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A laser-induced heat flux technique for convective heat transfer measurements in high speed flows
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Keith Jr., T. G. Hingst, W. R. Porro, A. R. |
| Copyright Year | 1991 |
| Description | A technique is developed to measure the local convective heat transfer coefficient on a model surface in a supersonic flow field. The technique uses a laser to apply a discrete local heat flux at the model test surface, and an infrared camera system determines the local temperature distribution due to the heating. From this temperature distribution and an analysis of the heating process, a local convective heat transfer coefficient is determined. The technique was used to measure the local surface convective heat transfer coefficient distribution on a flat plate at nominal Mach numbers of 2.5, 3.0, 3.5, and 4.0. The flat plate boundary layer initially was laminar and became transitional in the measurement region. The experimentally determined convective heat transfer coefficients were generally higher than the theoretical predictions for flat plate laminar boundary layers. However, the results indicate that this nonintrusive optical measurement technique has the potential to measure surface convective heat transfer coefficients in high speed flow fields. |
| File Size | 9359109 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910021158 |
| Archival Resource Key | ark:/13960/t1fj7cg60 |
| Language | English |
| Publisher Date | 1991-01-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Supersonic Flow Convective Heat Transfer Temperature Distribution Laminar Boundary Layer Laser Heating Flat Plates Flow Distribution Boundary Layer Transition Heat Transfer Coefficients Infrared Imagery Heat Flux Boundary Layer Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
