Wind Tunnel Wall Interference.
Interim rept. 1 Apr 77-1 Apr 78,
PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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A progress report on two aspects of theoretical research on improved understanding and reduction of wind tunnel wall interference is given. In part I, the compliant wall concept is studied for steady, two-dimensional supersonic flow. The compliant wall is modeled as a hinged plate with a torsional spring restraint. The combinations of flow dynamic pressure, wall geometry and wall compliance which lead to minimum wall interference with the flow over a lifting airfoil are identified. In part II, an improved theoretical model for flow over and through a slotted wall is constructed. The model takes into account streamline curvature in the direction of flow as well as flow through the slot perpendicular to the direction of flow. The theoretical relationship which is obtained between pressure differential across the slot and mass flow through the slot shows both the linear and quadratic regimes observed in experiments. Quantitative agreement with existing experimental data is also encouraging. Author
- Test Facilities, Equipment and Methods
- Fluid Mechanics