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首页> 外文会议>SAE Noise and Vibration Conference and Exhibition >Turbocharger Centrifugal Compressor Casing Treatment for Improved BPF Noise Using Computational Fluid Dynamics
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Turbocharger Centrifugal Compressor Casing Treatment for Improved BPF Noise Using Computational Fluid Dynamics

机译：涡轮增压器离心式压缩机套管处理，用于改善BPF噪声使用计算流体动力学

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摘要

The conventional ported shroud recirculation casing treatment elevates narrowband noise at blade pass frequency. A new ported shroud recirculating casing treatment was implemented in Ford’s 3.5L turbo gas engine as Noise Vibration and Harshness (NVH) counter measure to reduce whoosh (broadband flow noise) noise without elevating narrowband noise at blade pass frequency. The new ported shroud design incorporates holes between the main and secondary recirculating passage and a slight cross-sectional area reduction just upstream of the impeller. These design features reduce whoosh noise without elevating the first order and the sixth order tonal noise at blade pass frequency. The new ported shroud design decreases narrowband tonal noise sound pressure level by 3-6 dB in the low to mid flow region compared to the baseline design. Computational Fluid Dynamics (CFD) tools were used to develop this casing treatment design.
机译：传统的移植护罩再循环套管处理在叶片通过频率下提升了窄带噪声。在FORD的3.5L Turbo燃气发动机中实施了一种新的搬运护罩循环套管处理，作为噪音振动和粗糙度（NVH）计数器测量，以减少WHOSH（宽带流量噪声）噪声而不提升叶片通频频率的窄带噪声。新的移植护罩设计包括主循环循环通道与次要循环通道之间的孔以及在叶轮上游的略微横截面积减小。这些设计功能减少了Whoosh噪音而不提升刀片通过频率的第一个订单和第六级音调噪声。与基线设计相比，新的移植护罩设计将窄到中流区域中的窄带音调声压力水平降低3-6dB。计算流体动力学（CFD）工具用于开发这种套管处理设计。

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