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NACA-TN-1947
Investigation of flow coefficient of circular, square, and elliptical orifices at high pressure ratios
Year: 1949
Abstract: INTRODUCTION
The introduction of a gas or a vapor into an air stream for Purposes of heating or cooling the air stream may be easily accomplished by the use of a high-velocity jet directed perpendicularly to the air stream, as reported in reference 1. In order to evaluate the heating or cooling effect of such a Jet, knowledge of the mass air flow of the Jet or, more fundamentally, the discharge coefficient of the orifice from which the Jet is issuing is essential. In addition to the effects of Jet Reynolds number and orifice shape on the discharge coefficient, the Jet pressure ratio and the interaction of the air stream and the Jet must be considered.
An investigation to determine the orifice-discharge coefficient of a high-velocity air Jet directed perpendicularly to an air stream was undertaken in a 2- by 20-1nch duct tunnel at the NACA Lewis laboratory. The discharge coefficients of circular, square, and elliptical orifices were determined at tunnel-air velocities of 160, 2275, and 380 feet per second for several Jet (orifice) areas, A range of pressure ratios from 1.15 to 3.2, and a Jet total temperature of approximately 400° F.
The introduction of a gas or a vapor into an air stream for Purposes of heating or cooling the air stream may be easily accomplished by the use of a high-velocity jet directed perpendicularly to the air stream, as reported in reference 1. In order to evaluate the heating or cooling effect of such a Jet, knowledge of the mass air flow of the Jet or, more fundamentally, the discharge coefficient of the orifice from which the Jet is issuing is essential. In addition to the effects of Jet Reynolds number and orifice shape on the discharge coefficient, the Jet pressure ratio and the interaction of the air stream and the Jet must be considered.
An investigation to determine the orifice-discharge coefficient of a high-velocity air Jet directed perpendicularly to an air stream was undertaken in a 2- by 20-1nch duct tunnel at the NACA Lewis laboratory. The discharge coefficients of circular, square, and elliptical orifices were determined at tunnel-air velocities of 160, 2275, and 380 feet per second for several Jet (orifice) areas, A range of pressure ratios from 1.15 to 3.2, and a Jet total temperature of approximately 400° F.
Subject: AIR
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:25:56Z | |
| date available | 2017-09-04T16:25:56Z | |
| date copyright | 01/01/1949 | |
| date issued | 1949 | |
| identifier other | TYZTYDAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/89197 | |
| description abstract | INTRODUCTION The introduction of a gas or a vapor into an air stream for Purposes of heating or cooling the air stream may be easily accomplished by the use of a high-velocity jet directed perpendicularly to the air stream, as reported in reference 1. In order to evaluate the heating or cooling effect of such a Jet, knowledge of the mass air flow of the Jet or, more fundamentally, the discharge coefficient of the orifice from which the Jet is issuing is essential. In addition to the effects of Jet Reynolds number and orifice shape on the discharge coefficient, the Jet pressure ratio and the interaction of the air stream and the Jet must be considered. An investigation to determine the orifice-discharge coefficient of a high-velocity air Jet directed perpendicularly to an air stream was undertaken in a 2- by 20-1nch duct tunnel at the NACA Lewis laboratory. The discharge coefficients of circular, square, and elliptical orifices were determined at tunnel-air velocities of 160, 2275, and 380 feet per second for several Jet (orifice) areas, A range of pressure ratios from 1.15 to 3.2, and a Jet total temperature of approximately 400° F. | |
| language | English | |
| title | NACA-TN-1947 | num |
| title | Investigation of flow coefficient of circular, square, and elliptical orifices at high pressure ratios | en |
| type | standard | |
| page | 28 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1949 | |
| contenttype | fulltext | |
| subject keywords | AIR | |
| subject keywords | FLOW | |
| subject keywords | JETS | |
| subject keywords | NUMBER | |
| subject keywords | ORIFICES | |
| subject keywords | REYNOLDS |