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Artykuły w czasopismach na temat „VERTICAL SLUICE GATE”

Autor: Grafiati

Data publikacji: 11 września 2023

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Sprawdź 15 najlepszych artykułów w czasopismach naukowych na temat „VERTICAL SLUICE GATE”.

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Defina, Andrea, i Francesca Maria Susin. "Hysteretic behavior of the flow under a vertical sluice gate". Physics of Fluids 15, nr 9 (31.07.2003): 2541–48. http://dx.doi.org/10.1063/1.1596193.

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Xu, Bowen, i S. Samuel Li. "Underflow Curvature and Resultant Force on a Vertical Sluice Gate". Journal of Hydraulic Engineering 146, nr 4 (kwiecień 2020): 04020017. http://dx.doi.org/10.1061/(asce)hy.1943-7900.0001720.

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Ghorbani, Mohammad Ali, Farzin Salmasi, Mandeep Kaur Saggi, Amandeep Singh Bhatia, Ercan Kahya i Reza Norouzi. "Deep learning under H2O framework: A novel approach for quantitative analysis of discharge coefficient in sluice gates". Journal of Hydroinformatics 22, nr 6 (11.09.2020): 1603–19. http://dx.doi.org/10.2166/hydro.2020.003.

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Abstract Gates in dams and irrigation canals have been used for the purpose of controlling discharge or water surface regulation. To compute the discharge under a gate, discharge coefficient (Cd) should be first determined precisely. From a novel point of view, this study investigates the effect of sill shape under the vertical sluice gate on Cd using four artificial intelligence methods, which are used to estimate Cd, (i) random forest (RF), (ii) deep learning (DL), (iii) gradient boosting machine (GBM), and (iv) generalized linear model (GLM). A sluice gate along with twelve different forms of sills was fabricated and tested in the University of Tabriz, Iran. Different flow rates were considered in the hydraulic laboratory with four gate openings. As a result, a total of 180 runs could be tested. The results showed that the installation of sill under the vertical gate has a positive effect on flow discharge. Sill shapes can be characterized by their hydraulic radius (Rs). Sensitivity analysis among the dimensionless parameters proved that Rs/G (the ratio of the hydraulic radius of the sills with respect to the gate opening) has a significant role in the determination of Cd. A semi-circular sill shape has a more positive effect on the increase of Cd than the other shapes.

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Monge Gapper, Juan Gabriel, i Alberto Serrano-Pacheco. "Flow under long two-dimensional dam sluice gate using WSPH". Ingeniería 31, nr 2 (15.06.2021): 98–111. http://dx.doi.org/10.15517/ri.v31i2.45850.

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An application of the weakly compressible Smoothed Particle Hydrodynamics (WSPH) numerical method is presented here for the case of two-dimensional flow in a long channel with a partially open sluice gate. The results are compared with an analytical solution provided by shallow water equations (SWE) and available experimental data. Of particular interest is the application of this numerical method to a sluice gate case with a high ratio of channel length to depth, which tends to amplify the effects of the chosen numerical resolution. Good model congruence was observed even for relatively low vertical resolution, and the effects of the equations used to describe the boundary conditions were identified.

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Urbański, Janusz, Piotr Siwicki, Adam Kiczko, Adam Kozioł i Marcin Krukowski. "The length of the hydraulic jump on the basis of physical and numerical modeling". Annals of Warsaw University of Life Sciences – SGGW. Land Reclamation 50, nr 1 (1.03.2018): 33–42. http://dx.doi.org/10.2478/sggw-2018-0003.

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Abstract The outcomes of physical and numerical modeling of the sluice gate outflow are presented. The measured velocity distributions in verticals of a physical model were compared with results of numerical modeling, obtained using ANSYS Fluent software. The research goal was verification of suitability of the computational fluid dynamic (CFD) approach in determination of the hydraulic jump length at the outflow of the flow control structure. Studies were performed for the model of the sluice gate and stilling basin with two setups of baffle blocks: in one and two rows. The jump lengths were estimated by an analysis of vertical velocity profiles at the outflow. Two rows of baffle blocks in the stilling basin allowed to reduce the length of the hydraulic jump by 5–10%, comparing to the length with the single row of blocks. The computational fluid dynamic approach underestimated the length of the hydraulic jump by 4–7%, comparing to the physical model.

