• 应用研究 •

### 穿孔壁面通道流动阻力特性研究

1. 中国计量大学计量测试工程学院,杭州310018
• 收稿日期:2017-11-13 修回日期:2018-01-08 出版日期:2018-06-15 发布日期:2018-07-17
• 作者简介:1)董家宁,硕士研究生,主要研究方向为流体力学。E-mail：970902837@qq.com;2)张洪军,教授,主要研究方向为流量、能源计量技术、流动控制等。E-mail：zhanghongjun@cjlu.edu.cn

### THE FLOW RESISTANCE CHARACTERISTICS OF PERFORATED LINER DUCTS

DONG Jianing, ZHANG Hongjun, YANG Yang

1. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
• Received:2017-11-13 Revised:2018-01-08 Online:2018-06-15 Published:2018-07-17

Abstract:

In this paper, the inner flow of perforated liner ducts is studied numerically by the computational fluid dynamics method. The fractional resistance characteristics of the ducts are analyzed. In the simulation,it is assumed that the air flow will not go into or out of the sound absorbing material through the pinholes. It is found that the combination of the realizable k--" model with an enhanced wall function can be used for the simulation of this kind of duct flows, and the pressure drop deviation between the numerical simulation and the experimental measurement is less than 10%. In the flow resistance calculation for perforated liner ducts in the engineering design, the concept of equivalent roughness is proposed, which can be calculated by the Colebrook equation and the Darcy--Weisbach Formula based on the pressure drop data obtained by numerical simulations.The in fluence of the size of the pinholes and the perforation rate of the perforated plates on the equivalent roughness is examined. It is found that the equivalent roughness is proportional to the square of the perforation rate, and is linear to the size of the pinholes.

Key words:

perforated liner ducts|numerical simulation|equivalent roughness|flow resistance