COMBINED EFFECT OF CONTRACTION RATIO AND CHAMBER PRESSURE ON THE PERFORMANCE OF A GASEOUS HYDROGEN - LIQUID-OXYGEN COMBUSTOR FOR A GIVEN PROPELLANT WEIGHT FLOW ANDnOXIDANT-FUEL RATIO

摘要

The effect of contraction ratio and chamber pressure on the combustion performance of a gaseous-hydrogen - liquid-oxygen combustor was investigated analytically and experimentally.- The experiment was con¬ducted with a "two-dimensional" gaseous-hydrogen - liquid-oxygen engine of about 150-pound thrust* The contraction ratio was varied from 1.5 to 6 by changing the nozzle throat area. This variation resulted in a chamber pressure variation of about 25 to 120 pounds per square inch. The experimental results were corrected for heat transfer to the engine walls and momentum pressure losses.nThe experimental-performance, as evaluated in terms of characteristic exhaust velocity, was 98 percent of theoretical at contraction ratios greater than 3 but decreased very rapidly at smaller contraction ratios. The heat-transfer rate increased with increasing contraction ratio and chamber pressure;it was about 1 Btu per square inch per second at a contraction ratio of 1.5 and increased to-about 3 at a contraction ratio of6.