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首页> 外文会议>ASME international mechanical engineering congress and exposition;IMECE2011 >STUDIES ON DOWNSTREAM STATOR WITH ROTOR RE-STAGGERING AND FORWARD SWEEPING IN A SUBSONIC AXIAL COMPRESSOR STAGE
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STUDIES ON DOWNSTREAM STATOR WITH ROTOR RE-STAGGERING AND FORWARD SWEEPING IN A SUBSONIC AXIAL COMPRESSOR STAGE

机译：亚音速轴流压气机级的转子再滞流和正向扫气的下流定子研究

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摘要

The present numerical work studies the flow field in subsonic axial compressor stator passages for: (a) preceding rotor sweep (b) preceding rotor re-staggering (three stagger angle changes: 0°, +3° and +5°); and (c) stator sweeping (two 20° forward sweep schemes). The following are the motives for the study: at the off-design conditions, compressor rotors are re-staggered to alleviate the stage mismatching by adjusting the rows to the operating flow incidence. Fundamental to this is the understanding of the effects of rotor re-staggering on the downstream component. Secondly, sweeping the rotor stages alters the axial distance between the successive rotor-stator stages and necessitates that the stator vanes must also be swept. To the best of the author's knowledge, stator sweeping to suit such scenarios has not been reported. The computational model for the study utilizes well resolved hexahedral grids. A commercial CFD package ANSYS~® CFX 11.0 was used with standard k-ω turbulence model for the simulations. CFD results were well validated with experiments. The following observations were made: (1) When the rotor passage is closed by re-staggering, with the same mass flow rate and the same stator passage area, stators were subjected to negative incidences. (2) Effect of stator sweeping on the upstream rotor flow field is insignificant. Comparison of total pressure rise carried by the downstream stators suggests that an appropriate redesign of stator is essential to match with the swept rotors. (3) While sweeping the stator is not recommended, axial sweeping is preferable over true sweeping when it is necessary.
机译：目前的数值研究研究了亚音速轴向压缩机定子通道中的流场，它们是：（a）转子前掠（b）转子前交错（三个交错角变化：0°，+ 3°和+ 5°）; （c）定子扫掠（两种20°向前扫掠方案）。以下是研究的动机：在非设计条件下，重新调整压缩机转子的位置，以通过调整行数以适应工作流入射来减轻级不匹配。对此的基础是对转子重新交错对下游组件的影响的理解。其次，扫掠转子级改变了相继的转子-定子级之间的轴向距离，并且必须还必须清除定子叶片。据作者所知，尚未报道适合此类情况的定子清扫。该研究的计算模型使用了解析度很好的六面体网格。仿真使用了商用CFD软件包ANSYS〜®CFX 11.0和标准k-ω湍流模型。 CFD结果已通过实验很好地验证。观察到以下结果：（1）当通过重新交错关闭转子通道时，在相同的质量流量和相同的定子通道面积下，定子受到负入射。 （2）定子清扫对上游转子流场的影响不明显。比较下游定子带动的总压力上升表明，对定子进行适当的重新设计对于与扫掠转子相匹配是必不可少的。 （3）虽然不建议对定子进行扫掠，但在必要时，轴向扫掠比真正的扫掠更可取。

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