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Artykuły w czasopismach na temat "TRIANGULAR LABYRINTH WEIR"
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Hussain, Ruqiya Abed, Sawsan Abdullah Hassan i Asmaa Abdul Jabbar Jamel. "Experimental Study on Flow over Triangular Labyrinth Weirs". International Journal of Design & Nature and Ecodynamics 17, nr 2 (27.04.2022): 249–55. http://dx.doi.org/10.18280/ijdne.170211.
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Recently, many research studies have focused on labyrinth weirs' hydraulic performance, especially as dependent on engineering features. In the current study, the hydraulic properties of flow over labyrinth triangular weirs models (from the upper perspective) with sharp crest have been experimentally studied and compare their efficiency with suppressed rectangular weirs (conventional weirs). Twelve fiberglass models are developed for this reason and tested in a 6m in length, 30cm in width, and 40cm height in laboratory flume, nine models were constructed for triangular labyrinth weirs and three models were constructed for suppressed rectangular weirs, Three alternative heights (p=15, 20, and 25cm) were employed in this research, for each height, the vertex angle (θ) changed three times (60օ, 90օ, 120օ), and for each one of these weirs was used, seven different discharge were approved. The overall tests in this study were 84. The dimensionless parameters on which the discharge coefficient (Cd) is dependent were obtained using dimensional analysis. parameters were plotted. According to this experimental present study, as compared to linear weirs, labyrinth triangular weirs shown to be more hydraulically efficient. Also, the height of the weir (P) has effects on the discharge coefficient, where (Cd) increased with decreasing (P). Also, the vertex angle of triangular labyrinth weirs(θ) has a major influence on discharge coefficient and on weir performance, where the discharge coefficient raises when decreases the value of angle(θ), in another means, when the angle decreases gave an increase in the path of the flow, where it gave the triangular labyrinth weir with an angle of 60o the discharge coefficient reached its greatest value (2.55), followed by the weir with an angle of 90o and 120o respectively. In other words (a small vertex angle gives more length effective (Le) to the weir) and this leads to an increase in flow capacity or performance for the weir.
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Aurahman, Tara H., Jehan M. Fattah Sheikh Suleimany i Taban K. Hamad. "Determination of Discharge Coefficient for both Semicircular and Triangular Labyrinth Weirs". Polytechnic Journal 11, nr 2 (30.12.2021): 56–64. http://dx.doi.org/10.25156/ptj.v11n2y2021.pp56-64.
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A Labyrinth weir is a type of nonlinear weir folded in plan-view, with the ability to pass a large flow at low heads due to an increase in the effective length of the weir crest for a given channel width. The discharge coefficients (Cd) were experimentally determined for both semicircular and triangular labyrinth weirs of varying sidewall angles (α) under free-flow conditions using eight physical models. Dimensional analyses are conducted using the Buckingham π theorem to find the dependent and non-dependent variables. A nonlinear empirical equation was developed using (Statistical Package for the Social Sciences 22) software. The findings show that the discharge coefficient decreases with the increase of headwater to (Ht/P) for both types of labyrinth weir with different plan forms. It is found that the efficiency of the semicircular and triangular labyrinth is higher than linear weir for (Ht/P ≤ 0.45) and decreases with increasing the value of (Ht/P) due to interference of flow between the layers in downstream. The obtained results revealed that the discharge coefficient (Cd) values obtained empirically using multivariable power regression and 5th degree polynomial equations considerably agree with the experimental data, for both of the semicircular and triangular labyrinth weirs. Furthermore, the correlation coefficient R2was (0.9951) and (0.9637) using 5th degree polynomial equation, and their values were (0.9643) and (0.9274) using multivariable power regression equation for both semicircular and triangular labyrinth weir models, respectively. The results in the present study compared quite well with the predicted results of the proposed equations obtained by other investigators.
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Abbasi, Saeed, Sajjad Fatemi, Amir Ghaderi i Silvia Di Francesco. "The Effect of Geometric Parameters of the Antivortex on a Triangular Labyrinth Side Weir". Water 13, nr 1 (24.12.2020): 14. http://dx.doi.org/10.3390/w13010014.
