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、泄漏缝大小、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、泄漏缝大小、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%，增压级流量下降3.87%，压比下降1.52%，效率下降0.98个百分点，裕度下降10.8个百分点。

To study the influence of gas leakage at the fan outlet root of a high-bypass ratio turbofan engine on the characteristics of booster, various simplified three-dimensional computational gas leakage models were constructed. The effects of leakage flow rates, leakage gap positions, leakage gap sizes, leakage gas temperatures on the characteristic and flow field of the booster were compared and analyzed through 3D numerical simulation. The results indicate that the gas leakage at the hub causes a blockage 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 S0 inlet, increase of the secondary flow, and decrease of the flow rate, efficiency and margin characteristics of the booster. The leakage flow rate, leakage gap location, leakage gap size, and leakage gas temperature all have a certain influence on the characteristics of the booster, among which the leakage flow rate has the most significant influence on the characteristics of the booster. When the leakage flow increased from 0.7% to 1.5%, the booster flow decreased by 3.87%, the pressure ratio decreased by 1.52%, the efficiency decreased by 0.98 percentage points, and the margin decreased by 10.8 percentage points.

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