Slit-type energy dissipator is widely used in hydraulic projects of high water head, large discharge, and narrow river valley due to its simple structure and high efficiency. The water wing caused by shock waves in the contracted section of slit-type energy dissipator may bring about harmful effects, which, however, has not received sufficient attention. In this article, the hydraulic characteristics of slit-type energy dissipator are investigated by means of physical model and theoretical analysis to reveal the internal relation between shock waves and water wings. A correction coefficient is introduced for the application of Ippen’s theory to slit-type energy dissipator. The expression of the coefficient is obtained, and simplified formulas for shock wave angle and water wing scope are theoretically derived, which was verified accurate by experimental data, with the relative error within 5%.
Key words
slit-type energy dissipator /
shock wave of flow /
water wing /
motion characteristics /
hydraulic modelling
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References
[1] CHENG Chun-tian,SHEN Jian-jian,WU Xin-yu,et al. Operation Challenges for Fast-growing China’s Hydropower Systems and Respondence to Energy Saving and Emission Reduction[J]. Renewable and Sustainable Energy Reviews,2012,16(5): 2386-2393.
[2] 李乃稳,许唯临,周茂林,等.高拱坝坝身表孔和深孔水流无碰撞泄洪消能试验研究[J].水利学报,2008,39(8):927-933.
[3] 肖兴斌.窄缝式消能工在高坝消能中的应用与发展综述[J].水电站设计,2004,20(3):76-81.
[4] 陈忠儒,陈义东,黄国兵.窄缝式挑坎体型研究及其挑流水舌距离的估算[J].长江科学院院报,2002,19(4):11-14.
[5] 马吉明,张永良,郑双凌.水布垭工程差动窄缝挑坎型溢洪道水力特性的试验研究[J].水力发电学报,2007,26(3):93-98.
[6] 张彦法,吴文平.窄缝挑坎水面线及水舌挑距的试验研究[J].水利学报,1989,(5):14-21.
[7] 戴震霖,于月增.深孔窄缝挑流水力参数及挑距的研究[J].陕西水力发电,1992,8(1):7-13.
[8] WU Jian-hua,MA Fei,YAO Li. Hydraulic Characteristics of Slit-type Energy Dissipaters[J]. Journal of Hydrodynamics,2012,24(6): 883-887.
[9] WU Jian-hua, WAN Bin, MA Fei, et al. Flow Choking Characteristics of Slit-type Energy Dissipaters[J]. Journal of Hydrodynamics,2015,27 (1):159-162.
[10]柳 杨,马 飞,吴建华.窄缝坎的冲击波及水舌入水宽度的计算[J].水利水电科技进展, 2014,34(3):20-23.
[11]黄智敏,何小惠,朱红华,等.窄缝式挑坎体型及动水压强特性分析[J].中国农村水利水电,2006,(5):69-71,74.
[12]LUO Bei-er,WANG Jun-xing,ZHANG Ying-ying. Researches on the Chaotic Characteristics of Fluctuating Pressure in Slit-type Energy Dissipator[J]. Advanced Materials Research,2014,1025/1026: 1150-1159.
[13]IPPEN A T. Gas-wave Analogies in Open Channel Flow[C]∥University of Iowa.Proceedings of the 2nd Hydraulics Conference. Iowa, June 1-4, 1942:248-265.
[14]HAGER W H,BRETZ N V.Discussion of “Simplified Design of Contractions in Supercritical Flow” by Terry W. Strum[J].Journal of Hydraulic Engineering,1987, 113(3): 422-427.
[15]HAGER W H, SCHWALT M, JIMENEZ O,et al. Supercritical Flow near an Abrupt Wall Deflection[J]. Journal of Hydraulic Research, 1994,32(1):103-118.
[16]刘韩生,倪汉根.急流冲击波简化式[J].水利学报,1999,21(6):56-60.
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