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Side weirs are important structural measures extensively used, for instance, for regulating water levels in rivers and canals. If the length of the opening is limited, the amount of water diverted out of the channel and the effective length can be increased by applying a labyrinth side weir. The present study deals with numerical simulations regarding the hydraulic performance of a labyrinth side weir with a triangular plan in single-cycle mode. Specifically, six different types of antivortexes embedded inside it and in various hydraulic conditions at different Froude numbers are analyzed. The antivortexes are studied using two groups, permeable and impermeable, with three different heights: 0.5 P, 0.75 P, and 1 P (P: Weir height). The comparison of the simulated water surface profiles with laboratory results shows that the numerical model is able to capture the flow characteristics on the labyrinth side weir. The use of an antivortex in a triangular labyrinth side weir reduces the secondary flows due to the interaction with the transverse vortexes of the vertical axis and increases the discharge capacity by 11%. Antivortexes in a permeable state outperform those in an impermeable state; the discharge coefficient in the permeable state increases up to 3% with respect to the impermeable state. Finally, based on an examination of the best type of antivortex, taking into account shape, permeability, and height, the discharge coefficient increases to 13.4% compared to a conventional labyrinth side weir.
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Ghaderi, Amir, Rasoul Daneshfaraz, Mehdi Dasineh i Silvia Di Francesco. "Energy Dissipation and Hydraulics of Flow over Trapezoidal–Triangular Labyrinth Weirs". Water 12, nr 7 (14.07.2020): 1992. http://dx.doi.org/10.3390/w12071992.
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In this work experimental and numerical investigations were carried out to study the influence of the geometric parameters of trapezoidal–triangular labyrinth weirs (TTLW) on the discharge coefficient, energy dissipation, and downstream flow regime, considering two different orientations in labyrinth weir position respective to the reservoir discharge channel. To simulate the free flow surface, the volume of fluid (VOF) method, and the Renormalization Group (RNG) k-ε model turbulence were adopted in the FLOW-3D software. The flow over the labyrinth weir (in both orientations) is simulated as a steady-state flow, and the discharge coefficient is validated with experimental data. The results highlighted that the numerical model shows proper coordination with experimental results and also the discharge coefficient decreases by decreasing the sidewall angle due to the collision of the falling jets for the high value of H/P (H: the hydraulic head, P: the weir height). Hydraulics of flow over TTLW has free flow conditions in low discharge and submerged flow conditions in high discharge. TTLW approximately dissipates the maximum amount of energy due to the collision of nappes in the upstream apexes and to the circulating flow in the pool generated behind the nappes; moreover, an increase in sidewall angle and weir height leads to reduced energy. The energy dissipation of TTLW is largest compared to vertical drop and has the least possible value of residual energy as flow increases.
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Rustiati, N. B., M. G. Ishak, A. Tanga i Z. G. Pali. "Influence of The Number of Trapezoidal Labyrinth Weir Cycles on The Hydraulic Characteristics of The Weir". IOP Conference Series: Earth and Environmental Science 1157, nr 1 (1.04.2023): 012051. http://dx.doi.org/10.1088/1755-1315/1157/1/012051.
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Abstract The labyrinth weir that is viewed from above has a zig-zag shape. The main objective is to extend the spillway so that the water level upstream of the weir is as low as possible or to increase the discharge capacity. The shapes of labyrinth weirs based upon cycle shape are triangular, trapezoidal, and rectangular. However, besides the shape of the spillway, several parameters affect its hydraulic characteristics. Therefore, this paper intends to explore the effect of the number of cycles on the trapezoidal labyrinth weir on the hydraulic characteristics of the weir, based on an experimental study. There are two types of model tests one-cycle and two-cycle. Both of the models have a 2300 mm length of the spillway and were made of fiber cement board with a thickness of 20 mm and tested in a rectangular flume of 950 mm width, under various discharges to fulfill the goals of this study. The results of this study show that the discharge capacity through a one-cycle model (0.0064m3/s to 0.0150 m3/s) has a larger capacity than that of a two-cycle model (0.0023m3/s to 0.0095 m3/s). Analyzing can determine that the most efficient hydraulically are the less cycle number of labyrinth weir.
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Karimi, Sohrab, Hossein Bonakdari i Azadeh Gholami. "Determination Discharge Capacity of Triangular Labyrinth Side Weir Using Multi-Layer Neural Network (ANN-MLP)". Current World Environment 10, Special-Issue1 (28.06.2015): 111–19. http://dx.doi.org/10.12944/cwe.10.special-issue1.16.
