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Добірка наукової літератури з теми "COEFFICIENTS FOR DISCHARGE"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "COEFFICIENTS FOR DISCHARGE"

1

Hong, Moongeun, Jaehyoung Jeon, and Soo Yong Lee. "Discharge Coefficient of Pressure-Swirl Atomizers with Low Nozzle Opening Coefficients." Journal of Propulsion and Power 28, no. 1 (January 2012): 213–18. http://dx.doi.org/10.2514/1.b34168.

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2

Chen, Yuejun, Zongfu Fu, Qingsheng Chen, and Zhen Cui. "Discharge Coefficient of Rectangular Short-Crested Weir with Varying Slope Coefficients." Water 10, no. 2 (February 14, 2018): 204. http://dx.doi.org/10.3390/w10020204.

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3

Mishra, P. K., Wernher Brevis, and Cornelia Lang. "Discharge Coefficients for Baffle-Sluice Gates." Journal of Irrigation and Drainage Engineering 139, no. 4 (April 2013): 336–40. http://dx.doi.org/10.1061/(asce)ir.1943-4774.0000550.

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4

Darrel M. Temple. "Discharge Coefficients for Vegetated Earth Embankments." Applied Engineering in Agriculture 4, no. 1 (1988): 53–55. http://dx.doi.org/10.13031/2013.26579.

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5

Fox, T. A., and J. Stark. "Discharge Coefficients for Miniature Fuel Injectors." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 203, no. 1 (January 1989): 75–78. http://dx.doi.org/10.1243/pime_proc_1989_203_056_01.

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This technical note presents experimentally determined discharge coefficients for miniature, sharp-edged, short-tube orifice injectors operating under quasi-steady conditions in the pre and post-hydraulic flip stages.
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6

Burm, K. T. A. L. "Calculation of the Townsend Discharge Coefficients and the Paschen Curve Coefficients." Contributions to Plasma Physics 47, no. 3 (May 2007): 177–82. http://dx.doi.org/10.1002/ctpp.200710025.

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7

Rio-Cano, Carlos, Navid M. Tousi, Josep M. Bergada, and Angel Comas. "Discharge Coefficients of a Heavy Suspension Nozzle." Applied Sciences 11, no. 6 (March 15, 2021): 2619. http://dx.doi.org/10.3390/app11062619.

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The suspensions used in heavy vehicles often consist of several oil and two gas chambers. In order to perform an analytical study of the mass flow transferred between two gas chambers separated by a nozzle, and when considering the gas as compressible and real, it is usually needed to determine the discharge coefficient of the nozzle. The nozzle configuration analyzed in the present study consists of a T shape, and it is used to separate two nitrogen chambers employed in heavy vehicle suspensions. In the present study, under compressible dynamic real flow conditions and at operating pressures, discharge coefficients were determined based on experimental data. A test rig was constructed for this purpose, and air was used as working fluid. The study clarifies that discharge coefficients for the T shape nozzle studied not only depend on the pressure gradient between chambers but also on the flow direction. Computational Fluid Dynamic (CFD) simulations, using air as working fluid and when flowing in both nozzle directions, were undertaken, as well, and the fluid was considered as compressible and ideal. The CFD results deeply helped in understanding why the dynamic discharge coefficients were dependent on both the pressure ratio and flow direction, clarifying at which nozzle location, and for how long, chocked flow was to be expected. Experimentally-based results were compared with the CFD ones, validating both the experimental procedure and numerical methodologies presented. The information gathered in the present study is aimed to be used to mathematically characterize the dynamic performance of a real suspension.
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8

Savage, Bruce M., Bryan Heiner, and Steven L. Barfuss. "Parshall flume discharge correction coefficients through modelling." Proceedings of the Institution of Civil Engineers - Water Management 167, no. 5 (May 2014): 279–87. http://dx.doi.org/10.1680/wama.12.00112.

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9

Lefebvre, Arthur H., and S. Kevin Chen. "DISCHARGE COEFFICIENTS FOR PLAIN-ORIFICE EFFERVESCENT ATOMIZERS." Atomization and Sprays 4, no. 3 (1994): 275–90. http://dx.doi.org/10.1615/atomizspr.v4.i3.30.

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10

Spencer, Adrian. "Discharge Coefficients of Ports with Stepped Inlets." Aerospace 5, no. 3 (September 19, 2018): 97. http://dx.doi.org/10.3390/aerospace5030097.

