Water‐Table Visualization of Flow‐Induced Pressure Oscillations in Shallow Cavities for Simulated Supersonic Flow Conditions

1974 ◽  
Vol 55 (2) ◽  
pp. 439-439
Author(s):  
Hanno H. Heller ◽  
Sheila E. Widnall ◽  
William Jones
Keyword(s):  
Supersonic Flow ◽  
Water Table ◽  
Flow Conditions ◽  
Pressure Oscillations ◽  
Shallow Cavities

scholarly journals Laboratory Analysis of a Piston-Actuated Pressure Reducing Valve under Low Flow Conditions

Proceedings ◽  
2019 ◽  
Vol 48 (1) ◽  
pp. 26
Author(s):  
Riccardo Zarbo ◽  
Valentina Marsili ◽  
Stefano Alvisi ◽  
Marco Franchini
Keyword(s):  
Laboratory Test ◽  
Flow Rate ◽  
Water Distribution ◽  
Distribution Networks ◽  
Low Flow ◽  
Pressure Management ◽  
Flow Conditions ◽  
Pressure Oscillations ◽  
Test Set ◽  
Pressure Reducing Valve

Pressure reducing valves (PRVs) effectiveness for water distribution networks’ (WDNs’) optimal pressure management is proven, but problems and operational limitations have been highlighted by some recent studies. In this work, the functioning of a piston-actuated pressure reducing valve (PA-PRV), subjected to low flow regimes, is investigated by means of a laboratory test set. The results obtained highlight that the PA-PRV tends not to respect the imposed set-point value, and can present an unstable behaviour, characterised by significant pressure oscillations under some flow-rate conditions.

Flow-induced pressure oscillations in shallow cavities

1971 ◽  
Vol 18 (4) ◽  
pp. 545-553 ◽  
Author(s):  
H.H. Heller ◽  
D.G. Holmes ◽  
E.E. Covert
Keyword(s):  
Pressure Oscillations ◽  
Shallow Cavities

scholarly journals Behavior of a shallow water table under periodic flow conditions

2009 ◽  
Vol 45 (3) ◽  
Author(s):  
Nick Cartwright ◽  
Peter Nielsen ◽  
Pierre Perrochet
Keyword(s):  
Shallow Water ◽  
Water Table ◽  
Periodic Flow ◽  
Flow Conditions ◽  
Shallow Water Table

scholarly journals Supersonic Cascade Interaction

1974 ◽  
Author(s):  
H. J. Lichtfuss ◽  
H. Starken
Keyword(s):  
Exact Solution ◽  
Supersonic Flow ◽  
Flat Plate ◽  
Constant Velocity ◽  
Flow Conditions ◽  
Inlet Flow ◽  
Flow Adjustment ◽  
Outlet Flow ◽  
Quantitative Results ◽  
Cascade Interaction

The supersonic flow adjustment between two interacting blade rows is predicted theoretically. One of both cascades may have a constant velocity in the circumferential direction. The calculation is carried out in a quasi-stationary manner. This represents an exact solution if the constant inlet and outlet flow conditions are solely under the scope of view. Admitting the above assumptions it is possible to calculate the uniform outlet flow of the first and the associated inlet flow of the second cascade as a function of the circumferential velocity. Quantitative results are presented for flat plate cascades. However, the method is not at all restricted to these simple cases.

Mitigation of pressure oscillations induced by supersonic flow over slender cavities

1992 ◽  
Vol 29 (6) ◽  
pp. 999-1004 ◽  
Author(s):  
R. A. Smith ◽  
E. Gutmark ◽  
K. C. Schadow
Keyword(s):  
Supersonic Flow ◽  
Pressure Oscillations

scholarly journals Some properties of Dagan’s method for drain spacing determination in marshy - gley soil

2003 ◽  
Vol 48 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Nevenka Djurovic ◽  
Ruzica Stricevic
Keyword(s):  
Steady State ◽  
Linear Function ◽  
Water Flow ◽  
Water Table ◽  
Drainage System ◽  
Water Table Depth ◽  
Flow Conditions ◽  
Drain Spacing ◽  
State Water ◽  
Dry Out

Dagan?s method as well as Kirkham?s one belong to the group of methods for drain spacing determination in steady state water flow conditions. Both methods are based on the assumption that drainage spacing (L) is linear function of water table depth and drainage discharge (h/q). The only difference can be distinguished in the values of coefficients. To dry out eugley type of soil, drain spacing is better determined by Dagan?s method in all treatments, as compared with Kirkham?s one. Advantage of this method is especially marked on the drainage system with narrower drain spacing.

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