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The Laminar Separation Sensor: An Advanced Transition Measurement Method for Use in Wind Tunnels and Flight
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English
Abstract
Current viscous drag reduction research explores the limits of practical applications of natural laminar flow (NLF) for airplane drag reduction. To better understand these limits, advanced measurement techniques are required to study the characteristics of laminar to turbulent boundary-layer transition. Recent NASA research indicates that the transition mode which involves laminar separation can be detected using arrayed hot-film laminar separation sensor concepts. These surface-mounted sensors can provide information on the location of the laminar separation bubble as well as bubble length. This paper presents two different laminar separation sensor configurations developed in the NASA program and presents results of wind-tunnel and flight evaluations of the sensors as tools to detect boundary-layer transition. Flight and wind-tunnel tests have shown the hot-film laminar separation sensor technique to be a viable means for detecting the existance of transition as well as Indicating reversed flow in a laminar separation bubble.
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Citation
Manuel, G., Carraway, D., and Croom, C., "The Laminar Separation Sensor: An Advanced Transition Measurement Method for Use in Wind Tunnels and Flight," SAE Technical Paper 871018, 1987, https://doi.org/10.4271/871018.Also In
References
- Holmes, B. J. Obara, C. J. Yip, L. P. Natural Laminar Flow Experiments on Modern Airplane Surfaces 1984
- Holmes, B. J. Croom, C. C. Gall, P. D. Manuel, G. S. Carraway, D. L. Advanced Transition Measurements Methods for Flight Applications 1986
- Gaster, M. The Structure and Behavior of Laminar Separation Bubbles AGARD Conference Proceedings 4 819 854 1966
- Horton. H. P. Laminar Separation Bubbles in Two and Three Dimensional Incompressible Flow Ph.D. Thesis University of London 1968
- Ntim, B. A. A Theoretical and Experimental Investigation of Separation Bubbles Ph.D. Thesis Queen Mary College 1969
- Mueller, T. J. Batill. S. M. Experimental Studies of the Laminar Separation Bubbles on a Two-Dimensional Airfoil at Low Reynolds Numbers 1980
- Holmes, B.J. et al Flight Investigation of Natural Laminar Flow on the Bellanca Skyrocket II SAE Paper 830717 1983
- Brendel, M. Mueller, T. J. Experimental Study of the Boundary Layer on a Low Reynolds Number Airfoil in Steady and Unsteady Flow Ph.D. Thesis University of Notre Dame 1986
- Crouch, J. D. Oscillating Hot-Wire Measurements Above an FX63-137 Airfoil 1986
- Sanborn, V. A. Resistance Temperature Tranducers Meterology Press Ft. Collins, CO. 408 1972
- Viken, J. K. Aerodynamic Design Considerations and Theoretical Results for a High Reynolds Number Natural Laminar Flow Airfoil MS. Thesis George Washington University 1983
- Gall, P. D. Holmes, B.J. Liquid Crystals for High-Altitude In-Flight Boundary Layer Flow Visualization 1986
- Steven, W. A. Goradia. S. H. Braden, J. A. Mathematical Model for Two-Dimensional Multi-Component Airfoils in Viscous Flow 1971
- Owen, F. K. Transition Experiments on a Flat Plate at Subsonic and Supersonic Speeds AIAA Journal 8 3 518 523 1970
- Obara, C. J. Holmes, B. J. Flight- Measured Laminar Boundary Layer Transition Phenomena including Stability Theory Analysis 1985
- Lobel, R. Identification of Flow Type Using Heated Thin Films OUEL Report No. 1238/78 University of Oxford 1978
- Degani, D. Effect of a Buried-Wire Gage on the Separation Bubble -Numerical Study AIAA Journal 22 11 1984
- Rubesin, M. H. et al A Hot-wire Surface Gage for Skin Friction and Separation Detection Measurements 1975
- Davis, R. L. Carter, J. E. Analysis of Airfoil Transitional Separation Bubbles 1984
- Bloch, D. R. Mueller, T. J. Effects of Distributed Grit Roughness on Separation and Transition on a Airfoil at Low Reynolds Numbers 1986
- Burrer, G. J. Stetson, N. B. Terrell, M. C Fast Scan Infrared imaging Devices SPIE Infrared Technology 62 227 229 1975