Effects of inlet guide vanes asymmetry layouts on aerodynamic excitation
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摘要:
导叶非均匀布局是抑制下游转子叶片气动激励的重要方法，对半均分的非均匀布局既能以叶片数为设计参数也能以通道面积为设计参数。推导了对半均分布局下的气动激励理论解，比较了两种设计方案的区别；以某1.5级压气机为例，对比两种非均匀方案下的气动激励特性，分析转子叶片表面非定常气动力的频谱特性，探究激励特性与通道面积的关系，揭示对半均分布局气动激励的分频机理。结果表明：导叶叶排通道面积的变化导致气动激励分频，气动激励具有一定传播规律进而影响转子叶片气动响应幅值分布，两种非均匀方案下气动激励的空间分布和频域特征不同，以通道面积为设计参数时能够获得准确的非均匀激励模式。
Abstract:A key technique for reducing the aerodynamic excitation of downstream rotor blades is the asymmetry layout of inlet guide vanes. The half and half layout divided can be defined in terms of both the number of blades and the vane spacing. This study derives a theoretical solution to aerodynamic excitation with half and half layout and compares the two design schemes’ differences. We compare the aerodynamic excitation properties under two asymmetry schemes using a 1.5-stage compressor as an example, examine the spectral properties of the aerodynamic forces on the rotor blade surface, investigate the relationship between the excitation properties and the vane spacing, and identify the frequency separation mechanism of the aerodynamic excitation for half and half layout. The findings demonstrate that altering the guide vane row’s vane spacing causes the aerodynamic excitation to be frequency divided, the amplitude distribution of the aerodynamic response of rotor blades is affected by the propagation law of aerodynamic excitation, and that the spatial distribution and frequency domain characteristics of the pneumatic excitation differ between the two asymmetry schemes.
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图 3 总压比-质量流量曲线
Figure 3. Characteristic curves of total pressure ratio and mass flow rate
图 9 导叶出口50%叶高节径谱（均匀方案）
Figure 9. Nodal diameter at 50% span at outlet guide vane （symmetry scheme）
图 11 压力时域曲线和频谱图（均匀方案）
Figure 11. Time-history and frequency characteristic of pressure （symmetry scheme）
图 12 导叶出口50%叶高节径谱（三通道非均匀方案）
Figure 12. Nodal diameter at 50% span at outlet guide vane （asymmetry scheme with three-vane spacing）
图 13 压力时域曲线和频谱图（三通道非均匀方案）
Figure 13. Time-history and frequency characteristic of pressure （asymmetry scheme with three-vane spacing）
图 14 导叶出口50%叶高节径谱（两通道非均匀方案）
Figure 14. Nodal diameter at 50% span at outlet guide vane （asymmetry scheme with two-vane spacing）
图 15 压力时域曲线和频谱图（两通道非均匀方案）
Figure 15. Time-history and frequency characteristic of pressure （asymmetry scheme with two-vane spacing）
图 16 非均匀布局简化公式计算的理论空间节径谱
Figure 16. Calculation of theoretical nodal diameter by simplified formula of asymmetric layout
表 1 压气机几何参数
Table 1. Compressor geometry parameters
参数 数值 导叶叶高/mm 110 转子叶高/mm 90 静子叶高/mm 69 转子设计转速/（r/min） 17000 转子叶尖间隙/mm 0.593 
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表 3 不同均匀布局导叶出口50%叶高处激励幅值
Table 3. Excitation amplitude at 50% span at outlet guide vane with different symmetric layouts
激励阶次 导叶数为18 导叶数为19 导叶数为20 1阶尾迹 0.28985 0.30775 0.32636 2阶尾迹 0.27982 0.29647 0.31390 1阶势干扰 0.39534 0.42024 0.44415 2阶势干扰 0.35843 0.38073 0.40151
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