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Carvalho, Luís, Elsa Carvalho, Rui Aleixo i Maria Manuela C. L. Lima. "Experimental study of the bed morphology downstream of a sluice gate". E3S Web of Conferences 40 (2018): 03034. http://dx.doi.org/10.1051/e3sconf/20184003034.

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This work describes an experimental study based on a simplified model of a vertical sluice gate installed in a channel with a moving bed of glass spheres with 2 mm diameter. The originated scour cavity and downstream dune were studied. The influence of the apron length and the downstream tailwater depth were also analysed. Imaging techniques provided the tools to this investigation. The data acquisition and processing consisted in acquiring images of the flow and automatically process them to identify the water-sediments interface and the longitudinal profile of sediments’ bed at different instants.

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Asavanant, J., i J. M. Vanden-Broeck. "Nonlinear free-surface flows emerging from vessels and flows under a sluice gate". Journal of the Australian Mathematical Society. Series B. Applied Mathematics 38, nr 1 (lipiec 1996): 63–86. http://dx.doi.org/10.1017/s0334270000000473.

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AbstractSteady two-dimensional flows in a domain bounded below by an infinite horizontal wall and above by a semi-infinite horizontal wall, a vertical wall and a free surface are considered. The fluid is assumed to be inviscid and incompressible, and gravity is taken into account. The problem is solved numerically by series truncation. It is shown that for a given length of the vertical wall, there are two families of solutions. One family is characterized by a continuous slope at the separation point and a limiting configuration with a stagnation point and a 120° angle corner at the separation point. The other family is characterized by a stagnation point and a 90° angle corner at the separation point. Flows under a sluice gate with and without a rigid lid approximation upstream are also considered.

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Lazzarin, Tommaso, Daniele Pietro Viero, Andrea Defina i Luca Cozzolino. "Flow under vertical sluice gates: Flow stability at large gate opening and disambiguation of partial dam-break multiple solutions". Physics of Fluids 35, nr 2 (luty 2023): 024114. http://dx.doi.org/10.1063/5.0131953.

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The present paper deals with two open issues concerning the free orifice flow under vertical sluice gates, namely, the flow stability at large gate openings and the disambiguation of multiple solutions in the case of partial dam-break. The study of these problems, which are mutually connected, is based on ad hoc laboratory experiments and numerical simulations with a computational fluid dynamics model tracking the free surface with the two-phase volume of fluid method. A series of quasi-steady states is used to assess the threshold of relative gate openings that determines the passage from orifice flow to non-interacting flow; in addition, a set of dam-break experiments with partial gate opening (i.e., lower than the initial upstream water level) is performed to find reliable criteria to disambiguate multiple exact solutions supplied by the one-dimensional shallow water theory. It is found that the dependence of contraction and discharge coefficients on the relative gate opening has a dramatic impact on the stability of orifice flow at large gate openings.

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Vaheddoost, Babak, Mir Jafar Sadegh Safari i Rasoul Ilkhanipour Zeynali. "Discharge coefficient for vertical sluice gate under submerged condition using contraction and energy loss coefficients". Flow Measurement and Instrumentation 80 (sierpień 2021): 102007. http://dx.doi.org/10.1016/j.flowmeasinst.2021.102007.

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Habib, A. "STUDY OF FREE FLOW BELOW VERTICAL SLUICE GATE WITH POSITIVE STEP IN RADIAL STILLING BASIN". Egyptian Journal for Engineering Sciences and Technology 15, nr 1 (1.06.2012): 65–73. http://dx.doi.org/10.21608/eijest.2012.96712.

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Jafar, Muthanna Sadiq. "THE FRICTION RESISTANCE EFFECT ON THE HYDRAULIC JUMP LOCATION AND ENERGY DISSIPATION, A LABORATORY STUDY". Kufa Journal of Engineering 7, nr 2 (5.07.2016): 90–103. http://dx.doi.org/10.30572/2018/kje/721205.

