非轴对称导叶尾迹对低速轴流压气机的影响
Effects of non-axisymmetric IGV wakes on a low speed axial compressor
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摘要: 在轴对称尾流撞击实验的基础上, 进行了多种非轴对称尾流撞击实验研究.当合理安排进口导叶的数目和周向分布形式时, 进口导叶(IGV)的非轴对称尾迹能对下游转子流场产生有益的非定常耦合激励作用.与轴对称尾流撞击方案相比, 非轴对称尾流撞击方案在保持了有益的高频激励信号的同时, 引入了合适的低频方波激励信号和其他有益的副频激励信号, 使得导叶尾迹更容易与压气机中的复杂涡系产生耦合激励作用, 例如通道涡、间隙涡和尾迹分离涡等.实验结果显示, 非轴对称尾流撞击方案B能使压气机的最高效率提高1.2%, 总压升和稳定裕度也略有增加.Abstract: Based on the axisymmetric wake impact experiment, several non-axisymmetric wake impact experiments were carried out.When the number and circumferential positions of inlet guide vanes(IGV) were logical, the wakes of non-axisymmetric IGVs could make beneficial unsteady excitation on downstream rotor field.In these experiments, some suitable non-axisymmetric wake impact plans worked better than the axisymmetric wake impact plan.As compared to the axisymmetric wake impact plan, the non-axisymmetric wake impact plan could supply multi-frequency exciting signals.In addition to the beneficial high-frequency signal, the non-axisymmetric plan B generated a low-frequency square-wave exciting signal and some beneficial secondary signals.Based on the unsteady cooperative flow theory, the exciting wakes in non-axisymmetric plan were easier to cooperate with complicated vortices in a compressor, such as clearance vortices, passage vortices and separated vortices.The non-axisymmetric wake impact plan B in this paper could make the max efficiency increase by 1.2%, total pressure rise and stall margin rise by a little.
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Key words:
- axial compressor /
- wakes /
- non-axisymmetric /
- cooperate
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