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Article
Error in hot-wire X-probe measurements induced by unsteady velocity gradients
| Authors: |
Fransson, J. H. M., Westin, K.J.A. |
| Document Type: |
Article |
| Pubstate: |
Published |
| Journal: |
Expriments in Fluids |
| Volume: |
32
413-415 |
| Year: |
2002 |
AbstractErrors in hot-wire X-probe measurements due to unsteady velocity gradients are investigated by a comparison of hot-wire and LDV-measurements (Laser Doppler Velocimetry). The studied flow case is a laminar boundary layer subjected to high levels of free stream turbulence, and the hot-wire data shows a local maximum in the wall-normal fluctuation velocity inside the boundary layer. The observed maximum is in agreement with existing hot-wire data, but in conflict with the present LDV-measurements as well as existing results from numerical simulations. An explanation to the measurement error is suggested in the paper.
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