Numerical Analysis on Acoustic and Resistance Performances of Air Intake Filter of Roots Blower
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摘要: 以某型罗茨风机用空气滤清器为研究对象,采用声学有限元法和计算流体动力学方法,分别对空气滤清器的声场和流场进行数值模拟,分析有无滤芯及不同进气速度下滤芯高度、内径和外径对空气滤清器传递损失和压力损失的影响。研究表明:有滤芯时空气滤清器对1200 Hz以上高频噪声的消声性能有较大改善,提供了更好的宽频消声特性,但滤芯也会产生附加的压力损失;要使空气滤清器具有较好的消声性能且压力损失较小,滤芯高度应在300 ~ 350 mm范围内选取;在允许的压力损失范围内,相同滤芯厚度下应尽可能以增大滤芯外径的方式来提高消声性能。本文的研究结果可以为空气滤清器的结构优化与设计提供参考。Abstract: The air intake filter of a Roots blower is chosen as the study object, the acoustic finite element method and the computational fluid dynamics method are applied to the numerical simulation of the sound field and flow field in the air filter to analyze the effects of the filter core and its height, inner diameter and outer diameter under different inlet velocities on the transmission loss and pressure loss. Results show that the air filter with filter core has a great improvement on the acoustic performance of high frequency noise above 1200 Hz, which can provide better broadband noise reduction performance than that without a filter core; however, the existence of filter core will result in additional pressure loss. When the height of the filter core varies in the range of 300 to 350 mm, the filter has better acoustic performance and less pressure loss. To improve the acoustic performance of the filter, within the allowable range of pressure loss, increasing the outer diameter of the filter core is a priority option while keeping the filter core thickness constant. This work may provide guidance for the structural design and optimization of air intake filters.
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Key words:
- air filter /
- filter core /
- structural parameter /
- transmission loss /
- pressure loss
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表 1 模拟用空滤器参数
计算参数 计算取值 进口气流速度v/(m·s−1) 15,20,25 滤芯高度H/mm 200,250,300,350,400 滤芯内径d/mm 130,140,150,160,170 滤芯外径D/mm 160,170,180,190,200 -
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