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The location of the jump downstream the hydraulic structures outlets is an important parameter taken into considerations within the construction of the downstream protection works. One of the ways of moving the jump into a closer distance from the outlets is to raise the tail water level. In this research, a flow partitioning structure, FPS, designed, carried out, and installed downstream a sluice gate to apportion the cross sectional area of the flow and, then, increase the resistance of the friction force by increasing the walls of flow. The FPS shaped as a sectioned triangular prism consists of sets of 2.6cmÃ—2.6cm iron square-section pipes formed with direction of the flow. The FPS with a vertical front face consisting of 16Ã—11, rows Ã— columns, of pipes extended 10cm downstream and held by a 0.5cm, thickness, iron bars and welded together to prevent any egression of the pipes from the FPS. This combination of the pipes and bars made a width of 29.6cm and height of 42.6cm to fit, approximately, the flume cross sectional area dimensions. The downstream face made with an inclination of 45o to prevent the free fall of the water. The system (which consists of a sluice gate, FPS, and rising weir) installed in a horizontal flume of 0.3m width, 0.45m depth, and 15m length. The system operated with flow rates ranged from 11.11 to 36.24l/s with different gate openings in 27 tests. In each test, the hydraulic jump formed downstream the sluice gate and the FPS once placed downstream the jump and once removed, in the same test, with maintaining the same flow conditions, and measurements are taken to investigate the effect of the FPS on the jump. The results show that the additional friction resistance by the FPS increased the tail water level and forced the hydraulic jump towards the sluice gate, in which the FPS produced a converging distance ranged from 0.64m to 5.34m. This convergence of the jump lowered the head losses of the flow before the jump and then increased Froude Number, Fr, and produced higher y2/y1 value. The increased value of y2/y1 increased the energy dissipation of the jump, in which the jump produced energy dissipation ranged from 8.47 to 85.38% with the existence of the FPS instead of 5.91 to 66.14% without it, with same flow conditions. In spite of the considerable increase in the tail water level downstream the FPS, there was no significant differences of the dissipated energy with and without the FPS for the whole system, in which the energy dissipation ranged from 14.05 to 55.91% with the FPS and ranged from 13.57 to 55.09% without it.

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Wiryanto, L. H., i H. B. Supriyanto. "The Contraction Coefficient of a Free-Surface Flow Under Gravity Entering a Region Beneath a Semi-Infinite Plane". East Asian Journal on Applied Mathematics 2, nr 4 (listopad 2012): 342–52. http://dx.doi.org/10.4208/eajam.240912.141112a.

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Abstract.Borda's mouthpiece consists of a long straight tube projecting into a large vessel, where fluid enters the tube in a free surface flow that tends to become uniform far downstream in the tube. A two-dimensional approximation to this flow under gravity in the upper part of the tube leads to an evaluation of the contraction coefficient, the ratio of the constant depth of the uniform flow to the width of the tube. The analysis also applies to flow under gravity past a sluice gate, if the semi-infinite wall above the channel is rotated to the vertical. The contraction coefficient depends upon the Froude numberF, and is generally less than the zero gravity value of 1/2 that is approached asF→ ∞.

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Tong, Zheming, Zhongqin Yang, Qing Huang i Qiang Yao. "Numerical Modeling of the Hydrodynamic Performance of Slanted Axial-Flow Urban Drainage Pumps at Shut-Off Condition". Energies 15, nr 5 (4.03.2022): 1905. http://dx.doi.org/10.3390/en15051905.

