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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
PRELIMINARY DESIGN AND ANALYSIS OF A GENERIC SCRAMJET AIR INLET FOR ATMOSPHERIC FLIGHT AT MACH NUMBER 5.8
Submission Author:
JOSÉ FERNANDES , RN
Co-Authors:
JOSÉ FERNANDES , Lucas Carvalho, Luísa Mirelle Santos, George Marinho, Paulo Toro, José de Medeiros
Presenter: JOSÉ FERNANDES
doi://10.26678/ABCM.ENCIT2020.CIT20-0649
Abstract
. A generic hypersonic airbreathing propulsion based on supersonic combustion ramjet (scramjet) technology has been designed, at the Universidade Federal do Rio Grande do Norte (UFRN), using analytical theoretical analysis (engineering approach). A two-dimensional hydrogen powered generic scramjet inlet has been designed to demonstrate, in atmospheric flight, a supersonic combustion, of atmospheric air (in supersonic speed) with hydrogen, on an acceleration mission to 1710 m/s (Mach number 5.8) at 20 km geometric altitude. In this preliminary design, one-dimensional compressible flow (shock wave) theory, which may readily describe many features of compression region of the airbreathing engine, is used to estimate the shock wave angles, thermodynamic properties and the velocities (Mach numbers) of the hypersonic atmospheric air flow, at the generic scramjet inlet. The scramjet engine is divided into several components based on key design parameters to assess the engine performance as a function of these parameters. One of the most important design aspects is the temperature at the entrance of the combustion chamber because the compression must provide enough high temperature, higher than ignition temperature of the hydrogen, for supersonic combustion with the supersonic atmospheric air, at the combustion chamber. The turning (deflection) angles of the compression section ramps are optimized by using the same total pressure (recovery) ratios across each incident oblique shockwave. Additionally, calculations are done in order to check if the momentum and the energy are conserved across each oblique shockwave.
Keywords
Scramjet, hypersonic airbreathing propulsion, supersonic combustion
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