Experimental Investigation of the Brazilian 14-X B Hypersonic Scramjet Aerospace Vehicle

Martos, João Felipe de Araujo; Vilela, Renan G.; Lima, Bruno Coelho; Laiton, Sergio Nicholas Pachon; Marcos, Thiago Victor Cordeiro; Rêgo, Israel; Toro, Paulo

doi:10.20906/cps/con-2016-1150

Cited by 1 publication

(2 citation statements)

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“…The flow field, especially the cavity 15 International Journal of Aerospace Engineering shear layer, is changed hugely by combustion in the axisymmetric scramjet. The combustion in the reacting flow field also leads to the nonaxisymmetric fuel mass exchange near the cavity shear layer (2) In the nonreacting flow field, the thickness of the cavity shear layer decreases and the cavity shear layer becomes straight because of the reduced expansion of the main flow, when the aft wall angle increases. More fuel can be entrained and mix with the air of the supersonic inflow.…”

Section: Discussionmentioning

confidence: 99%

“…The air-breathing scramjet engine, which is the main part of the propulsion system of hypersonic vehicles, has drawn wide attention because of its excellent performance [1]. The researches on scramjet with rectangular crosssection have provided detailed and useful information for the development of hypersonic vehicles [2]. However, Bulman and Siebenhaar [3] emphasized the advantages of circular or axisymmetric cross-section scramjet (expressed as "axisymmetric scramjet" for simplicity in the rest of this article), such as good strength, light weight, small friction, and total pressure loss.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of an Axisymmetric Model Scramjet Assisted with Cavity of Different Aft Wall Angles

Sun

Zhao

et al. 2021

International Journal of Aerospace Engineering

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An axisymmetric model scramjet assisted with cavity flameholder is numerically investigated. Three-dimensional Reynolds-averaged Navier-Stokes simulation is carried out to reveal the fuel mixing and combustion characteristics. The simulation results show reasonable agreements with experimental data. The analysis indicates that the axisymmetric and rectangular scramjet has some similarities to the cavity shear layer in the nonreacting flow field. The configuration of the cavity shear layer changes hugely due to the significant chemical reaction and heat release in the reacting flow field. Typically, two more configurations with different cavity aft wall angles are compared with the experimental configuration to optimize the configuration of the cavity. When the cavity aft wall angle is small, the cavity shear layer bends to the cavity floor and more fuel enters into and stays in the cavity, which results in poor fuel mixing performance. With the increase of the aft wall angle, the fuel distributes more uniformly and the fuel mixing efficiency improves. In the reacting flow field, the volume of the cavity full of hot products and free radicals increases while the interaction between the cavity and main flow decreases with the increase of the aft wall angle. The improved combustion efficiency shows that larger cavity volume weighs more than reduced interaction between the cavity and main flow. The combustion is more violent in the case with a larger aft wall angle. Therefore, a proper increase of the aft wall angle is beneficial to the performance of cavity-assisted axisymmetric scramjet when designing the cavity flameholder.

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Section: Discussionmentioning

confidence: 99%