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Direct measurements of skin friction in a turbulent boundary layer with a strong adverse pressure gradient
| Content Provider | Scilit |
|---|---|
| Author | Frei, D. Thomann, H. |
| Copyright Year | 1980 |
| Description | This paper describes a new balance, suitable for direct measurement of skin friction in turbulent boundary layers with severe pressure gradients. The gaps between the floating element and the surrounding wall are filled with a liquid in order to eliminate disturbing pressure forces on the element. The resulting friction forces are measured with piezo-electric transducers with high sensitivity and extremely small element displacement.Skin friction measurements were taken in the turbulent boundary layer of a wind tunnel with circular cross-section at M [les ] 0·25. Severe adverse pressure gradients were generated by means of a step on the wall or, alternatively, by a conical centre body.The new apparatus was mainly used to investigate the error of Preston tubes in adverse pressure gradients. It was necessary to develop a new measuring technique to improve the repeatability of the Preston tube readings.The Preston tube error was found to depend on both the local pressure gradient P = (dp/dx) ν/ρ^{3}$_{τ}$ and on the Preston tube diameter $u_{τ}$d/ν and to be independent of the upstream pressure distribution for the range of parameters covered by the experiments. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/35E584BCAA1102A569806010C89A2937/S0022112080001541a.pdf/div-class-title-direct-measurements-of-skin-friction-in-a-turbulent-boundary-layer-with-a-strong-adverse-pressure-gradient-div.pdf |
| Ending Page | 95 |
| Page Count | 17 |
| Starting Page | 79 |
| ISSN | 00221120 |
| e-ISSN | 14697645 |
| DOI | 10.1017/s0022112080001541 |
| Journal | Journal of Fluid Mechanics |
| Issue Number | 1 |
| Volume Number | 101 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 1980-11-13 |
| Access Restriction | Open |
| Subject Keyword | Journal of Fluid Mechanics Pressure Gradient Turbulent Boundary Layer Pressure Distribution |
| Content Type | Text |
| Resource Type | Article |
| Subject | Applied Mathematics Mechanics of Materials Condensed Matter Physics Mechanical Engineering |
