PIV Analysis of Inner Flow Field in 90° Bending Duct of Circular-Section with Fore-End Valve

Abstract

Abstract: Through the established recirculation water channel, the inner flow field in 90° bending duct of circular-section with a fore-end valve was measured by particle image velocimetry (PIV). Characteristics of the flow were obtained through correlation analysis of the massive consecutive high-resolution transient velocity maps, including time-averaged velocity field, streamline pattern and vorticity distributions. Through comparative analysis of the time-averaged velocity field: it is concluded that there exist apparent high-speed and lowspeed regions in the bend part; a vortex emerges on specific conditions; the features of the flow field vary considerably along with the diversity of valve opening magnitude, flow rate and section location.

Key words: valve, bend, flow field, particle image velocimetry (PIV), correlation analysis

CLC Number:

TV131

XIE Long-1, JIN Si-Yu-1, 2 , YU Jian-Guo-1, WANG Yu-Zhang-1. PIV Analysis of Inner Flow Field in 90° Bending Duct of Circular-Section with Fore-End Valve[J]. Journal of Shanghai Jiaotong University, 2011, 45(09): 1395-1399.

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