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statistic indexes have been used to assess the accuracy of the results. The results of the examinations indicate that using MLP model along with simultaneous use of dimensionless parameters for the purposes of estimating discharge coefficient: the ratio of water behind the weir to the channel width (h/b), ratio of weir crest length to weir height (L/W), relative Froude number (F=V/√(2Side weirs are used in open channels to control flood and the flow passing through it. Discharge capacity is one of the crucial hydraulic parameters of side weirs. The aim of this study is to determine the effect of the intended dimensionless parameters on predicting the discharge coefficient of triangular labyrinth side weir. MAPE, RMSE, and Rgy)) and vertex angle (ϴ), offered the best results (MAPE= 0.67, R2= 0.99, RMSE = 0.009) in comparison with other models.
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Li, Shicheng, James Yang i Anders Ansell. "Evaluation of Pool-Type Fish Passage with Labyrinth Weirs". Sustainability 14, nr 3 (18.01.2022): 1098. http://dx.doi.org/10.3390/su14031098.
Pełny tekst źródłaStreszczenie:
Due to the construction of dams and sluices, habitat fragmentation of riverine species is an issue of concern in hydropower projects. An artificial fishway aims to restore flow connectivity and facilitate migration. As an alternative to the conventional layout with straight walls, labyrinth layouts are introduced, consisting of either triangular, trapezoidal, or rectangular weirs. Three-dimensional CFD simulations are performed to examine their influences on the fishway hydraulics. The labyrinth layouts exhibit an appreciable three-dimensional flow structure in a pool, featuring flow fluctuations in both cross- and along-channel directions, which is indicative of the potential for multiple species with distinct swimming preferences. The streamwise reduction in mean flow velocity is correlated with the Froude number, with the labyrinth weirs leading to a somewhat lower reduction than the conventional one. The dimensionless pool water depth declines with specific flow discharge. The turbulence kinetic energy is the lowest in the triangular layout and the vorticity in the conventional one. Among the labyrinth layouts, the differences in volumetric power dissipation are small. An equation is developed for dissipation estimation. All the labyrinth layouts generate higher energy loss than the conventional one. With optional weir configurations, the findings provide reference for engineering design.
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Seyedjavad, Minasadat, Seyed Taghi Omid Naeeni i Mojtaba Saneie. "Laboratory Investigation on Discharge Coefficient of Trapezoidal Piano Key Side Weirs". Civil Engineering Journal 5, nr 6 (23.06.2019): 1327–40. http://dx.doi.org/10.28991/cej-2019-03091335.
Pełny tekst źródłaStreszczenie:
A spillway is a hydraulic structure used to provide the controlled release of surplus waters and floods from a dam into a downstream area. A side weir is a multipurpose hydraulic structure which is constructed in water conveyance systems with a height lower than that of the canal wall. When the water surface level goes up, the side weir regulates the discharge and controls the water surface in the main canal. Besides, the side weir controls and diverts floods in dam reservoirs, diverts the flow and protects the structure against the river inundations. In this research, a laboratory investigation is performed with 16 Type-A piano key weirs and three different pier heights of 10, 15 and 20cm. These weirs are studied for two cases of 1 and 2. The results show that the weirs with 15cm and 20cm heights in both cases 1 and 2 have the highest discharge coefficient in dimensionless ratios of 0.2> H/P> 0.4 and H/P>0.5 respectively. Having reviewed previous studies, it could be concluded that the trapezoidal piano key side weir is capable of releasing a flow 1.2 times more than that of the linear trapezoidal labyrinth weir with 12 degrees angle and 1.87 times more than the one with 6 degrees angle, and 1.5 times more than that of the triangular labyrinth weir.
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Carollo, Francesco Giuseppe, Vito Ferro i Vincenzo Pampalone. "Testing the Outflow Process over a Triangular Labyrinth Weir". Journal of Irrigation and Drainage Engineering 143, nr 8 (sierpień 2017): 06017007. http://dx.doi.org/10.1061/(asce)ir.1943-4774.0001198.
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Bijankhan, Mohammad, i Vito Ferro. "Dimensional analysis and stage-discharge relationship for weirs: a review". Journal of Agricultural Engineering 48, nr 1 (17.02.2017): 1–11. http://dx.doi.org/10.4081/jae.2017.575.
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Deducing the weir flow stage-discharge relationship is a classical hydraulic problem. In this regard Buckingham’s theorem of dimensional analysis can be used to find simple and accurate formulas to obtain the rating curves of different weir types. At first, in this review paper the rectangular weir that is a very common hydraulic structure is studied. It is indicated that the crest shape, approach channel width, obliquity (angle between the weir crest and the direction normal to the flow motion) and vertical inclination (pivot weir) are the key-parameters affecting the flow over the rectangular weirs. The flow over the triangular, labyrinth, parabolic, circular, elliptical, and W-weirs are also studied using dimensional analysis and incomplete self-similarity concept. For all mentioned weirs the stage-discharge relationships are presented and the application limits are discussed. The results of this paper can be used and implemented by the irrigation and drainage network designers to simplify the procedure of weir design.
