Threshold criteria for jet flipping below a sluice gate

In this project, the threshold criteria for jet-flipping below a sluice gate, on non-cohesive and uniform sediment beds, are explored. All experimental runs were conducted with an apron at both low and high submergence. Jet-flipping is a phenomenon observed when the emerging jet changes direction, f...

Full description

Saved in:
Bibliographic Details
Main Author: Wang, Cassandra Weimei
Other Authors: Lim Siow Yong
Format: Final Year Project
Language:English
Published: 2013
Subjects:
Online Access:http://hdl.handle.net/10356/52980
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-52980
record_format dspace
spelling sg-ntu-dr.10356-529802023-03-03T17:20:30Z Threshold criteria for jet flipping below a sluice gate Wang, Cassandra Weimei Lim Siow Yong School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering In this project, the threshold criteria for jet-flipping below a sluice gate, on non-cohesive and uniform sediment beds, are explored. All experimental runs were conducted with an apron at both low and high submergence. Jet-flipping is a phenomenon observed when the emerging jet changes direction, from bed jet to surface jet. It was observed that the emerging jet tends to impinge on the sand bed resulting in scour. The other jet flow investigated is the filling phase in jet-flipping,characterized by a surface jet. In this report the various observations and characteristics of the scour and filling process are described and explained in the report. In addition, the influences of certain parameters on the processes are also investigated and relations between the parameters and processes were discussed. In addition, the critical zones whereby jet-flipping phenomenon ceased to occur was charted out and discussed. It was noted that the scour process was characterized by 5 different stages and the maximum scour depth was affected by both the tailwater depth and the densimetric Froude number. Likewise, both parameters had an effect on the fill depth. The frequencies of the jet-flipping cycles were also found to be affected by the tailwater depth and densimetric Froude number. It was noted that jet-flipping cycle frequency decreases with increasing tailwater depth but increases with increasing densimetric Froude number. The critical tailwater depth and densimetric Froude number whereby jet-flipping ceased to occur was also charted out and discussed. It was discovered that the ranges whereby jet-flipping occurs were relatively constant over different discharges and a lower critical tailwater depth exists, in addition to the upper critical tailwater depth. Also, the critical tailwater depth for jet flipping was also dependent on the discharge. As discharge increases, critical tailwater depth increases. Bachelor of Engineering (Environmental Engineering) 2013-05-29T06:29:36Z 2013-05-29T06:29:36Z 2013 2013 Final Year Project (FYP) http://hdl.handle.net/10356/52980 en Nanyang Technological University 42 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering
spellingShingle DRNTU::Engineering::Civil engineering
Wang, Cassandra Weimei
Threshold criteria for jet flipping below a sluice gate
description In this project, the threshold criteria for jet-flipping below a sluice gate, on non-cohesive and uniform sediment beds, are explored. All experimental runs were conducted with an apron at both low and high submergence. Jet-flipping is a phenomenon observed when the emerging jet changes direction, from bed jet to surface jet. It was observed that the emerging jet tends to impinge on the sand bed resulting in scour. The other jet flow investigated is the filling phase in jet-flipping,characterized by a surface jet. In this report the various observations and characteristics of the scour and filling process are described and explained in the report. In addition, the influences of certain parameters on the processes are also investigated and relations between the parameters and processes were discussed. In addition, the critical zones whereby jet-flipping phenomenon ceased to occur was charted out and discussed. It was noted that the scour process was characterized by 5 different stages and the maximum scour depth was affected by both the tailwater depth and the densimetric Froude number. Likewise, both parameters had an effect on the fill depth. The frequencies of the jet-flipping cycles were also found to be affected by the tailwater depth and densimetric Froude number. It was noted that jet-flipping cycle frequency decreases with increasing tailwater depth but increases with increasing densimetric Froude number. The critical tailwater depth and densimetric Froude number whereby jet-flipping ceased to occur was also charted out and discussed. It was discovered that the ranges whereby jet-flipping occurs were relatively constant over different discharges and a lower critical tailwater depth exists, in addition to the upper critical tailwater depth. Also, the critical tailwater depth for jet flipping was also dependent on the discharge. As discharge increases, critical tailwater depth increases.
author2 Lim Siow Yong
author_facet Lim Siow Yong
Wang, Cassandra Weimei
format Final Year Project
author Wang, Cassandra Weimei
author_sort Wang, Cassandra Weimei
title Threshold criteria for jet flipping below a sluice gate
title_short Threshold criteria for jet flipping below a sluice gate
title_full Threshold criteria for jet flipping below a sluice gate
title_fullStr Threshold criteria for jet flipping below a sluice gate
title_full_unstemmed Threshold criteria for jet flipping below a sluice gate
title_sort threshold criteria for jet flipping below a sluice gate
publishDate 2013
url http://hdl.handle.net/10356/52980
_version_ 1759857044938031104