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  • 1
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    AGARD WG13 aerodynamics of high speed air intakes: Assessment of CFD results (1992)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: A brief review of the work accomplished by the numerical subgroup of AGARD Working Group 13 on the aerodynamics of high speed air intakes is presented. This work comprised the selection of test cases for which experimental data were available. The test cases were chosen to range in complexity from normal-shock/boundary-layer interaction to full forebody-inlet combinations. Computations for these test cases were solicited from a large number of organizations and individual researchers within the NATO countries. The computation methods reached from Euler solvers (with and without boundary layer corrections) to full Reynolds averaged Navier-Stokes codes. The group compared these results with the test data available for each test case. A short overview of the CFD methods employed, a description of the test cases selected, and some of the comparisons between CFD solutions and test data are presented. The conclusions and recommendations drawn from this assessment are given.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AGARD, Aerodynamic Engine(Airframe Integration for High Performance Aircraft and Missiles; 24 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Results of AGARD assessment of prediction capabilities for nozzle afterbody flows (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents a brief review of an assessment conducted by AGARD Working Group 08 to determine the capabilities of theoretical methods for predicting the flow over nozzle afterbody configurations. A series of test cases were selected for which extensive experimental data were available. The assessment was limited to axisymmetric nozzle configurations with a jet simulated with high-pressure air. Contributions were solicited from researchers, identified by a literature search, who had developed methods for predicting such flows. Predictions made with methods that varied in complexity from multicomponent techniques to solutions of the Navier Stokes equations were received. The status of the theoretical methods for predicting nozzle afterbody flows is illustrated by comparison with the experimental measurements.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 85-1464
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    On the inlet vortex system (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The flow field of a jet engine with an inlet vortex, which can pick up heavy debris from the ground and damage the engine, was simulated in a small water tunnel by means of the hydrogen bubble technique. It was found that the known engine inlet vortex is accompained by a vortex system, consisting of two inlet vortices (the ground based and the trailing one), secondary vortices, and ground vortices. Simulation of the ground effect by an inlet image proved that the inlet vortex feeds on free stream vorticity and can exist without the presence of a ground boundary layer. The structural form of the inlet vortex system was explained by a simple potential flow model, which showed the number, location, and the importance of the stagnation points. A retractable horizontal screen or an up-tilt of the engine is suggested as countermeasure against debris ingestion.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-140182
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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