Despite the widespread use of convergent-conical nozzles as propulsion nozzles in turbojet aircraft, little attention has been given to the effect of nozzle shape on their propulsive performance. This paper presents the results of an experimental investigation in which the effect of nozzle angle on the internal characteristics of the flow field and on the propulsive performance of convergent conical nozzles was investigated. In addition, a theoretical solution is described which was developed as a part of this investigation. Fifteen, twenty-five, and forty-degree nozzles were tested at pressure ratios from 1.4 to 7.0. Measurements were made of the nozzle discharge coefficient, thrust coefficient, local flow angle, and wall static pressure. The properties of the internal flow field were seen to be affected by the nozzle angle and at pressure ratios less than the choked pressure ratio by the pressure ratio as well. The results of the theoretical analysis substantiate this behavior and are in reasonable agreement with the experimental data.
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December 1972
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Journal of Basic Engineering
Research Papers
An Experimental Study of Compressible Flow Through Convergent-Conical Nozzles, Including a Comparison With Theoretical Results
R. L. Thornock,
R. L. Thornock
Propulsion Research Unit, The Boeing Co., Seattle, Wash.
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E. F. Brown
E. F. Brown
Virginia Polytechnic Institute and State University, Blacksburg, Va.
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R. L. Thornock
Propulsion Research Unit, The Boeing Co., Seattle, Wash.
E. F. Brown
Virginia Polytechnic Institute and State University, Blacksburg, Va.
J. Basic Eng. Dec 1972, 94(4): 926-930 (5 pages)
Published Online: December 1, 1972
Article history
Received:
June 23, 1971
Online:
October 27, 2010
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Discussion: “An Experimental Study of Compressible Flow Through Convergent-Conical Nozzles, Including a Comparison With Theoretical Results” (Thornock, R. L., and Brown, E. F., 1972, ASME J. Basic Eng., 94, pp. 926–930)
Citation
Thornock, R. L., and Brown, E. F. (December 1, 1972). "An Experimental Study of Compressible Flow Through Convergent-Conical Nozzles, Including a Comparison With Theoretical Results." ASME. J. Basic Eng. December 1972; 94(4): 926–930. https://doi.org/10.1115/1.3425591
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