Influence of bluff body shape on wall pressure distribution in vortex flowmeter
来源期刊：中南大学学报(英文版)2013年第3期
论文作者：SUN Zhi-qiang(孙志强) LI Zhi-yong(李志勇) JIANG Yun(蒋赟) ZHOU Hong-liang(周宏亮)
文章页码：724 - 729
Key words：vortex flowmeter; bluff body shape; wall pressure; irrecoverable pressure loss
Abstract: To investigate the influence of bluff body shape on wall pressure distribution in a vortex flowmeter, experiments were conducted on a specially designed test section in a closed water rig at Reynolds numbers of 6.2×104-9.3×104. The cro, ss sections of the bluff bodies were semicircular, square, and triangular shaped, and there were totally 21 pressure tappings along the conduit to acquire the wall pressures. It is found that the variation trends of wall pressures are basically identical regardless of the bluff body shapes. The wall pressures begin to diverge from 0.3D (D is the inner diameter of the vortex flowmeter) in front of the bluff body due to the diversity in shape, and all reach the minimum values at 0.3D behind the bluff body. A discrepancy between the triangular or square cylinder and the semicircular cylinder in wall pressure change is observed at 0-0.1D behind the bluff body. It is also found that the wall pressures and irrecoverable pressure loss coefficients increase with flow rates, and the triangular cylinder causes the smallest irrecoverable pressure loss at a fixed flow rate.
SUN Zhi-qiang(孙志强)1,2, LI Zhi-yong(李志勇)1,2, JIANG Yun(蒋赟)1,2, ZHOU Hong-liang(周宏亮)1,2
(1. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
2. Hunan Key Laboratory of Energy Conservation in Process Industry (Central South University),
Changsha 410083, China)
Abstract:To investigate the influence of bluff body shape on wall pressure distribution in a vortex flowmeter, experiments were conducted on a specially designed test section in a closed water rig at Reynolds numbers of 6.2×104-9.3×104. The cro, ss sections of the bluff bodies were semicircular, square, and triangular shaped, and there were totally 21 pressure tappings along the conduit to acquire the wall pressures. It is found that the variation trends of wall pressures are basically identical regardless of the bluff body shapes. The wall pressures begin to diverge from 0.3D (D is the inner diameter of the vortex flowmeter) in front of the bluff body due to the diversity in shape, and all reach the minimum values at 0.3D behind the bluff body. A discrepancy between the triangular or square cylinder and the semicircular cylinder in wall pressure change is observed at 0-0.1D behind the bluff body. It is also found that the wall pressures and irrecoverable pressure loss coefficients increase with flow rates, and the triangular cylinder causes the smallest irrecoverable pressure loss at a fixed flow rate.
Key words:vortex flowmeter; bluff body shape; wall pressure; irrecoverable pressure loss
