Abstract
This paper presents an investigation on the effect of introducing large-scale roughness through static curvature modifications on the low speed flow over an airfoil. The surfaces of a standard NACA 4415 airfoil have been modified with regular perturbations or “bumps” of the order of 2%c for this purpose. While the actual NACA 4415 airfoil is not a suitable candidate for low Re cases due to extensive prevalence of boundary layer separation, it is expected that the bumps would exercise passive flow control by promoting early transition to turbulence, thereby reducing the extent of separation and improving the performance. From this investigation it has been found that the separation bubbles begin on the upper surface of the bumpy surface model is later than the regular surface model. This implies that the stall appears of bumpy surface model at higher attack angle than the regular surface model. The lift to drag ratio also increases for bumpy surface airfoil and consequently improve the performance of the wing. Experiments are conducted for chord based Re values ranging from 25,000 to 500,000
References
- E. L. Houghton and P. W. Carpenter, “Aerodynamics for Engineering Students”, Fourth Edition, Edward Arnold Publisher
- John D. Anderson, J.R, “Introduction to Flight”, Third Edition, Mc Graw-Hill International Editions, Aerospace Science Series
- Dr. P. N. Modi & Dr. S. M Seth, “Hydraulics and Fluid Mechanics Including Machine” (In SI Unit), new edition 2005-2006, Standard Book House
- William H. Rae, Jr. & Alan pope, “Low Speed Wind Tunnel Testing”, Second Edition, A Wiley – Inter science Publication
- Charles E. Dole, “Flight Theory and Aerodynamics”, A Wiley Interscience Publication.
- Bernard Etkin, “Dynamics of Flight- Stability and Control”, Third edition, John Wiley & Sons, INC.
- Donald T. Ward, “Introduction to Flight Test Engineering”, Elsevier Science Publishers.
Abstract
References
- E. L. Houghton and P. W. Carpenter, “Aerodynamics for Engineering Students”, Fourth Edition, Edward Arnold Publisher
- John D. Anderson, J.R, “Introduction to Flight”, Third Edition, Mc Graw-Hill International Editions, Aerospace Science Series
- Dr. P. N. Modi & Dr. S. M Seth, “Hydraulics and Fluid Mechanics Including Machine” (In SI Unit), new edition 2005-2006, Standard Book House
- William H. Rae, Jr. & Alan pope, “Low Speed Wind Tunnel Testing”, Second Edition, A Wiley – Inter science Publication
- Charles E. Dole, “Flight Theory and Aerodynamics”, A Wiley Interscience Publication.
- Bernard Etkin, “Dynamics of Flight- Stability and Control”, Third edition, John Wiley & Sons, INC.
- Donald T. Ward, “Introduction to Flight Test Engineering”, Elsevier Science Publishers.
Details
| Other ID | JA65JF24PK |
|---|---|
| Journal Section | Articles |
| Authors | |
| Publication Date | September 1, 2010 |
| Published in Issue | Year 2010 Volume: 2 Issue: 3 |