ANALYTICAL EVALUATION OF EFFECT OF EQUIVALENCE RATIO INLET-AIR TEMPERATURE, AND COMBUSTION PRESSURE ON PERFORMANCE OF SEVERAL POSSIBLE RAM-JET FUELS

摘要

The benefit to air specific impulse of an increase in inlet-air temperature at the higher equivalence ratios was reduced by such high temperature effects as dissociation and increased specific heats of the combustion products. An increase in combustion pressure from 0.2 to 2 atmospheres raised the air specific impulse level as much as 5 seconds at higher equivalence ratios. The fuel consumption of pentaborane and diborane remained below that of octene-1 despite the adverse effect of boron oxide vaporization on the performance of fuels containing boron at combustion temperatures exceeding 3000° R; the fuel consumption of boron became higher than that of octene-1 above this temperature. Boron, as well as diborane and pentaborane, provided higher air specific impulse than octene-1 at an equivalence ratio of 1.0.