风扇轮毂泄漏对大涵道比涡扇发动机增压级特性的影响  

Influence of Fan Hub Leakage on Characteristics of High Bypass-ratio Turbofan Engine Booster

作　　者：李艾挺 杨小贺 刘世文 LI Aiting;YANG Xiaohe;LIU Shiwen(AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai,China,200241)

机构地区：[1]中国航发商用航空发动机有限责任公司,上海200241

出　　处：《热能动力工程》2024年第5期15-24,共10页Journal of Engineering for Thermal Energy and Power

摘　　要：为研究大涵道比涡扇发动机风扇出口轮毂流路的气体泄漏对增压级内涵特性的影响,构造了多种简化的轮毂气体泄漏三维计算模型,通过三维数值模拟对比分析了泄漏流量、泄漏缝位置、泄漏缝宽度和泄漏气体温度对增压级内涵特性及流场的影响。结果表明:轮毂流路的气体泄漏对增压级入口气流造成了阻塞,使入口导叶根部的流速、总压亏损,S0静叶入口攻角增大,二次流增强,增压级的流量、压比、效率、裕度特性下降。泄漏流量、泄漏缝位置、泄漏缝宽度、泄漏气体温度均对增压级特性有一定影响,其中泄漏流量对增压级特性的影响最为显著;当泄漏流量由0.7%增加到1.5%,增压级的流量、压比、效率和裕度分别下降3.87%、1.52%、0.98个百分点和10.8个百分点;当泄漏缝位置向下游移动,增压级的流量和压比分别下降0.2%和0.08%,裕度升高4.6个百分点;当泄漏缝宽度增加4 mm,增压级的流量、压比和裕度分别升高0.2%、0.09%和6.2个百分点,效率下降0.34个百分点;当泄漏气体温度升高50 K,增压级的流量、压比、效率分别下降0.44%、0.18%和0.56个百分点。To study the influence of gas leakage in the flow channel of the fan outlet hub of a high bypass-ratio turbofan engine on the characteristics of booster,various simplified three-dimensional computational models of gas leakage were constructed.The effects of leakage flow rates,leak seam positions,leak seam widths,leakage gas temperatures on the characteristic and flow field of the booster were compared and ana-lyzed through 3D numerical simulation.The results indicate that the gas leakage in the flow channel of the hub causes a blockage to the air flow in the inlet of the booster,resulting in velocity and pressure deficit at the root of the inlet guide vane,increase of the angle of attack at the SO inlet,increase of the secondary flow,and decrease of the flow rate,pressure ratio,efficiency and margin characteristics of the booster.The leakage flow rate,leak seam position,leak seam width and leakage gas temperature all have a certain influ-ence on the characteristics of the booster,among which the leakage flow rate has the most significant influ-ence on the characteristics of the booster;when the leakage flow increases from 0.7%to 1.5%,the flow,pressure ratio,efficiency and margin of the booster decrease by 3.87%,1.52%,0.98% and 10.8%re-spectively;when the leak seam position moves downstream,the flow and pressure ratio of the booster decrease by 0.2%and 0.08%respectively,and the margin increases by 4.6%;when the leak seam width increases by 4 mm,the flow,pressure ratio and margin of the booster increase by 0.2%,0.09%and 6.2%respectively,the efficiency decreases by 0.34%;when the leakage gas temperature increases by 50 K,the flow,pressure ratio and efficiency of the booster decrease by 0.44%,0.18%and 0.56% respectively.

关 键 词：涡扇发动机 风扇/增压级 轮毂 泄漏 数值模拟 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程]