Thrust Vector Control of Rectangular Jets using Counterflow.
Abstract
This research studied the flow generated by a rectangular convergent-divergent Mach 2 nozzle operated in a free jet and a counterflow thrust vectored configuration. Particle Image Velocimetry was used to obtain 2D velocity fields and total and static pressures were measured. In the free jet configuration, the nozzle was operated at ideal, over, and underexpanded conditions. The growth of shear layers was unaffected by shock cells for mildly off-design conditions. The thrust vector configuration is similar to an ejector, where suction is applied to one side of the jet. This creates a cross-stream pressure gradient resulting in a vectoring of the jet. The application of suction creates counterflow. This gives the jet a streamwise curvature, the destabilizing nature of which causes an increase in the growth of the non- suction side of the shear layer. The suction side shear layer experiences counterflow and both destabilizing and stabilizing curvature. It becomes thicker with suction, suggesting a self-excited state.The development of large scale structures when suction is applied gives further evidence of self-excitation. These structures cause enhanced mixing resulting in the cross-stream pressure gradient which leads to vectoring.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 07, 1995
- Accession Number
- ADA299590
Entities
People
- A. Krothapalli
- D. J. Forliti
Organizations
- Florida State University