Scramjet Operability Range Studies of a Multifuel Integrated Aeroramp Injector/Plasma Igniter

Computational Simulation of Scramjet Combustors - A Comparison between Quasi-One Dimensional and 2-D Numerical Simulations

“…The engines have traversed through the evolutionary path from propellers to turbo-jets, turbo-fans, ramjets and finally scramjets. The common attribute shared amongst all of the above mentioned propulsive devices is that they rely on the atmospheric air to achieve thrust, and are hence called airbreathing engines [4].…”

“…The strong driving force in the hypersonic industry is in finding a cheaper access to space with the ultimate goal of designing a launch vehicle for achieving single-stage to orbit or SSTO [4]. However, a vehicle must fly at hypersonic velocities, if it intends to reach orbit.…”

“…However, a vehicle must fly at hypersonic velocities, if it intends to reach orbit. Hence, from a cycle efficiency point of view, the air-breathing engines prove much superior to other chemical propulsive devices as they use oxygen from the atmospheric air [4]. This is significant from the systems perspective as it allows for a larger payload since the vehicle is not carrying an onboard fuel oxidizer [4].…”

“…The combustion products are further accelerated through a converging-diverging nozzle having a narrow throat or a mechanical choke to supersonic speeds. This provides the necessary exhaust moment to accelerate the vehicle [4,14]. A schematic of ramjet is shown in Figure 6.…”

“…These elevated temperatures are sufficient enough to melt down most of the known materials [16]. Also the increased temperatures can cause the dissociation of the combustion products, thus in-turn limiting the temperature rise and thereby reducing thermal efficiency [4]. The near-stagnation pressure resulting from slowing down high speed supersonic flow to subsonic conditions can elevate the burner entry pressure [4].…”