Abstract
At a previous meeting results based on wavelet analysis demonstrated similarities between triggered turbulent spots and the turbulent patches caused by wake interactions on compressor and turbine blading[1]. Hughes and Walker[2] went further and used wavelet conditioning to identify the prevalence of Tollmien-Schlichting instability phenomena in the flow over axial flow compressor blades. In the current investigation transition phenomena occurring in axial flow compressors are simulated on a larger scale to provide further evidence on the similarities between turbomachinery and wind tunnel flows. The applicability of the intermittency-based approaches to the closure of laminar separation bubbles is demonstrated. The spacing between impinging wakes is systematically varied and it is found that the calmed region acts to suppress turbulence, even for closely spaced wakes.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
REFERENCES
J. P. Gostelow, H. P. Hodson, and G. J. Walker, Comparisons between triggered turbulent spots and unsteady transition phenomena on compressor and turbine blading, in “Laminar-Turbulent Transition” eds. H. F. Fasel and W. S. Saric, Proc. IUTAM Symp., Sedona, AZ. pp. 365–370 (1999).
J. D. Hughes, and G. J. Walker, Natural transition phenomena on an axial compressor blade, ASME Journal of Turbomachinery, 123, pp. 392–401 (2001).
R. Narasimha, On the distribution of intermittency in the transition region of the boundary layer, J. Aero. Sci., Vol. 24, pp. 711–712 (1957).
W. J. Solomon, G. J. Walker, and J. P. Gostelow, Transition length prediction for flows with rapidly changing pressure gradients, ASME Journal of Turbomachinery, Vol. 118, pp. 744–751 (1996).
E. Gutmark, and R. F. Blackwelder, On the structure of a turbulent spot in a heated laminar boundary layer, Experiments in Fluids, Vol. 5, pp. 27–229 (1987).
R. L. Thomas, Closure of a laminar separation bubble by natural and wake-induced transition, PhD thesis, University of Leicester (2004).
E. Malkiel, and R. E. Mayle, Transition in a separation bubble, ASME Journal of Turbomachinery, Vol. 118, pp. 752–759 (1996).
R. J. Volino, and L. S. Hultgren, Measurements in separated and transitional boundary layers under low-pressure turbine airfoil conditions, ASME Paper 2000-GT-260 (2000).
W. Sanz, and M. F. Platzer, On the Navier-Stokes calculation of separation bubbles, ASME Paper 96-GT-487 (1996).
10.G. V. Hobson and S. Weber, Prediction of a laminar separation bubble over a controlled-diffusion compressor blade, ASME Paper 2000-GT-277 (2000).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2006 Springer
About this paper
Cite this paper
GOSTELOW, J., THOMAS, R. (2006). EFFECTS OF STRONG ADVERSE PRESSURE GRADIENTS AND INCIDENT WAKES ON TRANSITION AND CALMING. In: Govindarajan, R. (eds) IUTAM Symposium on Laminar-Turbulent Transition. Fluid Mechanics and Its Applications, vol 78. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4159-4_15
Download citation
DOI: https://doi.org/10.1007/1-4020-4159-4_15
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-3459-6
Online ISBN: 978-1-4020-4159-4
eBook Packages: EngineeringEngineering (R0)