Rozprawy doktorskie na temat "TRIANGULAR LABYRINTH WEIR"
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KAUSHAL. "ANALYSIS OF FLOW OVER TRIANGULAR (PLANFORM) LABYRINTH WEIR MODELS". Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16765.
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In this project, analysis of flow over different models of triangular labyrinth weir is done with the help of ANSYS (Fluent) software. Different weir geometries are designed and analysed under similar condition to determine the optimum geometry among the tested ones. The need for labyrinth weir arises at the places where the width of channel is less and discharge increases. In the case of limited width, a straight weir causes the increase in the reservoir’s water level which consequently leads to a greater area of submergence. To avoid this head upstream, which can cause much damage, the labyrinth weir was developed.
The objective here is to reduce the upstream head of triangular labyrinth weir and obtain a relationship between increasing or reducing head with respect to side angle α, effective length L and cycle of weir N. The numerical modelling of a Triangular labyrinth weir is done with the help of ANSYS and the pressure distribution, velocity contour, and depths of flow is studied using contour maps which shows the variable distributions at upstream and downstream of the weir. Total 9 models are designed in ANSYS fluent and all models are simulated under same conditions i.e. same discharge and same channel width and length. Due to different crest lengths, weirs behaved slightly different and H is obtained for each case. The coefficient of discharge is calculated to differentiate in efficiency of different weirs. Also, some non-dimensional parameters are calculated to compare with previous trends.
Części książek na temat "TRIANGULAR LABYRINTH WEIR"
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Nekooie, M., A. Parvaneh i A. Kabiri-Samani. "Determination of discharge coefficient of triangular labyrinth side weirs with one and two cycles using the nonlinear PLS method". W Sustainable Hydraulics in the Era of Global Change, 653–57. CRC Press, 2016. http://dx.doi.org/10.1201/b21902-110.
Pełny tekst źródłaStreszczenia konferencji na temat "TRIANGULAR LABYRINTH WEIR"
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Dogu, Yahya, Mustafa C. Sertçakan, Koray Gezer, Mustafa Kocagül, Ercan Arıcan i Murat S. Ozmusul. "Labyrinth Seal Leakage Degradation due to Various Types of Wear". W ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57944.
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This paper systematically presents a complete leakage comparison for various types of wear experienced by labyrinth seals. Labyrinth seals used in turbine engines are designed to work at a clearance during steady-state engine operations. The tooth tip rubs the stator and wears either itself or the stator surface during transient operations, depending on the material properties of the tooth and stator. Any type of wear that increases clearance or deforms the tooth tip will cause permanent and unpredictable leakage degradation. This negatively affects the engine’s overall efficiency, durability, and life. The teeth have been reported to wear into a mushroom profile or into a rounded profile. A rub-groove on the opposing surface may form in several shapes. Based on a literature survey, five rub-groove shapes are considered in this work. They are: rectangle, trapezoid (isosceles and acute), triangle, and ellipse. In this work, leakage degradation due to wear is numerically quantified for both mushroomed and rounded tooth wear profiles. It also includes analyses on rounded teeth with the formation of five rub-groove shapes. All parameters are analyzed at various operating conditions (clearance, pressure ratio, number of teeth, rotor speed). CFD analyses are carried out by employing compressible turbulent flow in a 2-D axi-symmetrical coordinate system. CFD analyses show that the following tooth-wear conditions affect leakage from least to greatest: unworn, rounded, and mushroomed. These are for an unworn flat stator. It is also observed that rub-groove shapes considerably affect the leakage depending on the clearance. Leakage increases with the following groove profiles: triangular, rectangular, acute trapezoidal, isosceles trapezoidal, and elliptical. The results show that any type of labyrinth seal wear has significant effects on leakage. Therefore, leakage degradation due to wear should be considered during the engine design phase.
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SADEGHIAN, HADI, ALI PARVANEH, MOHAMMAD A. NEKOOIE i MOHAMMAD PARVANEH. "DISCHARGE CHARACTERISTICS OF TRIANGULAR LABYRINTH SIDE WEIRS (WITH INCLINED BED) LOCATED ON A STRAIGHT CHANNEL". W 38th IAHR World Congress. The International Association for Hydro-Environment Engineering and Research (IAHR), 2019. http://dx.doi.org/10.3850/38wc092019-0155.
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