We demonstrate an adjoint based approach for accelerating Monte Carlo estimation of risk, and apply it to estimating the probability of unstart in a SCRamjet engine under uncertain conditions that are characterized by various Gaussian and non-Gaussian distributions. The adjoint equation is solved with respect to an objective function that is used to identify unstart and the adjoint solution is ...

In a scramjet, the fuel can be used to cool down the engine walls. The thermal decomposition of the jet fuel changes the reacting mixture before its combustion. A numerical study of the pyrolysis of norbornane, a jet fuel surrogate, has been performed. Rate constants of some sensitive reaction channels have been calculated by means of quantum chemical calculations at the CBS-QB3 level of theory...

Regenerative cooling is considered promising in the thermal protection of hypersonic propulsion devices such as SCRamjet. However, heat transfer deterioration (HTD) hydrocarbon fuel a severe threat to structure safety, especially under axially nonuniform flux caused by load difference different components. In this work, trans-critical n-decane mini-horizontal channel numerically investigated. T...

At an extremely high Mach number, the regenerative cooling of traditional kerosene cannot meet requirement heat sink caused by aerodynamic heating and internal combustion in a scramjet propulsion system. As supplement cooling, supercritical CO2 is regarded as effective coolant severe environments due to its excellent properties mass transportation. In this paper, transfer flow structure charact...

Plasmas have a broad field of applications, such as air-breathing hypersonic vehicles (plasma control for scramjet engine), spacecraft atmospheric entries (influence of precursor electrons and prediction of blackout phenomenon), high-enthalpy wind tunnels (plasmatron, arc-jet, and shock tube facilities), lightning phenomena, discharges at atmospheric pressure, laboratory nuclear fusion and astr...