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IMPROVED DESIGN OF A PROPORTIONAL FLOW METER
Conventional flow meters have several drawbacks which were overcome in the improved design. Geometry of the control section of the flow meter was determined theoretically in order to maintain normal depth—discharge relation upstream. Model dimensions were computed from prototype canal with a scale of 1:30. The improved flow meter has high modular limit and nearly constant coefficient of discharge under free flow condition. Conventional expansive transition provided at the outlet of the flow meter was replaced by straight expansion. Studies were made with four different lengths of expansion governed by side splays 0:1, 1:1, 2:1 and 3:1. With level bed, the hydraulic performance of expansions defined in terms of efficiency (η0) and Coriolis coefficient (α2) were found to be extremely poor. Separation of flow occurred right from the entry of the expansions resulting in highly non-uniform velocity downstream. By providing adverse slopes to the expansion floor, performance of the flow meter was found to improve remarkably. Adverse slopes were found theoretically by means of equations developed earlier by the first author. With provision of adverse slope, separation was completely eliminated and velocity distribution was highly uniform in all the cases.
IMPROVED DESIGN OF A PROPORTIONAL FLOW METER
Conventional flow meters have several drawbacks which were overcome in the improved design. Geometry of the control section of the flow meter was determined theoretically in order to maintain normal depth—discharge relation upstream. Model dimensions were computed from prototype canal with a scale of 1:30. The improved flow meter has high modular limit and nearly constant coefficient of discharge under free flow condition. Conventional expansive transition provided at the outlet of the flow meter was replaced by straight expansion. Studies were made with four different lengths of expansion governed by side splays 0:1, 1:1, 2:1 and 3:1. With level bed, the hydraulic performance of expansions defined in terms of efficiency (η0) and Coriolis coefficient (α2) were found to be extremely poor. Separation of flow occurred right from the entry of the expansions resulting in highly non-uniform velocity downstream. By providing adverse slopes to the expansion floor, performance of the flow meter was found to improve remarkably. Adverse slopes were found theoretically by means of equations developed earlier by the first author. With provision of adverse slope, separation was completely eliminated and velocity distribution was highly uniform in all the cases.
IMPROVED DESIGN OF A PROPORTIONAL FLOW METER
Mazumder, S. K. (author) / Roy, Indroniel Deb (author)
ISH Journal of Hydraulic Engineering ; 5 ; 11-21
1999-01-01
11 pages
Article (Journal)
Electronic Resource
Unknown
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