Accession Number:

AD0263082

Title:

ANNULAR INTERNAL-EXTERNAL-EXPANSION ROCKET NOZZLES FOR LARGE BOOSTER APPLICATIONS

Descriptive Note:

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON D C

Report Date:

1961-09-01

Pagination or Media Count:

1.0

Abstract:

Annular nozzles with area ratios of 15 and 25 with free-stream airflow through the center as well as around the outside of the exiting jet were investigated in quiescent air and at Mach 2 and 3. Over a pressure-ratio range of 40 to 1000, the ratio of actual to ideal thrust was constant at approximately 0.98. Compared with conventional convergent-divergent nozzles, the performance of the annular internal-external expansion nozzle for representative boost missions could yield significant orbital payload increases. A single flap on the external-expansion surface of the 251 annular nozzle produced a side force equal to 4 of the axial force with no measura le loss in axial thrust. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE