Physical modeling of ski-jump spillway to evaluate dynamic pressure

Mehdi Karami Moghadam, Ata Amini, Marlinda Abdul Malek, Thamer Mohammad, Hasan Hoseini

Research output: Contribution to journalArticle

Abstract

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/Lb), 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 (Bj) revealed that when Y/Bj > 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%.

Original languageEnglish
Article number1687
JournalWater (Switzerland)
Volume11
Issue number8
DOIs
Publication statusPublished - 01 Aug 2019

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Ski jumps
Spillways
spillway
Pressure
modeling
Transducers
buckets
transducers (equipment)
transducer
Inspection

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Geography, Planning and Development
  • Aquatic Science
  • Water Science and Technology

Cite this

Moghadam, Mehdi Karami ; Amini, Ata ; Abdul Malek, Marlinda ; Mohammad, Thamer ; Hoseini, Hasan. / Physical modeling of ski-jump spillway to evaluate dynamic pressure. In: Water (Switzerland). 2019 ; Vol. 11, No. 8.
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Physical modeling of ski-jump spillway to evaluate dynamic pressure. / Moghadam, Mehdi Karami; Amini, Ata; Abdul Malek, Marlinda; Mohammad, Thamer; Hoseini, Hasan.

In: Water (Switzerland), Vol. 11, No. 8, 1687, 01.08.2019.

Research output: Contribution to journalArticle

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T1 - Physical modeling of ski-jump spillway to evaluate dynamic pressure

AU - Moghadam, Mehdi Karami

AU - Amini, Ata

AU - Abdul Malek, Marlinda

AU - Mohammad, Thamer

AU - Hoseini, Hasan

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AB - 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/Lb), 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 (Bj) revealed that when Y/Bj > 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%.

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