Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic Pressure

The effects of changes in the angle of pool impact plate, plunging depth, and discharge upon the dynamic pressure caused by ski-jump buckets were investigated in the laboratory. Four impact plate angles and four plunging depths were used. Discharges of 67, 86, 161, and 184 L/s were chosen. For any d...

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Main Authors:	Mehdi Karami Moghadam, Ata Amini, Marlinda Abdul Malek, Thamer Mohammad, Hasan Hoseini
Format:	Article
Language:	English
Published:	MDPI AG 2019-08-01
Series:	Water
Subjects:	jet falling energy dissipation surface disturbances pressure fluctuations water jet physical modeling
Online Access:	https://www.mdpi.com/2073-4441/11/8/1687

id	doaj-3df97ccbe6b94391ac4dbcd980ac6b83
record_format	Article
spelling	doaj-3df97ccbe6b94391ac4dbcd980ac6b832020-11-25T01:34:57ZengMDPI AGWater2073-44412019-08-01118168710.3390/w11081687w11081687Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic PressureMehdi Karami Moghadam0Ata Amini1Marlinda Abdul Malek2Thamer Mohammad3Hasan Hoseini4Department of Agriculture, Payame Noor University (PNU), Tehran 19395-4697, IranKurdistan Agricultural and Natural Resources Research and Education Center, AREEO, Sanandaj 6616949688, IranInstitute of Sustainable Energy, Universiti Tenaga Nasional, Selangor 43000, MalaysiaDepartment of Water Resources Engineering, College of Engineering, University of Baghdad, Baghdad 10011, IraqFaculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz, Ahvaz 6135783151, IranThe effects of changes in the angle of pool impact plate, plunging depth, and discharge upon the dynamic pressure caused by ski-jump buckets were investigated in the laboratory. Four impact plate angles and four plunging depths were used. Discharges of 67, 86, 161, and 184 L/s were chosen. For any discharge, plunging depth and impact plate angle were regulated, and dynamic pressures were measured by a transducer. The results showed that with the increase in the ratio of drop length of the jet to its break-up length (H/L<sub>b</sub>), and with an increase in the impact plate angle, the mean dynamic pressure coefficient decreased. An inspection of the plunging depth (Y) ratio to the initial thickness of the jet (B<sub>j</sub>) revealed that when Y/B<sub>j</sub> > 3, the plunging depth of the downstream pool reduced dynamic pressure. At the angle of 60°, the dynamic pressure coefficient due to increasing in plunging depth varied from 34% to 95%.https://www.mdpi.com/2073-4441/11/8/1687jet fallingenergy dissipationsurface disturbancespressure fluctuationswater jetphysical modeling
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Mehdi Karami Moghadam Ata Amini Marlinda Abdul Malek Thamer Mohammad Hasan Hoseini
spellingShingle	Mehdi Karami Moghadam Ata Amini Marlinda Abdul Malek Thamer Mohammad Hasan Hoseini Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic Pressure Water jet falling energy dissipation surface disturbances pressure fluctuations water jet physical modeling
author_facet	Mehdi Karami Moghadam Ata Amini Marlinda Abdul Malek Thamer Mohammad Hasan Hoseini
author_sort	Mehdi Karami Moghadam
title	Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic Pressure
title_short	Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic Pressure
title_full	Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic Pressure
title_fullStr	Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic Pressure
title_full_unstemmed	Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic Pressure
title_sort	physical modeling of ski-jump spillway to evaluate dynamic pressure
publisher	MDPI AG
series	Water
issn	2073-4441
publishDate	2019-08-01
description	The effects of changes in the angle of pool impact plate, plunging depth, and discharge upon the dynamic pressure caused by ski-jump buckets were investigated in the laboratory. Four impact plate angles and four plunging depths were used. Discharges of 67, 86, 161, and 184 L/s were chosen. For any discharge, plunging depth and impact plate angle were regulated, and dynamic pressures were measured by a transducer. The results showed that with the increase in the ratio of drop length of the jet to its break-up length (H/L<sub>b</sub>), and with an increase in the impact plate angle, the mean dynamic pressure coefficient decreased. An inspection of the plunging depth (Y) ratio to the initial thickness of the jet (B<sub>j</sub>) revealed that when Y/B<sub>j</sub> > 3, the plunging depth of the downstream pool reduced dynamic pressure. At the angle of 60°, the dynamic pressure coefficient due to increasing in plunging depth varied from 34% to 95%.
topic	jet falling energy dissipation surface disturbances pressure fluctuations water jet physical modeling
url	https://www.mdpi.com/2073-4441/11/8/1687
work_keys_str_mv	AT mehdikaramimoghadam physicalmodelingofskijumpspillwaytoevaluatedynamicpressure AT ataamini physicalmodelingofskijumpspillwaytoevaluatedynamicpressure AT marlindaabdulmalek physicalmodelingofskijumpspillwaytoevaluatedynamicpressure AT thamermohammad physicalmodelingofskijumpspillwaytoevaluatedynamicpressure AT hasanhoseini physicalmodelingofskijumpspillwaytoevaluatedynamicpressure
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Physical Modeling of Ski-Jump Spillway to Evaluate Dynamic Pressure

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