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Анотація:
Components of aeronautical gas turbines are increasingly being constructed from two layers, including a pressure containing skin, which is then protected by a thermal tile. Between them, pedestals and/or other heat transfer enhancing features are often employed. This results in air admission ports through the dual skin having a step feature at the inlet. Experimental data have been captured for stepped ports with a cross flow approach, which show a marked increase of 20% to 25% in discharge coefficient due to inlet step sizes typical of combustion chamber configurations. In this respect, the step behaves in a fashion comparable to ports with inlet chamfering or radiusing; the discharge coefficient is increased as a result of a reduction in the size of the vena contracta brought about by changes to the flow at inlet to the port. Radiused and chamfered ports have been the subject of previous studies, and empirical correlations exist to predict their discharge coefficient as used in many one-dimensional flow network tools. A method to predict the discharge coefficient change due to a step is suggested: converting the effect of the step into an equivalent radius to diameter ratio available in existing correlation approaches. An additional factor of eccentricity between the hole in the two skins is also considered. Eccentricity is shown to reduce discharge coefficient by up to 10% for some configurations, which is more pronounced at higher port mass flow ingestion fraction.
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Дисертації з теми "COEFFICIENTS FOR DISCHARGE"

1

Tingey, Samuel Egnew. "Discharge Coefficients of Oblique Weirs." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1010.

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Oblique weirs are those weirs placed at an angle with respect to the channel centerline. They can be used in canal applications where more discharge is needed, but there is limited freeboard. The discharge coefficients were determined for 54 different weirs by measuring total head for various flows over each weir. These weirs included sharp, half round and quarter-round-crested weirs. There were 18 weirs for each crest shape with three weir heights for each angle tested. The oblique angles tested were 10°, 15°, 25°, 45°, 60°, and 90° with respect to the channel centerline, with the nominal weir heights being 4, 8, and 12 inches. The half-round-crested weirs were the most efficient, followed by the quarter-round-crested weirs and the sharp-crested weirs were the least efficient. By decreasing the oblique angle, the weir length became longer and the weir would be more efficient than the normal weir.
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2

Kinsman, Roger Gordon. "Outlet discharge coefficients of ventilation ducts." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59271.

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Discharge coefficients are an important parameter in the prediction of the air displacement performance of ventilation outlets and in the design of ventilation ducts.
Discharge coefficients of a wooden ventilation duct 8.54 metres in length and of a constant 0.17 m$ sp2$ cross sectional area were measured. Four different outlet shapes and 3 aperture ratios of each shape were tested. A split plot experimental design was used to evaluate the effect of outlet shape, outlet size, and distance from the fan on discharge coefficient. The relationship between duct performance characteristics and discharge coefficient was examined. A mathematical equation to predict the discharge coefficient was developed and tested.
Discharge coefficient values measured ranged from 0.19 to 1.25 depending on the aperture ratio and distance from the fan. Outlet shape had no significant effect. The apparent effects of aperture ratio and size are due to the effects of head ratio. The equation predicting the discharge coefficient had a maximum error of 5 percent for the aperture ratios of 0.5 and 1.0, and 15 percent at an aperture ratio of 1.5.
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3

Yip, C. W. H. "Compressible discharge coefficients of branching flows." Thesis, University of Aberdeen, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233007.

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A two-dimensional numerical model for compressible branching flow through a slot is described for the purpose of predicting the discharge coefficients of film cooling holes in gas turbine blades. The method employs free-streamline theory and the hodograph transformation. It calculates the area ratio of hole to duct and the contraction coefficient from a set of prescribed boundary conditions. An approximate method for calculating the compressible contraction coefficients is also discussed in the thesis. It employs the incompressible theory previously developed by McNown and Hsu (1951) for the free efflux, the 'compressibility factor' and the flow parameter (Po-Pj)/(Po-P1), where Po, Pj, P1 represent the stagnation pressure, the static pressure of the jet and the static pressure of the approach flow, respectively. The advantages of using this method are the direct input of the area ratio of hole to duct and its speed of calculation. Experimental tests were performed using a specially designed rig in a supersonic wind tunnel. The investigations included sharp-edged slots with three different widths, a single hole and a row of two holes. The approach velocity in terms of the characteristic Mach number ranged from 0.18 to 0.58 and the pressure ratio Po/Pj, ranged from 1.10 to 1.97. Agreement between the experimental data and the theoretical values was good to within the experimental accuracy (typically around +/- 5%) for the slots and the 2-hole configuration. For the 1-hole configuration, less bleed flow than predicted was observed, with the discrepancy varying from 7% to 18%. The latter case is a very severe test of a purely two-dimensional theory. The results for the 2-hole plate suggest that the slot theory can in fact be used to predict the flow through a row of holes with small pitch to diameter ratios.
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4

Rowbury, David. "Discharge coefficients of nozzle guide vane film cooling holes." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365838.

