An improved characteristics length in strouhal number for internal flow induced acoustics in corrugated pipe

International Conference on Process Engineering and Advanced Materials 2018

King, Yeong Jin^1,2 ; Salman Leong, M.^1 ; Chong, Kok Yung^2 ; Lee, Jer Vui^2

Institute of Noise and Vibration, Universiti Teknologi Malaysia, Johor, Malaysia^1

Universiti Tunku Abdul Rahman, Selangor, Malaysia^2

关键词: Characteristic length;    Characteristics length;    Corrugated pipes;    Critical flow conditions;    FLUENT software;    High-intensity noise;    Self-sustained oscillations;    Two-dimensional (2-D) numerical simulation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/458/1/012040/pdf
DOI  :  10.1088/1757-899X/458/1/012040

来源: IOP

【 摘 要 】

Corrugated pipes often experience self-sustained oscillations which leads to high intensity noise, known as "whistling" during critical flow conditions. In order to determine the peak whistling Strouhal number (Srp-w ) and whistling amplitude, a two dimensional (2D) numerical simulation method using Fluent software is proposed in this paper. The flow pattern of the fluid passing through the corrugated pipe and the effect of pipe geometries on the Srp-w and whistling amplitude are investigated. A ratio of is found to be a good indicator of the consistency of Srp-w where the l is the plateau length, w is the width of the corrugation, and rup is the upstream radius of the corrugation. Furthermore, optimal characteristic length is also assessed among three different characteristic lengths including w + rup , w and . The is found to be the optimal as the characteristic length. This finding is significant as it can allow us to avoid critical flow condition to minimize and prevent the whistling phenomenon more accurately and effectively by using the proposed equations.