Geometric Effects on the Performance Characteristics of Very Small Nozzles.
Abstract
Pressure measurements and schlieren photographs were used to analyze the performance characteristics of very small (nozzles with a throat dimension less than 0.045 in.), 2-D, supersonic nozzles. The nozzle configurations had diverging wall angles between 5 and 30 degrees, and nozzle lengths between 0.126 in. and 0.835 in. Each configuration was tested at throat dimensions of 0.045 in., 0.030 in., 0.015 in., and 0.007 in. All test runs were made with the p sub C/P sub a ratio equal to 100. The limit on smallness was determined to be a critical throat dimension near 0.015 in. Near and below this throat size conventional equations fail to suitably predict performance characteristics. Boundary layer growth seems to be closely related to the limit on smallness. Diverging wall angle has a greater effect on performance than does the nozzle length for all conditions investigated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1970
- Accession Number
- AD0914302
Entities
People
- Karl J. Jindra
Organizations
- Air Force Institute of Technology