Influence Experiment for the Spacing Distance of Orifice Plates to Local Resistance Coefficient in the Pressure Delivery Pipeline

Abstract:

In order to research the influence rule of the spacing distance between orifice plates to the local resistance coefficient and total local water head losses , carried out the experiment research through set the two different relative distance of orifice plates in the pressure delivery pipeline. The experimental results showed that: When the relative distance, the results of total local water head losses calculated by the traditional hydraulics formula with the real measured data, the maximal relative error was less than 3%. This shown that when the relative distance was big, it was no necessary to consider the influence of the relative distance between orifice plates. However, when the relative distance, the real measured data of the total local water losses was much smaller than the calculated data by the traditional calculation formula, the maximal relative error was reached 239.5%. It was explained that when the relative distance was relative small, existed the adjoining influence between orifice plates, so the total local water losses by the multi-orifice plates was not equal to the sum of each water head loss by the single orifice plate, and the total local head loss was not necessarily increased with the number of orifice plates increasing. Whether or not the increasing total local water head losses was closely related with the relative distance of the orifice plates. The traditional local water head loss calculation formula in the hydraulics should be corrected and modified.

• Periodical: Applied Mechanics and Materials (Volumes 744-746)
• Pages: 1092-1100
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.744-746.1092
• Online since: March 2015
• Authors: Lin Li*, Sheng Jin, Zhao Liang Bai
• Keywords: Experimental Study, Local Head Loss, Local Resistance Coefficient, Pressure Delivery Pipeline

References

[1] Dong Zhiyong, Xu Qinghua. Study of water delivery system for hydraulic characteristics of gooseneck section[J]. Study on the hydro science, 1991, 2(3): 96-98.

[2] Tianjin Marine scientific research. Culvert local resistance coefficient of test report[R]. Beijing: Tianjin Marine scientific research.

[3] HE Yiying, ZHAO Yi, SUN Shuqing. Experimental study on local head loss coefficient of bend in pipeline[J]. Journal of Hydraulic Engineering, 2003，11( 11) : 54-58.

[4] Li Tao, Li Angui, Zhou Yan. Experimental and numerical simulation of ventilation and air conditioning low Reynolds number 90o bending resistance coefficient[J]. Journal of Qingdao University of Science, 2006, 27(6): 527-531.

[5] Zhang Xin, Ji Changzhi, Jiang Min. Influence of relative roughness and Reynolds number on local resistance coefficient of 90°-bend pipeline[J]. Journal of hydroelectric engineering, 2013, 32(4): 88-93.

DOI: 10.1109/icmet.2010.5598446

[6] HE Yiying, ZHAO Yi, SUN Shuqing. Interaction of local loss between bends in pipe line[J]. Journal of Hydraulic Engineering, 2004, 2(2): 17-20.

[7] Mao shimin, HE Yiying, Li jiaxing. The new research results of hydraulic pipe and its application[C]. Engineering and high-speed water discharge.

[8] Hydraulic friction[M]. Huang jun, Xia songyou, translation. Beijing: Power Industry Press, (1957).

[9] Miller D S. Internal Flow System [M]. BHRA, (1971).

[10] HE Yiying, Chen huiquan, Mao shimin. Thermal / nuclear power plant circulating water supply piping system hydraulic friction study[M]. Beijing: China Water Resources and Hydropower Research, (2001).

[11] JI Changzhi, ZHANG Xin, JIANG Min. Numerical simulation of influence of 90o-bend pipeline geometric shape on local head loss coefficient [C]/Internation Conference on ICMET, Singapore, 2010: 668-672.

DOI: 10.1109/icmet.2010.5598446

[12] Ministry of Water Resources of Anhui Institute of Hydraulic Research HRWRC will. Experimental study on friction loss of thermal power plant water supply piping system [R] . (1995).

[13] Qiu xiuyun. Hydraulics[M]. Urumqi: Xinjiang Electronic Press, 2008, 96-98.

[14] Hua shaozeng, Yang xuening, translation. Practical Handbook fluid resistance[M]. Beijing: Defense Industry Press, (1985).

[15] Erwin Fried, Idelchik I E, Flow Resistance: A Design Guide for Engineers[R]. (1989).