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An investigation of the ejector-powered jet-flap


Sidor, Laurent B. (1974) An investigation of the ejector-powered jet-flap. Engineer's thesis, California Institute of Technology. doi:10.7907/D5X4-X160.


The inviscid and incompressible potential flow aspects associated with a two-dimensional ejector-powered jet-flap configuration are investigated. The energy addition due to the mixing process in the ejector results in a non-homogeneous flow and is represented by an actuator disk located between the lifting surfaces and a powered wake. A set of singularities is developed to represent the lifting surfaces, to include camber and flap deflection, and the powered wake. A numerical procedure is used to compute the total system vorticity needed to satisfy exactly all the prescribed boundary conditions. The lift and moment coefficients are evaluated as a function of the head change prescribed across the actuator disk. A simple interpretation of the resulting lift curves is proposed in terms of analytical results obtained for single-airfoil configurations - a flat-plate airfoil and sink system, and a conventional single element jet flap. The sink effect of the actuator accounts for a finite lift at zero angle of attack, and the lift increment due to angle of attack only can be predicted by using Spence's theory of the jet flap.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:Aeronautics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Stewart, Homer Joseph
Thesis Committee:
  • Unknown, Unknown
Defense Date:10 September 1973
Record Number:CaltechTHESIS:09232010-143232435
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6044
Deposited On:23 Sep 2010 22:40
Last Modified:21 Dec 2019 02:55

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