Vibrational and chemical nonequilibrium in a stoichiometric turbojet engine using kerosine-type fuel

Abstract

The effects of vibrational and chemical nonequilibrium on turbine performance were investigated separately. The vibrational model was taken as a pure nitrogen expansion, and the chemical model was taken as the combustion products of a stoichiometric mixture of kerosene and air. The loss of performance of fully frozen flow with respect to the equilibrium flow for each model was determined. The extent to which nonequilibrium will occur was investigated within limited ranges of pressure and temperature. Vibrational nonequilibrium can result in losses up to seven percent with respect to equilibrium flow. Vibrational freezing will be virtually complete a short distance after the throat of the first stator assembly. the losses due to chemical nonequilibrium are insignificant compared to the vibrational nonequilibium losses.