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5

Gault, R. I. "Alternative methods for determining coefficients of discharge for engine simulation." Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273271.

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6

Beauchemin, Melanie. "Investigations of nozzle discharge coefficients in a compliant air bearing system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/MQ45870.pdf.

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7

Ntamba, Ntamba Butteur Mulumba. "Non-Newtonian pressure loss and discharge coefficients for short square-edged orifices plates." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/1252.

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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2011.
Despite the extensive research work carried out on flow through short square-edged orifice plates over the last century (e.g. Johansen, 1930; Benedict, 1977; Alvi et al., 1978; Swamee, 2005; ESDU, 2007), gaps in the engineering data still exist for certain ranges of flow conditions and geometries. The majority of data available in the literature are for Newtonian fluids in the turbulent flow regime (ESDU, 2007). Insufficient data have been observed for the orifice with pipe diameter ratio, β = 0.2, in the laminar flow regime. There are no experimental data for β = 0.3 and 0.57. The objective of this thesis was to conduct wide-ranging experimental studies of the flow in orifice plates, which included those geometrical configurations, by measuring pressure loss coefficients and discharge coefficients across the orifice plates using both Newtonian fluids and non-Newtonian fluids in both laminar and turbulent flow regimes. The test work was conducted on the valve test rig at the Cape Peninsula University of Technology. Four classical circular short square-edged orifice plates having, β = 0.2, 0.3, 0.57 and 0.7, were tested. In addition, two generation 0 Von Koch orifice plates (Von Koch, 1904), with equivalent cross sectional area were also tested for β = 0.57. Water was used as Newtonian fluid to obtain turbulent regime data and also for calibration purposes to ensure measurement accuracy and carboxymethyl cellulose, bentonite and kaolin slurries were used at different concentrations to obtain laminar and transitional loss coefficient data. The hydraulic grade line method was used to evaluate pressure loss coefficients (Edwards et al., 1985), while the flange tap arrangement method was used to determine the discharge coefficients (ESDU, 2007). A tube viscometer with three different pipe diameters was used to obtain the rheological properties of the fluids. The results for each test are presented in the form of pressure loss coefficient (kor) and discharge coefficient (Cd) against pipe Reynolds number (Re)
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8

Devkota, Jay P. "Variation of Manning’s Roughness Coefficient with Diameter, Discharge, Slope and Depth in Partially Filled HDPE Culverts." Youngstown State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1340991250.

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9

Yendodu, Vishnu Vardhan Reddy. "A comprehensive database on air plasma kinetics." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25762/.

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The kinetic models described in this thesis are of great importance because they can be used to understand the chemical phenomena induced by electrical discharges in air. Experimental data obtained by the research group in the Physics Department of the University Milano Bicocca are compared with the numerical results. The study highlighted how the initial ozone formation is inhibited and cancelled by nitrogen oxidation processes. In this thesis, a comprehensive database on Air Plasma Kinetic reactions with rate coefficients is presented. The database were built from Park Model and Sakiyama Model. In both models, the references to rate coefficients vary from the real material, and not all the rate coefficients satisfy the references. The database built is made ready for implementation on ZDPlasKin software.
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10

Johnson, Michael Clyde. "Discharge Coefficient Scale Effects Analysis for Weirs." DigitalCommons@USU, 1996. https://digitalcommons.usu.edu/etd/7604.

