PRELIMINARY EVALUATION OF THE AIR AND FUEL SPECIFIC-IMPULSE CHARACTERISTICS OF SEVERAL POTENTIAL RAM-JET FUELS Ⅲ – DIBORANE, PENTABORANE,BORON,AND BORON-OCTENE-1 SLURRIES

摘要

An analytical evalution of the air and fuel specific-impulse characteristics of diborane, pentaborane, boron, and boron - octene-1 slurries has been made.nAdiabatic constant-pressure combustion temperature, air specific impulse, and fuel specific impulse are given for each fuel. The specific-impulse data for octene-1, taken as representative of aviation-gasoline performance, are presented for comparison.nAt an initial air temperature of 560° R and a pressure of 2 atmos¬pheres, the adiabatic constant-pressure combustion temperatures for diborane, pentaborane, and boron were 4840°, 4990°, and 5320° R, respectively, for a fuel equivalence ratio of 1.0.nDiborane, pentaborane, boron, and boron - octene-1 slurries permit the attainment of air specific-impulse values beyond the octene-1 limit. At a fixed air specific impulse, the fuel-weight specific impulse of diborane is better than that for pentaborane, and pentaborane is better than boron. Boron gives a greater fuel-weight specific impulse than octene-1 at all air specific-impulse values less than 141 ((lb) (sec)/lb air). For air specific-impulse values between 141 and 172.8 ((lb)(sec)/lb air), octene-1 gives greater fuel-weight spe¬cific impulse values than boron;for air specific-impulse values greater than the 172.8 octene-1 limit, boron gives a fuel-weight spe¬cific impulse superior to octene-1.