Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Numerical Characterization and Analysis of the Chemical Kinetics of the Mixture of Silane, Hydrogen and Air for Supersonic Combustion Applications
Submission Author:
Rafael Maia Altafim , SP
Co-Authors:
Rafael Maia Altafim, Loreto Pizzuti, Alexandre Costa Goulart
Presenter: Loreto Pizzuti
doi://10.26678/ABCM.COBEM2023.COB2023-1025
Abstract
Supersonic combustion engines, known as scramjets, are used in hypersonic vehicles, which fly at speeds above Mach 5.0. The study of hypersonic technology has been carried out by the main militarily developed nations in the world due to the inability of the defense systems currently in operation to protect their territory from vehicles flying at this speed. Among other countries, the Brazilian Air Force are currently working on the development of the project for the Brazilian Hypersonic Vehicle 14-X. In this context, the purpose of this article is to develop a theoretical characterization of the mixture of silane (SiH4), hydrogen (H2) and air (O2 ,N2) performing a chemical kinetics analysis for supersonic combustion application. Therefore, this analysis will consider the altitude of 30 km to gather the concentration of oxygen and nitrogen gases in atmospheric air, considering that this is a cruise altitude of supersonic combustion engines. The analysis utilizes the silane_v2 mechanism, developed by Miller in 2004, for the silane-hydrogen-air mixture. A reduced mechanism with enhanced computational efficiency was developed, called silane_v3. This new mechanism also adds the chemical transport elements properties which were estimated for accurate modeling, and equations from the GRI Mech 3.0 mechanism were incorporated for NOx pollutant emission analysis. Therefore, the characterization should determine the ignition delay time of the combustion, the laminar flame speed and the concentration of the combustion products, including pollutants species, for different mixture compositions of silane, hydrogen and air.
Keywords
silane, Hydrogen, supersonic combustion, laminar flame speed, Ignition delay time
