Analytical Study of Ventilated Wind Tunnel Boundary Interference on V/STOL Models Including Wake Curvature and Decay Effects

Item

Title
Analytical Study of Ventilated Wind Tunnel Boundary Interference on V/STOL Models Including Wake Curvature and Decay Effects
Date
1974
Index Abstract
Not Available
Photo Quality
Not Needed
Report Number
AEDC TR 74-51
Corporate Author
ARO, Inc.
Laboratory
Propulsion Wind Tunnel Facility
Extent
59
Identifier
ADA000922
Access Rights
Approved for public release; distribution unlimited
Distribution Classification
1
Contract
None Given
DoD Project
None Given
DoD Task
None Given
DTIC Record Exists
No
Distribution Conflict
No
Abstract
The wind tunnel boundary interference on a V/STOL model is calculated in a rectangular test section with solid vertical walls and ventilated (perforated or slotted) horizontal walls. The interference is found by applying the small perturbation theory of an incompressible fluid to the boundary value problem. The theory uses an image method in addition to Fourier transforms with an equivalent homogeneous boundary condition on the ventilated wall. The mathematical representation of the V/STOL model accounts for the curvature and decay of the wake. The assumption of a constant wake strength produces a paradox in that the maximum value of the interference factors increases as the initial jet velocity decreases. It is indicated that a realistic representation of the wake decay may be as significant as the wake curvature in assessing interference on pitching moment, tail forces, or blockage effects. The most significant aspect of the analysis shows that nonlinear cross-flow effects at the tunnel boundary are important in the V/STOL case, and a quasi-linear approximation to these effects is introduced into the solution providing good agreement with experimental data.
Report Availability
Full text available
Date Issued
1974-11
Publisher
Arnold Air Force Station, TN : Propulsion Wind Tunnel Facility, Arnold Engineering Development Center, Air Force Systems Command
Provenance
Bombardier/Aero
Type
report
Format
1 online resource
Creator
Kraft, E. M.