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Increasing extreme rainfall events caused by global climate change have had a significant impact on urban drainage systems. As a critical component of a pumping station, a large-scale slanted axial-flow pump (SAFP) featuring high specific speed plays a critical role in mitigating urban flooding and waterlogging. In this study, to reveal the transient characteristics of a SAFP at shut-off conditions, a computational fluid dynamics (CFD) based approach with dynamic mesh was proposed. Multiple shut-off conditions with various shut-down speeds of the sluice gate (SG) were modeled. Our analysis demonstrated that both the shut-off conditions and the slanted structure have conspicuous impacts on the hydrodynamic performance of a SAFP. Reducing the shut-down speed leads to a greater reverse flow rate and higher runner speed. The water hammer effect was simulated with different shut-down speeds, increasing the water head by 5.07–10.42 m, the axial force by 163.46–297.06 kN∙m, and the axial moment by 116.05–224.01 kN∙m. Compared with the axial direction, moments in the radial directions were found with more obvious oscillation as a result of stronger rotor–stator interaction. Due to the gravitational effect of the slanted structure, the fluctuation of the runner in vertical direction presented an off-axis characteristic compared with the horizontal one. As the SG speed increased, pressure fluctuations gradually decreased at various locations across the SAFP.

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Salmasi, Farzin, Meysam Nouri, Parveen Sihag i John Abraham. "Application of SVM, ANN, GRNN, RF, GP and RT models for predicting discharge coefficients of oblique sluice gates using experimental data". Water Supply, 18.09.2020. http://dx.doi.org/10.2166/ws.2020.226.

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Abstract Gates are commonly used to adjust water flow in open channels. By using an oblique/inclined gate, the water transferring capacity of open irrigation canals can be increased. Investigation of free and submerged discharge coefficients for inclined sluice gates is the focus of the present study. First an experimental apparatus incorporating an inclined gate was created. The inclined angle (β) and gate opening (a) were experiment variables, and the five inclination angles include: 0° (vertical gate), 15°, 30°, 45° and 60°. Experimental results showed a greater convergence of flow lines under the gate and increasing the gate angle causes the discharge coefficient to increase. Also experiments showed that increasing the submergence rate (yt/a), decreases the inclined gate discharge coefficient. Performance metrics were created for the experimental results. The metrics utilized Gaussian process (GP) regression, Support Vector Machine (SVM), artificial neural networks (ANN), generalized regression neural network (GRNN), Random Forest (RF) regression and Random Tree (RT) based models which were used to predict discharge coefficients (Cd) in both submerged and free flow conditions. The model input parameters were the ratio of the upstream water depth to gate opening (y/a) and the inclined angle (β) for free flow and also the submergence rate (yt/a) for submerged flow. The prediction models show that the ANN model in free flow conditions has the following performance metrics: Coefficient of determination, R2= 0.9957, Root Mean Square Error (RMSE) = 0.0044, and Mean Absolute Error (MAE) = 0.0017. The performance metrics for submerged flow conditions were R2 = 0.9922, RMSE = 0.0079 and MAE = 0.0054. The ANN approach is the most accurate model compared to the others.

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Singh, Ujjawal Kumar, i Parthajit Roy. "Energy dissipation in hydraulic jumps using triple screen layers". Applied Water Science 13, nr 1 (27.11.2022). http://dx.doi.org/10.1007/s13201-022-01824-y.

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AbstractIn the present study, series of laboratory experiments were conducted to investigate the effectiveness of perforated screens as energy dissipators in mixed triple wall mode in the case of small hydraulic structures. The shapes of openings for each layer of screens were either circular, square or triangular. Every layer of the screen had a porosity of 45% per unit depth of the screen. The experiments were conducted to dissipate the energy for supercritical flows of Froude number F1 ranging from 3.2 to 19.3. The screens were placed vertically with the first screen 1.5 m from the sluice gate and consecutive screen at a gap of 25 mm. The experiments showed that the energy of the supercritical flows can be dissipated effectively by using perforated screens. The difference in energy dissipation between the upstream and downstream of the screen was more significant than the energy dissipation caused by classical hydraulic jumps. Comparing the results of the present study with the previous researchers it is found that the energy loss in case of present study more than the previous researchers. The relative energy loss in the present study was found to be varying from 74 to 94%. The value of the Froude number downstream of the screen, F2, was varying from 1.1 to 1.81, with an average value of 1.35. Tailwater deficit parameter, D, if found to be varying from 0.66 to 0.90.

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