Transient Performance Simulation of Ramjets Considering Volume Effect

Ramjets can provide higher specific impulse comparing to turbojet or turbofan engines. The influence of the volume effect when ramjets are accelerating or decelerating are studied by getting thrusts’ and fuel consumptions’ data. To that end, in-house models for ramjets’ transient performance and volume effects are built and used for simulation. During both accelerating and decelerating processes, the volume effect will cost extra time and cause thrust loss or gain for the ramjet to balance its performance. In a decelerating then accelerating process, the minimum thrust can be larger. The volume effect will be more noticeable when the ramjet’s thrust is comparatively low.