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Much work has been published regarding discharge coefficients for various weir structures. What has not been published to the same extent are the effects of model scale associated with the weirs being studied. If laboratory weirs are too small, scale effects can affect the magnitude of the discharge coefficient. These errors may be significant if the weir serves as a control structure for an emergency spillway. It is imperative that discharge be accurately predicted to enable safe design and operation. Numerical and physical means were employed to analyze the effects of scale associated with Froude Modeling of weirs with sharp and flat crests. An inverse formulation for the ideal flow of water over a weir was developed. The formulation appeared to be sound; however, the numerical method failed because the boundary condition on the free surface had multiple roots, which were almost equal in magnitude and sign. Laboratory data were collected and analyzed to determine the existence of scale effects and the flow conditions under which they were manifested. Results indicate that scale effects are present even with relatively large model sizes (12 inches high with a crest thickness of 24 inches). The scale effects appear to be associated with the size of the weir-wall and the viscosity. Although the viscosity was not altered, the results show a characteristic Reynolds Number for a given crest thickness-to-height ratio where scale effects cease to exist for increasing total head. Several graphs defining the conditions where scale effects exist for a given weir size were developed. Use of the graphs allows one to determine the minimum total head (piezometric plus velocity head) that one may operate a given size of weir or size a weir given the minimum total head to be tested to avoid scale effects. A design curve for discharge coefficients was developed to be used for determining the capacity of prototype weirs. The curve can be used to determine the discharge coefficient for new or existing hydraulic control structures.
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Книги з теми "COEFFICIENTS FOR DISCHARGE"

1

Beauchemin, Mélanie. Investigations of nozzle discharge coefficients in a compliant air bearing system. Ottawa: National Library of Canada, 1999.

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2

Martin, C. N. B. Effects of upstream bends and valves on orifice plate pressure distributions and discharge coefficients. Glasgow: National Engineering Laboratory, 1986.

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3

R, DeBonis James, and United States. National Aeronautics and Space Administration., eds. Experimental and analytical studies of flow through a ventral and axial exhaust nozzle system for STOVL aircraft. [Washington, DC]: National Aeronautics and Space Administration, 1991.

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4

R, Whetstone James, and National Institute of Standards and Technology (U.S.), eds. Measurements of coefficients of discharge for concentric flange-tapped square-edged orifice meters in water over the Reynolds number range 600 to 2,700,000. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1989.

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5

D, Swain Eric, South Florida Water Management District (Fla.), and Geological Survey (U.S.), eds. Determining discharge-coefficient ratings for coastal structures in Dade County, Florida. Tallahassee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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6

D, Swain Eric, South Florida Water Management District., and Geological Survey (U.S.), eds. Determining discharge-coefficient ratings for coastal structures in Dade County, Florida. Tallahassee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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7

D, Swain Eric, South Florida Water Management District., and Geological Survey (U.S.), eds. Determining discharge-coefficient ratings for coastal structures in Dade County, Florida. Tallahassee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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8

D, Swain Eric, South Florida Water Management District (Fla.), South Florida Ecosystem Program (Geological Survey), and Geological Survey (U.S.), eds. Determining discharge-coefficient ratings for coastal structures in Dade County, Florida. Tallahassee, Fla: U.S. Geological Survey, 1997.

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9

D, Swain Eric, South Florida Water Management District (Fla.), and Geological Survey (U.S.), eds. Determining discharge-coefficient ratings for coastal structures in Dade County, Florida. Tallahassee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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10

Tillis, Gina M. Determining discharge-coefficient ratings for selected coastal structures in Broward and Palm Beach Counties, Florida. Tallahassee, Fla. (227 N. Bronough St., Tallahassee 32301-1372): U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Частини книг з теми "COEFFICIENTS FOR DISCHARGE"

1

Rahimbakhsh, M., P. Werle, E. Gockenbach, T. Hinrichs, J. de Boer, and M. Mostoofi. "Partial Discharge Monitoring via a Novel Curve Fitting Coefficients Method in Power Transformers." In Lecture Notes in Electrical Engineering, 1323–33. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31680-8_127.

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2

Bremer, F., and M. Oertel. "Numerical investigation of wall thickness influence on Piano Key Weir discharge coefficients: A preliminary study." In Labyrinth and Piano Key Weirs III – PKW 2017, 101–8. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315169064-14.

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3

Reader-Harris, Michael. "Orifice Discharge Coefficient." In Experimental Fluid Mechanics, 127–86. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16880-7_5.

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4

Reader-Harris, Michael. "Nozzle Discharge Coefficient." In Experimental Fluid Mechanics, 281–304. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16880-7_9.

