A theoretical analysis of jet deflection from plane and axisymmetric curved obstacles.
Hiriart Le-Bert, Gerardo
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A class of analytical and numerical solutions to the problem of inviscid-jet deflection from plane and axisymmetric concave surfaces are presented. The methods of solution for the two-dimensional cases included a novel method developed in the present investigation, as well as those due to Levi-Civita and Riemann and Hilbert. These methods have provided indirect solutions for the shape of the curved solid boundary in terms of a given jet-departure and jet-deflection angle. The axisymmetric cases, namely, the deflection of axisymmetric jets from hemispherical thrust reversers are solved directly through the use of the finite element method and a novel iteration scheme. The real-fluid effects on the jet deflection are estimated by comparing the results with those obtained experimentally. The analytical and numerical methods developed or used herein are sufficiently general to yield direct and indirect solutions for more general nozzle and curved-reverser combinations of special interest to thrust reversal on aircraft engines.
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