采用穿孔板降低高压燃气管道阀流噪声的数值研究

Gyunam Kim, Ga-ram Ku, C. Cheong, W. Kang, Kuksu Kim
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引用次数: 0

摘要

本文提出了一种评估高压气体管道中阀门流动噪声的数值方法,并定量分析了穿孔板对降低高压气体管道中阀门流动噪声的影响。首先,利用高精度非定常可压缩大涡模拟技术对高压管道中阀门的流动和流动噪声进行了预测。通过与实测壁面压力谱的比较,验证了数值计算结果的有效性。其次,利用管道平均流量下传播声波的声功率公式,分析了阀门流量下传播声波的声功率。在分析结果的基础上,在阀门下游设计并安装了穿孔板以抑制阀门流动噪声,并采用相同的数值计算方法预测了下游声波的声功率。通过将预测结果与现有系统的结果进行比较,证实了降低9.5 dB的效果。基于这些结果,目前的数值方法有望用于降低现有系统以及设计阶段的阀门流量噪声。
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Numerical investigation on reduction of valve flow noise in high pressure gas pipe using perforated plates
In this study, a numerical methodology is proposed for evaluating valve flow noise in a pipe conveying high pressure gas, and the effects of perforated plates on reduction of such valve flow noise are quantitatively analyzed. First, high-accurate unsteady compressible Large Eddy Simulation techniques are utilized to predict flow and flow noise by a valve in a high-pressure pipe. The validity of the numerical result is confirmed by comparing the predicted wall pressure spectrum with the measured one. Next, the acoustic power of downstream-propagating acoustic waves due to the valve flow is analyzed using an acoustic power formula for acoustic waves propagating on mean flow in a pipe. Based on the analysis results, perforated plates are designed and installed downstream of the valve to suppress the valve flow noise and the acoustic power of downstream-going acoustic waves is predicted by using the same numerical procedure. The reduction by 9.5 dB is confirmed by comparing the predicted result with that of the existing system. Based on these results, the current numerical methodology is expected to be used to reduce valve flow noise in an existing system as well as in a design stage.
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来源期刊
CiteScore
0.60
自引率
50.00%
发文量
1
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