Straight Duct Supersonic Diffuser Flow in a Ludwieg Tube with Upstream Diaphragm.
YALE UNIV NEW HAVEN CONN DEPT OF ENGINEERING AND APPLIED SCIENCE
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The starting process of supersonic flow in a nozzle followed by constant area, straight duct diffusers was studied in a Ludwieg tube equipped with an upstream diaphragm. The time required to establish steady flow from rest at the exit of the supersonic nozzle was determined from shadowgraph pictures of the flow field, and from static pressure measurements. The initial pressure ratios across the diaphragm to start the supersonic flow at the nozzle exit are also reported. They are compared with the minimum pressure ratio required to sustain the flow at the nozzle exit during the first flow cycle of the Ludwieg tube operation.
- Fluid Mechanics