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Evaluation of a Complete Wake Integral for the Drag of a Car-Like Shape
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Abstract
Maskell's approach for performing drag integrals in far-field fully-developed three-dimensional wakes has been extended for near-field application. The extended theory has been applied to wake survey data at two traverse stations involving a stalled wing, and an idealized car model tested over a fixed ground at two yaw angles. As a spin-off, cross-flow velocity vector plots have been resolved into vorticity-driven and source-driven components, which give added insight into complicated flows.
The new extension appears to work well in application to the test data, but correlations with balance measurements were compromised by fixed-floor flow problems. A limited review suggests that, while problems of wake definition may be soluble at zero yaw, changes in flow topology may negate comparable solutions with the model yawed. These difficulties are circumvented if a moving ground is employed.
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Topic
Citation
Hackett, J. and Sugavanam, A., "Evaluation of a Complete Wake Integral for the Drag of a Car-Like Shape," SAE Technical Paper 840577, 1984, https://doi.org/10.4271/840577.Also In
Automobile Aerodynamics; Wakes, Wind Effect, Vehicle Development
Number: SP-0569; Published: 1984-03-01
Number: SP-0569; Published: 1984-03-01
References
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- Maskell E. C. “Progress Towards a Method of Measurement of the Components of the Drag of a Wing of Finite Span” Royal Aircraft Establishment Technical Report 72232 January 1973
- Wu J. C. Hackett J. E. Lilley D. E. “A General Wake Integral Approach for Drag Determination in Three-Dimensional Flows” AIAA Paper No. 79-0279 (Revised) 17th Aerospace Sciences Meeting New Orleans January 1979
- Hackett J. E. Wilsden D. J. Stevens W. A. “A Review of the “Wall Pressure Signature” and Other Tunnel Constraint Correction Methods for High Angle-of-Attack Tests” AGARD Report No. 692 Pa May 1980 AGARD Fluid Dynamics Panel Round Table Discussion on High Angle-of-Attack Testing Munich, F. R. G 8 May 1980
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- Hackett J. E. Wu J. C. “Drag Determination and analysis from Three-Dimensional Wake Measurements” ICAS Paper No. 82-644 13th 1 CAS Congress Seattle August 1982