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Improved k-ω-γ transition model by introducing the local effects of nose bluntness for hypersonic heat transfer.
- Source :
-
International Journal of Heat & Mass Transfer . Apr2018, Vol. 119, p185-198. 14p. - Publication Year :
- 2018
-
Abstract
- After considering the local effects of nose bluntness on the transition, a modification for the timescale of the second mode in the three-equation k-ω-γ transition model has been proposed to improve the hypersonic transition past cones. The ratio of local unit Reynolds number over freestream unit Reynolds number ( Re local / Re ∞ ) is introduced to delay and reduce the development of second mode instability, according to the results of linear stability theory. The hypersonic transitions past a cone with three nose radii at the angle of attack of 0° were simulated to calibrate the new model and its constants. Then, the improved model is extended to predict the hypersonic transitions past the cones with larger radius and at non-zero angles of attack. Despite the original model can reflect the transition trend, the improved model performs much better than the original one when comparing with the available measurements. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00179310
- Volume :
- 119
- Database :
- Academic Search Index
- Journal :
- International Journal of Heat & Mass Transfer
- Publication Type :
- Academic Journal
- Accession number :
- 126898371
- Full Text :
- https://doi.org/10.1016/j.ijheatmasstransfer.2017.11.103