Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
COMPARATIVE ANALYSIS OF THE FLOW INSIDE A SUPERSONIC COMBUSTION TEST BENCH USING TWO DIFFERENT LENGTHS FOR THEIR VICIATED AIR GENERATOR
Submission Author:
Taiana Cortes , SP , Brazil
Co-Authors:
Taiana Cortes, Valéria Leite, Guilherme Borges Ribeiro, Débora Cristina Menezes Silva
Presenter: Taiana Cortes
doi://10.26678/ABCM.COBEM2021.COB2021-1020
Abstract
The supersonic combustion test bench (SCTB) is a ground test facility for the study of supersonic combustion. The SCTB simulates the flow conditions in actual flight at the entrance of the combustor of a scramjet (supersonic combustion ramjet), which is an aspirated engine with supersonic combustion reactor. For the supersonic combustion experimental researches, the Institute for Advanced Studies (IEAv) has a pilot SCTB. The 480 mm long pilot SCTB used in this study consists of a combustion chamber, or vitiated air generator (VAG), to heat the air, coupled with a supersonic nozzle that accelerates this heated air to the desired test speed. For the studies of supersonic combustion, the combustor, to be tested, is coupled immediately after the nozzle exit, for this reason this test bench is called directly connected. For a better flame stability inside the VAG, a 1000 mm long SCTB is being designed and, for that, it was necessary to study it considering the same conditions at the entrance of the 480 mm long BTCS. This study seeks a relationship between the desired conditions of temperature, Mach number and oxygen content, equal to 21%, at the exit of the SCTB, with both lengths, and the mass flow of the reagents (hydrogen, air and oxygen) at their entrance, with the intention of making a comparative analysis between the two lengths of SCTB in order to better understand how to reach the desired flow conditions at their exit. For this purpose, the behavior of the hot flow along the test bench is numerically evaluated to compare the results obtained for the two different lengths of the SCTB. With the results it is possible to analyze what is the best relationship between the inlet and outlet flow conditions of the bench to, in the future create a methodology to manipulate the mass flow rate of the three reagents (O2, air, Hydrogen), at the entrance of the SCTB, in order to control the test flow at its exit, with the desired temperature and Mach number and also with O2 to maintain a 21% concentration at the outlet. The results can also provide data for future analysis of the effectiveness of the nozzle geometry in generating the desired test conditions.
Keywords
Scramjet, Computational simulation, ground test facility, vitiated air generator
