Separation control with elliptical air-jet vortex generators
نویسندگان
چکیده
Abstract The flow organisation of air-jet vortex generators (AJVGs) elliptical cross sections and their control effectiveness on a $$24^{\circ }$$ 24 ∘ -compression-ramp-induced shock-wave/boundary-layer interaction was analysed the basis experiments at $$M_{\infty } = 2.52$$ M ∞ = 2.52 $$Re_{\theta _c} 8225$$ R e θ c 8225 . We investigated circular orifice two orifices aspect ratios 0.5 2; all characterised by same hydraulic diameter. Measurements separation lengths from oil-flow visualisation PIV reveal that AJVGs achieve $$25\%$$ 25 % reduction in total length, which constitutes strong improvement over $$17\%$$ 17 achieved with commonly used AJVGs. jet-induced structures penetrate average farther into boundary layer. However, lateral spread is limited to maximum value equal inter-jet spacing array, highlights onset jet/jet interactions between adjacent jets array. A consequence these better entrainment for cases, as observed mean boundary-layer velocity profiles an improved turbulent mixing (indicated increase Reynolds-shear-stress magnitude).
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ژورنال
عنوان ژورنال: Experiments in Fluids
سال: 2023
ISSN: ['0723-4864', '1432-1114']
DOI: https://doi.org/10.1007/s00348-023-03637-4