An Analytical Study of the Scramjet Exhaust Expansion System. Part IV.
Final technical rept. 1 Sep 70-31 Aug 71,
PURDUE UNIV LAFAYETTE IND JET PROPULSION CENTER
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The research was designed to study the losses in a scramjet exhaust expansion nozzle and to develop methods of designing the exhaust expansion system to maximize the thrust or minimize the sum of the losses. The overall program includes a literature survey and the development of computer programs for the following purposes to design optimized axisymmetric and plug nozzles accounting for boundary layer effects, to design axisymmetric nozzles with nonequilibrium chemical reactions, to design axisymmetric nozzles for gas-particle flows, to analyze isentropic flow in a three-dimensional nozzle, to analyze nonequilibrium, chemically reacting flow in three-dimensional nozzles, and to design optimized three-dimensional nozzles. The design problems are formulated using variational calculus to obtain the maximum thrust the problem constraints are imposed by using Lagrange multipliers. The results of the fifth and final years effort are summarized. Author
- Fluid Mechanics
- Jet and Gas Turbine Engines