The influence of inlet to outlet width ratio on The hydraulic performance of piano key weir (PKW-type A)
A piano key weir (PKW) is a modified version of non-linear weirs and it can be obtained via amending the centerline length of the weir by a small footprint. It is developed to increase the hydraulic performance of the linear weirs via increasing the pass discharge and the energy dissipation. A labor...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-06-01
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| Series: | Water Practice and Technology |
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| Online Access: | http://wpt.iwaponline.com/content/17/6/1273 |
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| author | Shimal Khalid Mero Dilshad Abdul Jabbar Haleem Ali Abduljabbar Yousif |
| author_facet | Shimal Khalid Mero Dilshad Abdul Jabbar Haleem Ali Abduljabbar Yousif |
| author_sort | Shimal Khalid Mero |
| collection | DOAJ |
| description | A piano key weir (PKW) is a modified version of non-linear weirs and it can be obtained via amending the centerline length of the weir by a small footprint. It is developed to increase the hydraulic performance of the linear weirs via increasing the pass discharge and the energy dissipation. A laboratory investigation is conducted on five physical PKW (Type A) models to investigate the effect of inlet to outlet width ratio (Wi/Wo) on the hydraulic performance of PKWs. The results showed that the (Wi/Wo) ratio has a predominant influence on the hydraulic performance of PKW. It was found out that the best hydraulic performance was obtained with Wi/Wo ratio equal to 1.25 among other investigated Wi/Wo ratios because the discharge coefficient was the highest for the given discharge and head. Further, the results revealed that the variation of Wi/Wo ratio from 1.25 had a negative impact on both discharge coefficient and efficiency. It was found out that the percentages of reduction in discharge coefficient when Wi/Wo=0.8, 1, 1.5% and 2 were 11%, 6%, 2% and 8%, respectively in comparison with the Wi/Wo=1.25. Similarly, for these Wi/Wo ratios, the percentages of reduction in discharge decrease by 11%, 6.5%, 2.35% and 9%, respectively, relatively to Wi/Wo=1.25. The linear regression equations' coefficients for the PKW models varied from 0.983 to 0.994, which means the performance of the models are good for the given Wi/Wo ratios. HIGHLIGHTS
The study was conducted in a laboratory that has a big open channel, which means the physical model scale is preferable by hydraulic community.;
Merging the piano key weir within the existing spillway structure in the dams becomes a necessary action to be performing since the flash flood increased due to the climate change. This aids enhancement.; |
| first_indexed | 2024-04-12T07:43:37Z |
| format | Article |
| id | doaj.art-be527000bd5846bda271d3d3154aaf1c |
| institution | Directory Open Access Journal |
| issn | 1751-231X |
| language | English |
| last_indexed | 2024-04-12T07:43:37Z |
| publishDate | 2022-06-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Practice and Technology |
| spelling | doaj.art-be527000bd5846bda271d3d3154aaf1c2022-12-22T03:41:45ZengIWA PublishingWater Practice and Technology1751-231X2022-06-011761273128310.2166/wpt.2022.055055The influence of inlet to outlet width ratio on The hydraulic performance of piano key weir (PKW-type A)Shimal Khalid Mero0Dilshad Abdul Jabbar Haleem1Ali Abduljabbar Yousif2 Water Resources Engineering Department, College of Engineering, University of Duhok, Duhok, Kurdistan Region, Iraq Water Resources Engineering Department, College of Engineering, University of Duhok, Duhok, Kurdistan Region, Iraq Water Resources Engineering Department, College of Engineering, University of Duhok, Duhok, Kurdistan Region, Iraq A piano key weir (PKW) is a modified version of non-linear weirs and it can be obtained via amending the centerline length of the weir by a small footprint. It is developed to increase the hydraulic performance of the linear weirs via increasing the pass discharge and the energy dissipation. A laboratory investigation is conducted on five physical PKW (Type A) models to investigate the effect of inlet to outlet width ratio (Wi/Wo) on the hydraulic performance of PKWs. The results showed that the (Wi/Wo) ratio has a predominant influence on the hydraulic performance of PKW. It was found out that the best hydraulic performance was obtained with Wi/Wo ratio equal to 1.25 among other investigated Wi/Wo ratios because the discharge coefficient was the highest for the given discharge and head. Further, the results revealed that the variation of Wi/Wo ratio from 1.25 had a negative impact on both discharge coefficient and efficiency. It was found out that the percentages of reduction in discharge coefficient when Wi/Wo=0.8, 1, 1.5% and 2 were 11%, 6%, 2% and 8%, respectively in comparison with the Wi/Wo=1.25. Similarly, for these Wi/Wo ratios, the percentages of reduction in discharge decrease by 11%, 6.5%, 2.35% and 9%, respectively, relatively to Wi/Wo=1.25. The linear regression equations' coefficients for the PKW models varied from 0.983 to 0.994, which means the performance of the models are good for the given Wi/Wo ratios. HIGHLIGHTS The study was conducted in a laboratory that has a big open channel, which means the physical model scale is preferable by hydraulic community.; Merging the piano key weir within the existing spillway structure in the dams becomes a necessary action to be performing since the flash flood increased due to the climate change. This aids enhancement.;http://wpt.iwaponline.com/content/17/6/1273discharge coefficientenergy dissipationhydraulic structurespiano key weirweirs |
| spellingShingle | Shimal Khalid Mero Dilshad Abdul Jabbar Haleem Ali Abduljabbar Yousif The influence of inlet to outlet width ratio on The hydraulic performance of piano key weir (PKW-type A) Water Practice and Technology discharge coefficient energy dissipation hydraulic structures piano key weir weirs |
| title | The influence of inlet to outlet width ratio on The hydraulic performance of piano key weir (PKW-type A) |
| title_full | The influence of inlet to outlet width ratio on The hydraulic performance of piano key weir (PKW-type A) |
| title_fullStr | The influence of inlet to outlet width ratio on The hydraulic performance of piano key weir (PKW-type A) |
| title_full_unstemmed | The influence of inlet to outlet width ratio on The hydraulic performance of piano key weir (PKW-type A) |
| title_short | The influence of inlet to outlet width ratio on The hydraulic performance of piano key weir (PKW-type A) |
| title_sort | influence of inlet to outlet width ratio on the hydraulic performance of piano key weir pkw type a |
| topic | discharge coefficient energy dissipation hydraulic structures piano key weir weirs |
| url | http://wpt.iwaponline.com/content/17/6/1273 |
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