In scramjet engines, ignition must take place within a residence time on the order of milliseconds. this study, secure conditions for specified n-octane pyrolysis fuel components used in autoignition or forced-ignition by plasma jet torch high-speed flow were numerically investigated. First, delay combustor and cavity flame-holder was estimated using chemical reaction analysis. Three (n-C8H18, ...

Flow inside the isolator of a scramjet engine is likely to be in thermal non-equilibrium due to successive shock-based compressions and expansions. Given the short flow-through timescales in such engines, the flow might not reach equilibrium even in the fuel injection region. Since the distribution of energy in the internal modes affects chemical reactions, non-equilibrium has been shown to hav...

This paper presents a set of parallel procedures for anisotropic mesh adaptation accounting for mixed element types used in boundary layer meshes, i.e., the presented procedures operate in parallel on distributed boundary layer meshes. The procedures accept anisotropic mesh metric field as an input for the desired mesh size field and apply local mesh modifications to adapt the mesh in order to ...

The coherent anti-Stokes Raman spectroscopy (CARS) method has recently been used in the United States and Europe to probe several different types of propulsion systems for air vehicles. At NASA Langley Research Center in the United States, CARS has been used to simultaneously measure temperature and the mole fractions of N2, O2 and H2 in a supersonic combustor, representative of a scramjet engi...