Effects of Nozzle Geometry and Diaphragm Location on the Starting Process in a Ludwieg Tube
Abstract
The starting process in the Ludwieg tube, an intermittent type wind tunnel, was experimentally investigated. Starting flow with varying initial supply gas pressure, nozzle geometry, and downstream diaphragm location, was studied. Two types of closed jet nozzle configurations were used: uniform flow M = 1.6 nozzles, and wedge type M = 1.6 nozzles. Dry air at 1, 2, and 3 atm pressure and room temperature served as the test gas. Starting times were determined from static pressure recordings, made at the exit of the nozzle, and the presence or absence of starting shock waves was confirmed by high speed shadowgraph films of the flow. A dimensional analysis that relates nozzle starting time to the supply conditions, nozzle inlet angle, nozzle contraction ratio, and distance to the diaphragm was performed, and it was found to correlate the measurements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1973
- Accession Number
- AD0755357
Entities
People
- Francis Mosnier
- Leo T. Smith
Organizations
- Yale University