Thrust Losses in Hypersonic Engines Part 1: Methodology

Expressions for the thrust losses of a scramjet engine are developed in terms of irreversible entropy increases and the degree of incomplete combustion. A method is developed that allows the calculation of the lost engine thrust or thrust potential caused by different loss mechanisms within a given e owe eld. This method allows the performance-based assessment of the trade between mixing enhancement and resultant increased e ow losses in scramjet combustors. An engine effectiveness parameter for use in optimization of engine components is dee ned in terms of thrust losses.