Accession Number : AD0288897

Title :   THE INFLUENCE OF DUAL INJECTION SLOTS ON THE FILM COOLING OF ROCKET MOTOR COMBUSTION CHAMBERS

Corporate Author : PURDUE UNIV LAFAYETTE IND

Personal Author(s) : GUINN,GERALD RAY

Report Date : JAN 1963

Pagination or Media Count : 1

Abstract : A cylindrical chamber rocket motor employing gaseous hydrogen and air as propellants was utilized to determine the film cooling requirements when the film coolant is injected through two circumferential slots at different axial locations. The motor was operated at three different Reynolds numbers and at one nominal chamber pressure and combustion gas temperature. The length of the upstream film cooled section remained constant at 4 in. while the downstream film cooled section was varied from 8 in. to 4 in. Water and ethyl alcohol were utilized as the film cooling agents. A simplified analysis was developed which adequately represented the experimental results over the range of parameters investigated. Experimental results showed that the film cooling requirements for a section of combustion chamber were reduced by as much as 65% when it was downstream of another liquid film cooled section. An increase in film coolant flow rate for a downstream film cooled section would result in a proportionally larger increase in film cooled length than would occur for the same increase in coolant flow for a single film. (Author)

Descriptors :   *FILM COOLING, *ROCKET ENGINES, AIR, COMBUSTION CHAMBERS, COOLANTS, EFFECTIVENESS, ETHANOLS, GASEOUS ROCKET PROPELLANTS, HEAT TRANSFER, HYDROGEN, INJECTION, LIQUID COOLED, MATHEMATICAL ANALYSIS, ORIFICES, PRESSURE, TEMPERATURE, TEST EQUIPMENT, TEST METHODS, TESTS, WATER

Distribution Statement : APPROVED FOR PUBLIC RELEASE