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首页> 外文会议>ASME turbine blade tip technical symposium 2013 : Turbine blade tip steady and unsteady aerodynamics ... >EXPERIMENTAL AND UNSTEADY NUMERICAL INVESTIGATION OF THE TIP CLEARANCE NOISE OF AN AXIAL FAN
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EXPERIMENTAL AND UNSTEADY NUMERICAL INVESTIGATION OF THE TIP CLEARANCE NOISE OF AN AXIAL FAN

机译：轴流风扇尖端间隙噪声的实验和非定常数值研究

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摘要

The aerodynamic and aeroacoustic performance of axial fans are strongly affected by the unavoidable tip clearance. Two identical fan impellers but with different tip clearance ratio were investigated. Unsteady wall pressure fluctuations in the tip region of the rotating blades and on the interior wall of the duct type shroud and the overall sound radiated were analysed by an unsteady numerical Scale-Adaptive Simulation (SAS) and unsteady surface pressure measurements in both, the stationary and rotating system. Based on SAS-predicted pressure fluctuations on the blade surfaces the acoustic analogy according to Ffowcs Williams and Hawkings (FWH) was employed to calculate the sound pressure in the far field. In general, experimentally and numerically determined unsteady flow were found to be a tendentially good agreement. The spatial and temporal structure of the tip vortex system and the resulting unsteady pressure distribution on the surfaces in the vicinity of the blade tips was revealed in good detail. The vortices' strength and trajectories as well as the unsteadiness are controlled by the size of the tip clearance and the operating point: As tip clearance is increased blade/vortex interaction becomes more prevalent and with it the unsteady surface pressure and eventually the sound radiated into the far field. The broadband tip clearance noise was acceptably predicted from the simulation results, while the prediction at discrete frequency should still be improved in the further work.
机译：轴流风扇的空气动力学和空气声学性能受到不可避免的叶尖间隙的强烈影响。研究了两个相同的风扇叶轮，但叶尖间隙比不同。通过非稳态数值尺度自适应模拟（SAS）和非稳态表面压力测量来分析旋转叶片的尖端区域和风道罩的内壁上的非稳态壁压力波动以及辐射的整体声音和旋转系统。基于SAS预测的叶片表面压力波动，采用Ffowcs Williams和Hawkings（FWH）的声学比喻来计算远场中的声压。总的来说，实验和数值确定的非恒定流被认为是趋势良好的一致性。叶片涡流系统的空间和时间结构以及叶片尖端附近表面上产生的不稳定压力分布都得到了很好的揭示。涡流的强度和轨迹以及不稳定性由叶尖间隙和工作点的大小控制：随着叶尖间隙的增加，叶片/涡流的相互作用变得更加普遍，不稳定的表面压力以及最终的声音辐射进入远场。从模拟结果可以很好地预测宽带尖端间隙噪声，而在进一步的工作中仍应改进离散频率的预测。

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