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Solid Fuel Ramjet Regulation by Means of an Air Division Valve

机译：通过空气分配阀调节固体燃料冲压发动机

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An analytical study was conducted, developing a theoretical model for the regulation of solid fuel ramjets by means of an air division valve. The solid fuel ramjet motor is the simplest air-breathing propulsion means for supersonic flights. However, the variable flight conditions over the operating envelope of altitudes and velocities significantly affect the motor performance. Regulation requirement was defined in this study as the motor capability of operating at a constant, desirable fuel to air ratio over a wide range of flight conditions. The adopted method is based on an air division valve, which drives a part of the incoming air from the diffuser through a bypass to the aft-mixing end of the combustion chamber. The model takes into account the parameters that influence the burning rate of the solid fuel (air mass flow, port diameter) and formulates a general regulation law for the division valve. The method was checked for specific cases, considering different trajectories. The control law provided a good regulation by means of the division valve, determining the instantaneous opening state of the valve that assures a constant optimal fuel to air ratio over the operating envelope.

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