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5

Mustafa, Mohammad Danish, Talib Mansoor, and Mohammad Muzzammil. "Prediction of Discharge Coefficients for Trapezoidal Labyrinth Weir with Half-Round (HR) and Quarter-Round (QR) Crest." In Lecture Notes in Civil Engineering, 427–35. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1890-4_33.

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6

Reader-Harris, Michael. "Venturi Tube Discharge Coefficient in High-Pressure Gas." In Experimental Fluid Mechanics, 203–43. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16880-7_7.

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7

Azizi, K., J. Attari, and A. Moridi. "Estimation of discharge coefficient and optimization of Piano Key Weirs." In Labyrinth and Piano Key Weirs III – PKW 2017, 213–20. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315169064-30.

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8

Yadav, Omprakash, Abhay Dahiya, Vinod Kumar Yadav, and Rahul Sharma. "Experimental and Computational Investigation of Coefficient of Discharge of Venturimeter." In Lecture Notes in Mechanical Engineering, 57–72. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3428-4_6.

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9

Kim, Jisung, Won Kim, Chanjoo Lee, and Yong Jeon Kim. "Characteristic of Roughness Coefficient Associated with Discharge in Gravel-Bed River." In Advances in Water Resources and Hydraulic Engineering, 963–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_169.

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10

Karimi, M., J. Attari, M. Saneie, and M. Jalili. "Experimental study of discharge coefficient of a Piano Key Side Weir." In Labyrinth and Piano Key Weirs III – PKW 2017, 109–16. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315169064-15.

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Тези доповідей конференцій з теми "COEFFICIENTS FOR DISCHARGE"

1

Teich, T. H. "Measurement of fundamental discharge coefficients." In IEE Colloquium on Advances in HV Technology. IEE, 1996. http://dx.doi.org/10.1049/ic:19960996.

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2

Ahmad, Rashid. "Discharge coefficients for axisymmetric supersonic nozzles." In 37th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-673.

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3

"Discharge Coefficients of Flat Fan Nozzles." In 2016 ASABE International Meeting. American Society of Agricultural and Biological Engineers, 2016. http://dx.doi.org/10.13031/aim.20162460834.

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4

Chu, Tay, A. Brown, and S. Garrett. "Discharge Coefficients of Impingement and Film Cooling Holes." In ASME 1985 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1985. http://dx.doi.org/10.1115/85-gt-81.

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Анотація:
In this article measurements of fluid flow through impingement and film cooling holes for typical turbine blade cooling systems are presented. The purpose of the measurements was to determine hole discharge coefficients over a range of Reynolds numbers from 5,000 to 30,000 and to observe in this range the dependence of discharge coefficient on Reynolds number. The effect of hole geometry, that is, sharp edged inlet or corner radius inlet, on discharge coefficients is also measured. Correlations relating discharge coefficients to Reynolds number, corner radius to hole diameter ratio, and blowing parameter are suggested.
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5

Furuichi, Noriyuki, Yoshiya Terao, Shinichi Nakao, Keiji Fujita, and Kazuo Shibuya. "Further Investigation of Discharge Coefficient for PTC 6 Flow Nozzle in High Reynolds Number." In ASME 2015 Power Conference collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/power2015-49174.

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Анотація:
The discharge coefficients of the throat tap flow nozzle based on ASME PTC 6 are measured in wide Reynolds number range from Red=5.8×104 to Red=1.4×107. The nominal discharge coefficient (the discharge coefficient without tap) is determined from the discharge coefficients measured for different tap diameters. The tap effects are correctly obtained by subtracting the nominal discharge coefficient from the discharge coefficient measured. Finally, by combing the nominal discharge coefficient and the tap effect determined in three flow regions, that is, laminar, transitional and turbulent flow region, the new equations of the discharge coefficient are proposed in three flow regions.
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6

Gregg, Walter Boyd, David E. Werth, and Carl Frizzell. "Determination of Discharge Coefficients for Hydraulic Sparger Design." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-2183.

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This paper provides design examples and summarizes a study on the determination of multiple free discharge orifice coefficients in a circular walled manifold for a variety of shapes and area projections. A simplified design procedure is presented which allows engineers to accurately maintain a given pressure and flow at the entrance to the sparger. The design provides for uniform flow across the cooling tower basin, and prevents an increase in back pressure or open channel flow within the sparger, minimizing the effect on upstream performance.
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7

Winter, J., and A. J. Stevens. "The Coefficients of Discharge of Angled Chuted Holes." In ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/89-gt-248.

