Water Science and Engineering 2010, 3(2) 190-199 DOI:   10.3882/j.issn.1674-2370.2010.02.007  ISSN: 1674-2370 CN: 32-1785/TV

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orifice energy dissipator
theoretical analysis
numerical simulation
two-equation turbulent model
hydraulic characteristics
HE Ning
DIAO Zhen-Xin
Article by He,n
Article by Diao,Z.X

Theoretical and numerical study of hydraulic characteristics of orifice energy dissipator

NingHE*1, Zhen-xing ZHAO2

1. Institute of High Energy Physics, CAS, Beijing 100049, P. R. China 
2. College of Mechanics and Materials, Hohai University, Nanjing 210098, P. R. China


Different factors affecting the efficiency of the orifice energy dissipator were investigated based on a series of theoretical analyses and numerical simulations. The main factors investigated by dimension analysis were identified, including the Reynolds number (Re), the ratio of the orifice diameter to the inner diameter of the pipe ( ), and the ratio of distances between orifices to the inner diameter of the pipe ( ). Then, numerical simulations were conducted with a two-equation turbulence model. The calculation results show the following: Hydraulic characteristics change dramatically as flow passes through the orifice, with abruptly increasing velocity and turbulent energy, and decreasing pressure. The turbulent energy appears to be low in the middle and high near the pipe wall. For the energy dissipation setup with only one orifice, when Re is smaller than 105, the orifice energy dissipation coefficient K increases rapidly with the increase of Re. When Re is larger than 105, K gradually stabilizes. As increases, K and the length of the recirculation region L1 show similar variation patterns, which inversely vary with . The function curves can be approximated as straight lines. For the energy dissipation model with two orifices, because of different incoming flows at different orifices, the energy dissipation coefficient of the second orifice (K2) is smaller than that of the first. If is less than 5, the K value of the model, depending on the variation of K2, increases with the spacing between two orifices L , and an orifice cannot fulfill its energy dissipation function. If is greater than 5, K2 tends to be steady; thus, the K value of the model gradually stabilizes. Then, the flow fully develops, and L has almost no impact on the value of K.

Keywords orifice energy dissipator   theoretical analysis   numerical simulation   two-equation turbulent model   hydraulic characteristics  
Received 2010-06-25 Revised  Online: 2010-06-25 
DOI: 10.3882/j.issn.1674-2370.2010.02.007
Corresponding Authors: Ning HE
Email: hening@ihep.ac.cn
About author:


Bushell, G. C., Yan, Y. D., Woodfield, D., Raper, J., and Amal, R. 2002. On techniques for the measurement of the mass fractal dimension of aggregates. Advances in Colloid and Interface Science, 95(1), 1-50. [doi: 10.1016/S0001-8686(00)00078-6]
Cai, J. M., Ma, J., Zhang, Z. J., and Feng, J. M. 1999. An experimental research on the flow field of orifice plate by using the 2-dimension LDV system. Journal of Hydroelectric Engineering, (4), 51-59. (in Chinese)
Chen, L., Wang, X. X., Wei, H., and Zhang, D. 2006. Prototype observation on cavitation for multi-orifice no. 1 bottom outlet Xiaolangdi Project. Water Power, 32(2), 71-74. (in Chinese)
Launder, B. E., and Spalding, D. B. 1974. The numerical computation of turbulent flows. Computer Methods in Applied Mechanics and Engineering, 3(2), 269-289. [doi: 10.1016/0045-7825(74)90029-2]
Li, Y. Z. 1999. The layout characteristics and energy dissipation of multiple flood-releasing tunnels of Xiaolangdi Project. Water Resources and Hydropower Engineering, 30(3), 10-14. (in Chinese)
Liu, Q. C., Li, G. F., and Xie, S. Z. 1993. A multiple time scale turbulence analysis of pressure tunnel flow through sharp-edged orifices. Journal of Hydroelectric Engineering, 24(2), 27-36. (in Chinese)
Qu, J. X., Xu, W. L., Yang, Y. Q., Wang, W., and Diao, M. J. 2000. Numerical simulation of flow through orifice energy-dissipators in Xiaolangdi flood-discharge tunnel. Journal of Hydrodynamics, Series B, 12(3), 41-46.
Schiestel, R. 1987. Multiple-time-scale modeling of turbulent flow in one point closures. Physics of Fluids, 30(3), 722-731. [doi:10.1063/1.866322]
Tao, W. Q. 2004. Numerical Heat Transfer (Second edition). Xi’an: Xi’an Jiaotong University Press. (in Chinese)
Tian, Z., Xu, W. L., Liu, S. J., Wang, W., Zhang, J. M., and Duan, H. 2005. Numerical calculation of combined plug energy dissipator. Advances in Science and Technology of Water Resources, 25(3), 8-10. (in Chinese)
Wei, H., Chen, L., Wu, Y. H., and Gao, J. B. 2006. Vibration prototype observation of the pipeline for water filling and pressure balance system of no. 3 flood-releasing tunnel of Xiaolangdi multi-purpose project. Water Power, 32(2), 67-70. (in Chinese)
Xia, Q. F., and Ni, H. G. 2003. Numerical simulation of plug energy dissipator. Journal of Hydraulic Engineering, 34(8), 37-42. (in Chinese)
Yang, T., Wang, X. S., and Xia, Q. F. 2004. No. 2 orifice tunnel of Xiaolangdi multipurpose dam project. Water Power, 30(9), 42-46. (in Chinese)
Zhang, J. M., Xu, W. L., Liu, S. J., and Wang, W. 2004. Numerical simulation of turbulent flow in throat type energy dissipators. Journal of Hydraulic Engineering, 35(12), 30-33. (in Chinese)


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