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| Optimization and text for opening profile line of balance valve based on improved design |
| LI Shu-xun1,FAN Yi-lin1,YE Chen2,HOU Ying-zhe1,ZHU Xin-yan2 |
| 1. College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China; 2. Zhejiang Dunan Valve CO., LTD., Zhuji, Zhejiang 311800 China |
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Abstract The dynamic flow balance valve at home and abroad can't satisfy the requirements of ±5% flow rate control. The design formulations for the opening profile lines of valve core were deduced from the concentric annular gap flow theory. The computational fluid dynamics (CFD) method was used to simulate flow of preliminary opening profile, and the flow was tested. Considering influence of flow coefficient and the opening structure on flow, two optimization methods were proposed to improve flow rate control, and optimization results were analyzed by simulation and test. The results show that the flow rate control of the preliminary opening profile is ±16.7%，the flow rate control is improved to ±9.1% with the flow coefficient optimized and is further improved to ±4.2% after the structural optimization of valve core. The optimization results show the efficiency of optimization design method which provides a reference for the opening profile lines design.
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Published: 26 December 2015
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基于改进设计的平衡阀开孔型线优化及试验
针对国内外动态流量平衡阀产品流量控制精度无法满足±5%误差范围要求的问题,从同心环状缝隙流理论出发,推导阀芯开孔型线改进设计计算公式.运用计算流体力学(CFD)技术模拟计算初步设计开孔型线下的流量大小,并通过试验加以验证.在此基础上考虑开孔型线改进设计公式中流量系数以及阀芯开孔的结构形式对流量大小的影响,提出2种改善流量控制精度的阀芯开孔型线优化设计方法,并结合仿真模拟及试验对优化结果进行分析.结果表明,初步设计开孔型线的流量控制精度为±167%,流量系数优化后整体流量控制精度提高至±9.1%,阀芯开孔结构形式优化后流量控制精度得到了进一步改善且最终达到±4.2%的误差范围.优化结果验证了该优化设计方法的有效性,为今后阀芯开孔型线的设计提供了参考.
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