Abstract
This chapter examines the meaning and properties of rocket propulsive efficiency, for both constant and variable exhaust speed. Propulsive efficiency can be defined as a point function, that is, it depends on the instantaneous operating conditions. Another way of defining propulsive efficiency is to say that a propulsion system operates in the most efficient manner when the least amount of energy need to be converted to increase the speed of the burnout mass by a specified amount. The rate of converting energy into kinetic energy of rocket and jet, that is, the propulsive power, is invariant. In case of interval function, the propulsive efficiency possesses a maximum (less than unity) with respect to mass ratio for constant exhaust speed, whereas, for variable exhaust speed, the propulsive efficiency increases monotonically (to unity) with increasing mass ratio mo/ml. Thus, the advantage of using optimum variable exhaust speed as opposed to constant exhaust speed becomes more pronounced with higher mass ratio.
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