1. Implementation of Vortex Cavities in a Turbojet Diffuser Sponsor: Williams International
Progress Report 2
November 2nd, 2006
TEAM CRUISE CONTROL
Michael Feldman
Marvin Kong
Nansi Xue

2. Table of Contents
CFD analysis using Fluent® on regular model and shortened model
Redesign of vortex cavity control

3. CFD Analysis CFD done on 3 different baseline models Regular length
Shortened by 1 inch
Shortened by 2 inches
Varying degrees of flow separation for three baseline models

4. CFD Analysis
Minimal flow separation for unmodified model

5. CFD Analysis
Minimal flow separation for unmodified model

6. CFD Analysis
Flow separation midway through the 1-inch shorter model

7. CFD Analysis
Flow separation midway through the 1-inch shorter model

8. CFD Analysis
Flow separation near inlet for the 2-inch shorter model

9. CFD Analysis
Flow separation near inlet for the 2-inch shorter model

10. Vortex Cavity Re-Design
Current vortex cavity is not feasible due to adverse pressure gradient
Other cavity design has to be considered
Higher Pressure
Lower pressure
Flow direction

11. Outside Assistance Conversation with Prof. Powell on last Friday
Two Methods of Improving Boundary Layer Control
Suction
Blowing
Diffuser Air flow
Diffuser wall
Flow is sucked
downstream
Diffuser Air flow
Additional flow to impart to push boundary layer
Diffuser wall

12. Questions?