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Анотація:
The coefficients of discharge of a number of angled chuted holes, typical of those currently used in the primary and dilution zones of some small reverse flow combustors, have been determined on a two dimensional rig. Also evaluated were two types of “low cost” angled chuted holes. The paper describes the test rig, the geometry of the holes, the coefficient of discharge data, the sensitivity of the data to certain features and makes comparisons of the data with those for plain and plunged holes.
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8

Blair, G. P., H. B. Lau, A. Cartwright, B. D. Raghunathan, and D. O. Mackey. "Coefficients of Discharge at the Aperatures of Engines." In International Off-Highway & Powerplant Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/952138.

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9

Nielsen, Kevin D., and Larry J. Weber. "Submergence Effects on Discharge Coefficients for Rectangular Orifices." In Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40517(2000)85.

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10

Ganippa, Lionel Christopher, Sven Andersson, and Jerzy Chomiak. "Transient Measurements of Discharge Coefficients of Diesel Nozzles." In International Fuels & Lubricants Meeting & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-2788.

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Звіти організацій з теми "COEFFICIENTS FOR DISCHARGE"

1

Over, Thomas, Riki Saito, Andrea Veilleux, Padraic O’Shea, Jennifer Sharpe, David Soong, and Audrey Ishii. Estimation of Peak Discharge Quantiles for Selected Annual Exceedance Probabilities in Northeastern Illinois. Illinois Center for Transportation, June 2016. http://dx.doi.org/10.36501/0197-9191/16-014.

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Анотація:
This report provides two sets of equations for estimating peak discharge quantiles at annual exceedance probabilities (AEPs) of 0.50, 0.20, 0.10, 0.04, 0.02, 0.01, 0.005, and 0.002 (recurrence intervals of 2, 5, 10, 25, 50, 100, 200, and 500 years, respectively) for watersheds in Illinois based on annual maximum peak discharge data from 117 watersheds in and near northeastern Illinois. One set of equations was developed through a temporal analysis with a two-step least squares-quantile regression technique that measures the average effect of changes in the urbanization of the watersheds used in the study. The resulting equations can be used to adjust rural peak discharge quantiles for the effect of urbanization, and in this study the equations also were used to adjust the annual maximum peak discharges from the study watersheds to 2010 urbanization conditions. The other set of equations was developed by a spatial analysis. This analysis used generalized least-squares regression to fit the peak discharge quantiles computed from the urbanization-adjusted annual maximum peak discharges from the study watersheds to drainage-basin characteristics. The peak discharge quantiles were computed by using the Expected Moments Algorithm following the removal of potentially influential low floods defined by a multiple Grubbs-Beck test. To improve the quantile estimates, regional skew coefficients were obtained from a newly developed regional skew model in which the skew increases with the urbanized land use fraction. The skew coefficient values for each streamgage were then computed as the variance-weighted average of at-site and regional skew coefficients. The drainage-basin characteristics used as explanatory variables in the spatial analysis include drainage area, the fraction of developed land, the fraction of land with poorly drained soils or likely water, and the basin slope estimated as the ratio of the basin relief to basin perimeter. This report also provides: (1) examples to illustrate the use of the spatial and urbanization-adjustment equations for estimating peak discharge quantiles at ungaged sites and to improve flood-quantile estimates at and near a gaged site; (2) the urbanization-adjusted annual maximum peak discharges and peak discharge quantile estimates at streamgages from 181 watersheds including the 117 study watersheds and 64 additional watersheds in the study region that were originally considered for use in the study but later deemed to be redundant. The urbanization-adjustment equations, spatial regression equations, and peak discharge quantile estimates developed in this study will be made available in the web-based application StreamStats, which provides automated regression-equation solutions for user-selected stream locations. Figures and tables comparing the observed and urbanization-adjusted peak discharge records by streamgage are provided at http://dx.doi.org/10.3133/sir20165050 for download.
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2

Nored and James. PR-015-07603-R01 Effect of Orifice Plate Manufacturing Variations on Orifice Meter Performance - Blinded. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), October 2013. http://dx.doi.org/10.55274/r0010636.

