The design-point performance of model internal-expansion propelling nozzles with area ratios up to 4

Abstract

The construction of a new dry air thrust rig is described, for testing model propelling nozzles in quiescent air, and its pretensions to accuracy are examined. Use has been made of certain types of convergent nozzle as a means of checking the absolute level of air mass flow measurement. Experimental results have been obtained for the performance of a family of conically divergent nozzles running correctly expanded, and compared with theoretical estimates of the contributory losses. Other basic shapes of internal-expansion nozzle, both axisymmetric and two-dimensional, have also been tested.