Discharge coefficient for vertical sluice gate under submerged condition using contraction and energy loss coefficients

2021 ◽  
pp. 102007
Author(s):  
Babak Vaheddoost ◽  
Mir Jafar Sadegh Safari ◽  
Rasoul Ilkhanipour Zeynali
Keyword(s):  
Energy Loss ◽  
Discharge Coefficient ◽  
Submerged Condition ◽  
Sluice Gate ◽  
Loss Coefficients

Effective energy-loss coefficients in the vibration of rod structures

2015 ◽  
Vol 35 (10) ◽  
pp. 737-739
Author(s):  
A. N. Chukarin ◽  
A. P. Sychev ◽  
S. F. Podust
Keyword(s):  
Energy Loss ◽  
Effective Energy ◽  
Loss Coefficients ◽  
Rod Structures

scholarly journals Physical modelling of energy losses at surcharged three-way junction manholes in drainage system

2021 ◽  
Author(s):  
Q. Li ◽  
J. Xia ◽  
M. Zhou ◽  
S. Deng ◽  
H. Zhang ◽  
...  
Keyword(s):  
Energy Loss ◽  
Flow Structure ◽  
Water Depth ◽  
Drainage System ◽  
Physical Modelling ◽  
Head Loss ◽  
Geometrical Parameters ◽  
Flow Discharge ◽  
Discharge Ratio ◽  
Loss Coefficients

Abstract Motivated by the observation that vortex flow structure was evident in the energy loss at the surcharged junction manhole due to changes of hydraulic and geometrical parameters, a physical model was used to calculate energy loss coefficients and investigate the relationship between flow structure and energy loss at the surcharged three-way junction manhole. The effects of the flow discharge ratio, the connected angle between two inflow pipes, the manhole geometry, and the downstream water depth on the energy loss were analyzed based on the quantified energy loss coefficients and the identified flow structure. Moreover, two empirical formulae for head loss coefficients were validated by the experimental data. Results indicate that the effect of flow discharge ratio and connected angle are significant, while the effect of downstream water depth is not obvious. With the increase of the lateral inflow discharge, the flow velocity distribution and vortex structure are both enhanced. It is also found that a circular manhole can reduce local energy loss when compared to a square manhole. In addition, the tested empirical formulae can reproduce the trend of total head loss coefficient.

The Development of Axial Turbine Leakage Loss for Two Profiled Tip Geometries Using Linear Cascade Data

1992 ◽  
Vol 114 (1) ◽  
pp. 198-203 ◽  
Author(s):  
J. P. Bindon ◽  
G. Morphis
Keyword(s):  
Discharge Coefficient ◽  
Separation Bubble ◽  
Tip Clearance ◽  
Loss Reduction ◽  
Analysis Method ◽  
Leakage Loss ◽  
Linear Cascade ◽  
Blade Tip ◽  
Loss Coefficients ◽  
Internal Gap

To assess the possibility of tip clearance loss reduction and to explore the nature and origin of tip clearance loss, blade tip geometries that reduce the roughly 40 percent of total loss occurring within the gap were studied. The shapes investigated aimed at reducing or avoiding the gap separation bubble thought to contribute significantly to both internal gap loss and to the endwall mixing loss. It was found that radiusing and contouring the blade at gap inlet eliminated the separation bubble and reduced the internal gap loss but created a higher mixing loss to give almost unchanged overall loss coefficients when compared with the simple sharp-edged flat-tipped blade. The separation bubble does not therefore appear to influence the mixing loss. Using a method of assessing linear cascade experimental data as though it were a rotor with work transfer, one radiused geometry, contoured to shed radial flow into the gap and reduce the leakage mass flow, was found to have a significantly higher efficiency. This demonstrates the effectiveness of the data analysis method and that cascade loss coefficient alone or gap discharge coefficient cannot be used to evaluate tip clearance performance accurately. Contouring may ultimately lead to better rotor blade performances.

scholarly journals Model of discharge coefficient of crest gate rubber weir at fully closed condition

2021 ◽  
Vol 930 (1) ◽  
pp. 012026
Author(s):  
A R Wibowo ◽  
M Bisri ◽  
Sumiadi ◽  
V Dermawan
Keyword(s):  
Laboratory Experiment ◽  
Flow Resistance ◽  
Discharge Coefficient ◽  
Metal Plate ◽  
Hydraulic Model ◽  
Structural Form ◽  
Sluice Gate ◽  
Upstream Side ◽  
Unique Shape ◽  
Made In

