对转风扇效率和高转速喘振裕度进一步提升的主要因素。为保证对转风扇出口气流全工况沿子午向,保留出口静子是必要的。对转风扇需配合使用进口导叶可调或转子安装角可调,否则会导致低转速效率和喘振裕度偏低而无法满足发动机使用需求。转子安装角可调对低转速性能提升更明显,但是需要开展可调机构关键技术研究。
In order to study the flow characteristics of counter-rotating fan and the effect of aerodynamic layout on fan performance,aerodynamic design of a two-stage counter-rotating fan was completed.Three dimensional numerical simulation was conducted on the counter-rotating fan,the results show that the counter-rotating fan achieves the design requirements with a design point pressure ratio of 3.15,an isentropic efficiency of 0.83,and a stall margin of 17.1%at the design speed,while the stall margin exceeds 20%at other speeds.Due to the counter-rotating effect,the inlet Mach number of the second-stage rotor reaches supersonic speed in all radial regions at the design speed.Despite significant work capacity improvements,this leads to three adverse effects:first,it generates serious shock losses;second,the back pressure at the outlet of fan at the high-speed cannot be effectively transmitted to the first-stage rotor;third,the inlet Mach number of the second-stage rotor varies severely at full speed,and the blade profile at medium and low speeds is seriously mismatched with the inlet Mach number,which are the main factors limiting further improvement of the efficiency and stall margin of the counterrotating fan at the high-speed.Retaining the outlet stator is necessary to ensure that the outlet airflow of the counter-rotating fan remains meridional under all opetating cinditions.It is necessary to use adjustable inlet guide vanes or adjustable rotor installation angles with the counter-rotating fan,otherwise low-speed efficiency and stall margin may be insufficient to meet engine operational requirements.Adjusting the rotor installation angle has a more pronounced effect on improving low-speed performance,but requires further research on key technologies for adjustable mechanisms.
作者
张耀光
吴广晗
ZHANG Yaoguang;WU Guanghan(AECC Shenyang Engine Research Institute,Shenyang 110015,China)
出处
《推进技术》
北大核心
2025年第7期39-48,共10页
Journal of Propulsion Technology
关键词
对转风扇
气动布局
全叶高超声速
进口导叶可调
转子安装角可调
Counter-rotating fan
Aerodynamic layout
Supersonic in all radial regions
Adjustable inlet guide vanes
Adjustable rotor installation angle
作者简介
通讯作者:张耀光,硕士,高级工程师,研究领域为风扇/压气机气动设计及叶轮机械气动热力学。E-mail:791598301@qq.com。
