Influence of Sidewall Angle on Discharge Capacity of Trapezoidal Key Weir

YUAN Liu; JI Qing-feng

doi:10.11988/ckyyb.20210685

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Journal of Changjiang River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (10) : 151-157. DOI: 10.11988/ckyyb.20210685

RIVER DIVERSION HYDRAULICS

Influence of Sidewall Angle on Discharge Capacity of Trapezoidal Key Weir

YUAN Liu, JI Qing-feng

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Abstract

As the further development of piano key weir,trapezoidal piano key (TPK) weir is of strong discharge capacity and is slightly influenced by terrain.To study the effect of different sidewall angles on the discharge capacity of trapezoidal key weir,RNG k-ε turbulence model and VOF method was used to simulate the free surface of weirs with five different sidewall angles.Results show that α< 0° has a negative effect on the discharge capacity of TPK weir.The increase of sidewall angle enhances the discharge capacity.When α=9°,the discharge capacity is no longer improved.In addition,the discharge capacity of different overflow fronts was analyzed via numerical simulation,and the internal influence mechanism of sidewall angle on the discharge capacity was revealed.

Key words

trapezoidal piano key weir / sidewall angles / discharge capacity / numerical simulation / hydraulic characteristic

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YUAN Liu, JI Qing-feng. Influence of Sidewall Angle on Discharge Capacity of Trapezoidal Key Weir[J]. Journal of Changjiang River Scientific Research Institute. 2022, 39(10): 151-157 https://doi.org/10.11988/ckyyb.20210685

References

[1] LEMPÉRIÈRE F,OUAMANE A.The Piano Keys Weir:A New Cost-effective Solution for Spillways[J].Hydropower Dams,2003,10(5):144-149.
[2] PFISTER M,SCHLEISS A J.Comparison of Hydraulic Design Equation for A-Type Piano Key Weirs[C] //Proceeding of the International Conference and Exhibition,Water Storage and Hydropower Development for Africa,Addis Ababa,Ethiopia,April 16-18,2013.
[3] RIBERIO M L,PFISTER M,SCHLEISS A J,et al.Hydraulic design of A-type piano key weir[J].Hydraulic Research,2012,50(4):400-408.
[4] 李珊珊,李国栋,苗洲,等.琴键堰不同堰高泄流特性的数值模拟[J].水利水电技术,2016,47(5):60-64.
[5] 姜铎,李国栋,李珊珊.不同上下游倒悬比琴键堰泄流特性试验研究[J].水利水电技术,2019,50(7):124-130.
[6] 祁媛媛,李国栋,李珊珊,等.琴键堰过流水力特性数值模拟[J].南水北调与水利科技,2018,16(1):164-169,175.
[7] MACHIELS O,EPRICUM S,DEWALS B J,et al.Experimental Observation of Flow Characteristics over a Piano Key Weir[J].Hydraulic Research,2011,49(3):359-366.
[8] 李国栋,苗洲,高蓓,等.琴键堰不同溢流前缘泄流特性的数值模拟研究[J].水力发电学报,2015,34(8):77-84.
[9] KABIRI-SAMANI A,JAVAHERI A.Discharge Coefficient for Free and Submerged Flow over Piano Key Weirs[J].Hydraulic Research,2012,50(1):114-120.
[10] 郭新蕾,杨开林,夏庆福,等.琴键堰泄流能力特性分析[J].水利学报,2014,45(7):867-874,882.
[11] 胡晗,杨伟,侯冬梅.琴键堰水力特性数值模拟[J].长江科学院院报,2019,36(4):60-66.
[12] KARAEREN D,BOZKUS Z.Comparison of Performance of Labyrinth and Piano Key Weirs in Increasing the Spillway Capacity of Dams[C] //Proceedings of the International Conference on Civil and Environmental Engineering.Cappadocia,Nevşehir,Turkey,May 20-23,2015.
[13] ANDERSON R M,TULLIS B P.Piano Key Weir Hydraulics and Labyrinth Weir Comparison[J].Irrigation and Drainage Engineering,2013,139(3):246-253.
[14] SAFARZADEH A,NOROUZI B.3 Dimensional Hydrodynamics of Curved Piano Key Weirs in Plan[J].Journal of Hydraulics,2014,9(3):61-79.
[15] BINIT K,SUBHOJIT K,ZULFEQUAR A.Evaluation of Discharge Equations of the Piano Key Weirs[J].Flow Measurement and Instrumentation,2019,68:101577.
[16] BORGHEI S M,PARVANEH A.Discharge Characteristics of a Modified Oblique Side Weir in Subcritical Flow[J].Flow Measurement and Instrumentation,2011,22:370-376.
[17] URA M,KITA Y,AKIYAMA J,et al.Discharge Coefficient of Oblique Side Weirs[J].Journal of Hydroscience and Hydraulic Engineering,2001,19(1):85-96.