Influence of Fan Hub Leakage on Characteristics of High Bypass-ratio Turbofan Engine Booster
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 S0 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 de-crease 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 by0.2%,0.09%and6.2%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.
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