Abstract
The influenceofexternal flowon the plume physicsof cell nozzle flows and the cell base wake behavior of simplified clustered linear aerospike nozzles were characterized using surface pressure measurement, flow visualization using the background oriented schlieren method, and theoretical modeling. The test model comprised three or four clustered cell nozzles, or a nonclustered two-dimensional nozzle with a designed Mach number of 3.5, and was connected to a straight section followed by a straight ramp inclined at 12 deg. In the cases with or without external flow, the measured pressure distributionson the surfaceof the test model were found to be different in the presence of external flow: The ramp surface pressures were maintained at a certain level above the environmental pressure according to the cell nozzle flow conditions, whereas the pressure distributions in the cases without external flow demonstrated highly periodical compression/expansion features. The results of flow visualization indicated that the pressure maintained on the ramp surface depends mainly on how the external flow controls the jet expansion by formingaslip surface. The cell base wake was found to behaveas aclosed wakein the presence ofexternal flow. Those pressure behaviors were successfully predicted using the physics-based theoretical models established in this study.
| Original language | English |
|---|---|
| Pages (from-to) | 1199-1212 |
| Number of pages | 14 |
| Journal | Journal of Propulsion and Power |
| Volume | 30 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2014 Sept 1 |
ASJC Scopus subject areas
- Aerospace Engineering
- Fuel Technology
- Mechanical Engineering
- Space and Planetary Science