Effects of turbulence induced by micro vortex generators on shockwave : boundary layer interactions

• Autorzy: Sznajder J. , Kwiatkowski T.

Identyfikatory

DOI

10.5604/12314005.1165445

• Języki publikacji: EN

Abstrakty

EN

Interactions between viscous and transonic effects in air flow around a laminar wing were investigated computationally by means of the solution of unsteady Reynolds-averaged Navier-Stokes Equations. The subject is important from the point of view of applications of Natural Laminar Flow technology in modern, economically efficient passenger aircraft. The research was focused on simulations and analyses of influence of turbulence induced by micro vortex generators on intensity of harmful transonic phenomena like strong shock waves and buffet. Two ways of modelling of the effects of turbulators – the micro vortex generators were taken into consideration. The first way consisted in resolving the shape and inclination angle of the generator in the grid over airfoil and setting the non-slip wall boundary condition on the surface of the generator. The second way, taking advantage of the BAY model of vortex generator, was implemented on orthogonal grid without the need of resolving the shape of the vortex generator in the grid. Calibration of the BAY model was aimed at producing similar distribution of vorticity and velocity circulation behind the model of the vortex generator, as obtained for the grid-resolved model of the vortex generator. The calibration procedure resulted, however, in overestimated turbulisation of the boundary layer in the BAY model, compared to the effects of the grid-resolved vortex generator. The flow simulations indicated, however, that turbulisation of boundary layer induced by micro vortex generators can reduce or eliminate the oscillation of strong shock wave and buffet in off-design conditions and that further adjusting of the BAY model is an efficient strategy for modelling the interactions between viscous and transonic effects in air flow around a laminar wing.

Słowa kluczowe

EN

transonic flow control; laminar-turbulent transition; vortex generators; flow simulations; BAY method

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2015
• Tom: Vol. 22, No. 2
• Strony: 241--248
• Opis fizyczny: Bibliogr. 3 poz., rys.

Twórcy

autor

Sznajder J.

• Institute of Aviation, Department of Aerodynamics Krakowska Avenue 110/114, 02-256 Warsaw, Poland tel.: [phone] ext. 492, fax: [phone]

autor

Kwiatkowski T.

• Institute of Aviation, Department of Aerodynamics Krakowska Avenue 110/114, 02-256 Warsaw, Poland tel.: [phone] ext. 492, fax: [phone]

Bibliografia

• [1] Bender, E. E., Anderson B. H., Yagle, P. J., Vortex generator modelling for Navier-Stokes codes, American Society for Mechanical Engineers, FEDSM 99-6919, New York 1999.
• [2] Langtry, R. B., Menter, F. R., Transition modeling for general CFD applications in aero-nautics, AIAA 2005-522, 2005.
• [3] Rokicki, J., Stalewski, W., Żółtak, J., Evolutionary methods for design, optimization and control, eds: T. Burczynski and J. Périaux, CIMNE, Barcelona, Spain 2009.