Effect of Injection Slot Size on the Performance of Coflow Jet Airfoil

Autor:	Adam P. Wells, Clark A. Conley, Craig D. Paxton, Brace F. Carroll, Gecheng Zha
Rok vydání:	2006
Předmět:	Airfoil Lift coefficient Materials science Angle of attack business.industry Aerospace Engineering Stall (fluid mechanics) Mechanics Physics::Fluid Dynamics Adverse pressure gradient Optics Drag Mass flow rate business Wind tunnel
Zdroj:	Journal of Aircraft. 43:987-995
ISSN:	1533-3868 0021-8669
Popis:	Two coflowjet airfoils with injection slot size differing by a factor of 2 are tested in a wind tunnel to study the effect of injection slot size. At the same angle of attack, the larger injection slot size airfoil passes about twice the jet mass flow rate of the smaller injection slot size airfoil. The smaller injection slot size airfoil is more effective in increasing the stall margin and maximum lift, whereas the larger slot coflow jet airfoil is more effective in reducing drag. To achieve the same lift, the smaller injection slot size airfoil has much less energy expenditure than the larger injection slot airfoil. A coefficient of jet kinetic energy is introduced, which appears to correlate well with the maximum lift and stall margin when coflow jet airfoil geometry varies. Both the jet kinetic energy coefficient and the momentum coefficient correlate well with drag reduction. No optimization of the airfoil configuration is pursued in this research, and the results indicate that there is a great potential for coflow jet airfoil performance improvement.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f32713ed599e852d6140f02e6b3d15aa https://doi.org/10.2514/1.16999 Zobrazit plný text záznamu