大涵道比风扇/增压级进气畸变数值模拟研究

Numerical Study of High Bypass Ratio Fan/BoosterStage with Inlet Distortion

关键词:  大涵道比风扇/增压级  周向总压畸变  三维彻体力模型  数值模拟

Key words:  High bypass ratio fan/ booster stage  Circumferential total pressure distortion  Three-dimensional body force model  Numerical simulation

摘要:

为探究进口总压畸变下大涵道比风扇/增压级内部流场的主要特征，基于三维彻体力模型的思想，开发了一套能够实现风扇/增压级内外涵联算功能的三维数值计算程序。利用该程序模拟了某大涵道比风扇/增压级在周向总压畸变进气下的三维流场。计算结果表明：大涵道比风扇单转子不同叶高处的畸变传递特征差异较大，转子出口总压畸变强度由叶根到叶尖逐渐降低，在叶尖处衰减为最小值1.5%；在转子出口相应诱导出的总温畸变强度由叶根到叶尖逐渐升高，在叶尖处达到最大值1.4%；进口周向总压畸变导致风扇转子总压比下降0.5%，而风扇转子出口形成的总压总温复合畸变导致增压级总压比下降2%；总压畸变在增压级中呈逐级衰减趋势，而高温畸变区的周向范围在逐级增加。

Abstract:

In order to explore the main characteristics of the internal flow field in a high bypass ratio fan/booster stage with inlet total pressure distortion, a three-dimensional numerical calculation program was developed based on the idea of three-dimensional body force model. This program can realize the synchronous calculation of core and bypass compressors, which was used to simulate the three-dimensional flow field of a high bypass ratio fan/booster stage under circumferential total pressure distortion. The results show that the characteristic of distortion transfer at different blade heights of the fan rotor with large bypass ratio varies greatly. The intensity of total pressure distortion at the rotor outlet decreases gradually from hub to tip, and decreases to a minimum value of 1.5%. Correspondingly, the intensity of total temperature distortion induced at the rotor outlet increases gradually from hub to tip, reaching a maximum value of 1.4%. The total pressure ratio of the fan rotor is reduced by 0.5% due to the inlet circumferential total pressure distortion. Meanwhile, the total pressure ratio of the booster stage is reduced by 2% due to the combined distortion of total pressure and total temperature at the rotor outlet. Besides, the total pressure distortion is attenuated in the booster stage, while the circumferential range of high temperature distortion zones is increasing stage by stage.