Abstract Crest Gate Rubber Weir is a modification of rubber weir with adding a metal plate or crest gate on the upstream side. The rubber in this weir functioning as a support while the crest gate serves on elevating water. Although many have been implemented, this weir’s discharge coefficient needs be researched considering its unique shape. This study looks for discharge coefficient to determine the discharge that passes through weirs at fully closed conditions. The research was conducted with a hydraulic model resembling part of Tirtonadi Weir in Surakarta with a hydraulic model. The model is made in an angle 53°, which represents the prototype at fully closed condition. Laboratory experiment shows that the discharge coefficient of this weir is greater than the Ogee Weir and Sluice Gate for the same height because of less flow resistance from this weir structural form.

scholarly journals Discharge Coefficients for Sluice Gates Set in Weirs at Different Upstream Wall Inclinations

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 245 ◽  
Author(s):  
Agostino Lauria ◽  
Francesco Calomino ◽  
Giancarlo Alfonsi ◽  
Antonino D’Ippolito
Keyword(s):  
Numerical Simulations ◽  
Laboratory Experiments ◽  
Discharge Coefficient ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Navier Stokes ◽  
Closure Model ◽  
Sluice Gate ◽  
Discharge Coefficients ◽  
Shape Ratio

Laboratory experiments and numerical simulations are performed to measure discharge coefficients in the case of a gate located on the upstream wall of a weir for flood storage. The effect of the gate slope and the side contraction have been taken into account. The study was first performed experimentally, when three series of tests were carried out with (and without) a broad crested weir located under the gate, at different values of the inclination angle of the weir upstream wall, and at different values of the shape ratio and the relative opening. In order to provide useful suggestions for those involved in sluice gate construction and management, three equations were obtained based on multiple regression, relating the discharge coefficient to different parameters that characterize the phenomenon at hand, separating the case when the broad-crested weir was present. Then numerical simulations were executed by means of the Reynolds-averaged Navier–Stokes (RANS) equations with the k-ε turbulence closure model and in conjunction with the volume of fluid (VOF) method, to validate the numerical results against the experimental and to possibly investigate phenomena not caught by the experimental measurements. Simulated discharges were very close to the observed ones showing that the proposed three-dimensional numerical procedure is a favorable option to correctly reproduce the phenomenon.

Hydraulic performance of damaged-end corrugated steel pipe culverts

2008 ◽  
Vol 35 (9) ◽  
pp. 918-924 ◽  
Author(s):  
J. A. Kells
Keyword(s):  
Discharge Capacity ◽  
Discharge Coefficient ◽  
Hydraulic Structure ◽  
Hydraulic Performance ◽  
Steel Pipe ◽  
Simple Type ◽  
Thin Wall ◽  
Modes Of Operation ◽  
Hydraulic Impact ◽  
Loss Coefficients

Culverts are a common and physically simple type of hydraulic structure, which are often fabricated as circular, corrugated steel pipe (CSP) sections. Because of the relatively thin wall of CSP, the ends of such pipe are frequently in a damaged condition. It is hypothesized that the hydraulic impact of the damage is often quite significant, resulting in reduced discharge capacity and (or) increased headwater ponding. The study reported in this paper was focused on an evaluation of the hydraulic impact of various levels of damage to the end sections of a culvert operating under either inlet or outlet control. In general, it was found that, for end damage deformations up to 1/4 of the pipe diameter, the discharge coefficient is reduced by approximately 10%, while the loss coefficients are increased by about 48% and 35% for inlet and outlet control modes of operation, respectively. For greater degrees of damage, the hydraulic performance is considerably worse.

scholarly journals Energy Loss Coefficients ki in a Displacement Pump and Hydraulic Motor used in Hydrostatic Drives

2019 ◽  
Vol 26 (3) ◽  
pp. 47-55
Author(s):  
Agnieszka Maczyszyn
Keyword(s):  
Energy Efficiency ◽  
Energy Loss ◽  
Machine Design ◽  
Energy Losses ◽  
Operating Parameters ◽  
Hydraulic Motor ◽  
Mechanical Loss ◽  
Design And Manufacturing ◽  
Displacement Pump ◽  
Loss Coefficients

Abstract The article aims at defining and analysing the energy loss coefficients in design solutions of rotating displacement machines, with a piston machine as an example. The energy losses observed in these machines include mechanical loss, volumetric loss, and pressure loss. The scale and relations between these losses in different machines depend on machine design and manufacturing quality, and on operating parameters. The operating parameters, in turn, which affect directly or indirectly the above losses depend on whether the machine works in pump or hydraulic motor regime. The article is also a contribution to the development of a library of ki coefficients which define the losses in displacement machines, as the knowledge about these coefficients makes it possible to assess fast and easily the energy efficiency of a machine or drive system at each point of its working area.

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