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Published February 1968 | public
Journal Article

A Study of the Interaction of Gaseous Jets from Transverse Slots with Supersonic External Flows


The paper describes a study concerning the sonic injection of a gaseous jet through a transverse slot nozzle in a wall into an external flow which is uniform outside of a turbulent boundary layer. An analytic model of the flowfield has been constructed in which conservation of momentum is applied to a control volume at the jet nozzle exit. A series of flat-plate experiments was conducted with normal, sonic jets at external flow Mach numbers of 2.61, 3.50, and 4.54. Pressure data near separation and the plateau were in agreement with existing correlations. Comparisons of the trends predicted by the analysis with two-dimensional force data from these experiments and from other sources showed good agreement. Values of amplification factor, the upstream interaction force plus the jet thrust divided by the vacuum thrust of a sonic jet, of 2.9 to 3.2 were measured. The amplification factor is relatively insensitive to variations in external flow Mach number and variations in injectant gas properties. A correlation of data obtained from experiments with finite-span slots demonstrates that the effective jet penetration height and the slot span are the important characteristic dimensions of such flowfields.

Additional Information

© 1968 American Institute of Aeronautics and Astronautics. Received May 9, 1967; revision received October 2, 1967. This work was supported by the Missile and Space Systems Division of the Douglas Aircraft Company under the sponsorship of the Douglas Independent Research and Development Program, by the Daniel and Florence Guggenheim Jet Propulsion Center of the California Institute of Technology, and by NASA, through the Solid Propellant Engineering Section of the Jet Propulsion Laboratory, California Institute of Technology.

Additional details

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