ABSTRACT
The main function of an injection system is to supply the requisite quantity of liquid propellant that ensures proper mixing of fuel and oxidizer in the combustion chamber such that smooth and stable combustion can be ensured during its entire operating range. The injector element is the most delicate and important part of the liquid-propellant rocket engine as it dictates the atomization, distribution, and mixing of the propellant in the combustion chamber. The extent of liquid jet disintegration is dependent on jet diameter, momentum, injection pressure drop, chamber pressure, and angle of impingement. Several types of injectors have been devised for rocket engines, namely nonimpinging and impinging. The gas pressure feed system is one of the simplest methods of pressurizing the propellant in rocket engine in which high-pressure gas is being used to force the liquid propellants in a very controlled manner from their respective tanks. Radial pumps are preferred for almost all operational liquid-propellant rocket engines.