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Анотація:
An investigation to flow test and measure a large set of orifice plates to determine the proportion of existing orifice plates have measured discharge coefficients outside of the Reader-Harris/Gallagher equation 95% confidence limits. The research determined if the existing tolerance specifications adequately describe the dimensions of an orifice plate required to conform to the Reader-Harris/Gallagher equation calculated discharge coefficient. The testing also underscored the influence of manufacturing variations on orifice plate performance.
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3

Nored and James. PR-015-07603-R02 Effect of Orifice Plate Manufacturing Variations on Orifice Meter Performance - Unblinded. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), October 2013. http://dx.doi.org/10.55274/r0010829.

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Анотація:
An investigation to flow test and measure a large set of orifice plates to determine the proportion of existing orifice plates have measured discharge coefficients outside of the Reader-Harris/Gallagher equation 95% confidence limits. The research determined if the existing tolerance specifications adequately describe the dimensions of an orifice plate required to conform to the Reader-Harris/Gallagher equation calculated discharge coefficient. The testing also underscored the influence of manufacturing variations on orifice plate performance.
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4

Cao, H., D. DiCicco, and S. Suckewer. Quenching A-coefficients by photons in a short discharge tube. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/6970857.

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5

Cao, H., D. DiCicco, and S. Suckewer. Quenching A-coefficients by photons in a short discharge tube. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/10184533.

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6

Whetstone, James R. Measurements of coefficients of discharge for concentric flange-tapped square-edged orifice meters in water over the Reynolds number range 600 to 2,700,000. Gaithersburg, MD: National Bureau of Standards, 1989. http://dx.doi.org/10.6028/nist.tn.1264.

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7

Whetstone, James R. Measurements of coefficients of discharge for concentric flange-tapped square-edged orifice meters in natural gas over the Reynolds number range 25,000 to 16,000,000. Gaithersburg, MD: National Bureau of Standards, 1989. http://dx.doi.org/10.6028/nist.tn.1270.

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8

Strakey, P. A., and D. G. Talley. The Effect of Manifold Cross-Flow on the Discharge Coefficient Sharp-Edged Orifices. Fort Belvoir, VA: Defense Technical Information Center, March 1998. http://dx.doi.org/10.21236/ada409685.

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9

Langley, R. A., W. L. Rowan, R. V. Bravenec, and K. Nelin. Measurement of the hydrogen recombination coefficient in the TEXT tokamak as a function of outgassing and power radiated during tokamak discharges. Office of Scientific and Technical Information (OSTI), October 1986. http://dx.doi.org/10.2172/7056126.

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10

Cao Romero, Julio A., Jorge Reyes-Avendaño, Julio Soriano, Leonardo Farfan-Cabrera, and Ali Erdemir. A Pin-on-Disc Study on the Electrified Sliding Wear of EVs Powertrain Gears. SAE International, March 2022. http://dx.doi.org/10.4271/2022-01-0320.

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Анотація:
In contrast to conventional powertrains from internal combustion engine vehicles (ICEV), the tribological performance of powertrains of electric vehicles (EVs) must be further evaluated by considering new critical operating conditions such as electrical environments. The operation of any type of electric motor produces shaft voltages and currents due to various hardware configurations and factors. Furthermore, the common application of inverters intensifies this problem. It has been reported that the induced shaft voltages and currents can cause premature failure problems in tribological components such as bearings and gears due to accelerated wear and/or fatigue. It is ascribed to effects of electric discharge machining (EDM), also named, sparking wear caused by shaft currents and poor or increasingly diminishing dielectric strength of lubricants. A great effort has been done to study this problem in bearings, but it has not yet been the case for gears. Considering that EVs powertrains can be configurated with an electric motor coupled to a single-speed or multi-speed transmission, it is expected that shaft currents can also affect gears to some extent. The pin-on-disc test has been widely used to study sliding wear of gear materials under comparable or realistic operating conditions. This accelerated test is effective for screening materials, lubricants and operating conditions allowing evaluations of their friction and wear properties. However, it has not been implemented for studying gear materials under electrified environments. Thus, this paper aims to explore the friction coefficient and wear of gear materials under non-electrified and electrified sliding in a pin-on-disc tester applying typical of EVs powertrain shaft currents during sliding. The tests were carried out at two different DC currents under comparable gear dry and lubricated sliding contact conditions. Friction coefficient, wear volumes and morphologies were evaluated and reported in this work.
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