Control of a Mach reflection-induced interaction using an array of vane-type vortex generators

Control of a Mach reflection-induced interaction using an array of vane-type vortex generators An experimental investigation was conducted to control a Mach reflection (MR)-induced flow separation in a Mach 2.05 flow using a 18 $$^{\circ }$$ ∘ shock generator (SG). The study was extended to four SG exit heights (g / w) of 0.87, 0.81, 0.725, and 0.66 primarily to study its effect on the extent of flow separation as well as on Mach stem height, with and without control. Two vane-type vortex generator configurations, namely the ramp vane (RV) with device heights $$h/\delta = 0.3, 0.5, 0.8$$ h / δ = 0.3 , 0.5 , 0.8 , and 1.0 and the rectangular vane (RRV) with $$h/\delta = 0.3$$ h / δ = 0.3 and 0.5, were studied for control. Each control device array was implemented 10 $$\delta$$ δ upstream of the separation location for no control. For stable MR interactions (i.e., $$g/w = 0.87, 0.81$$ g / w = 0.87 , 0.81 ), the extent of separation and the reattachment shock strength are seen to decrease with increase in RV height (with $$h/\delta =1.0$$ h / δ = 1.0 device showing 17% reduction). However, for unstable MR condition (i.e., $$g/w = 0.725$$ g / w = 0.725 ), RV devices of $$h/\delta = 0.8$$ h / δ = 0.8 and 1.0 become ineffective. The RRV2 device ( $$h/\delta =0.5$$ h / δ = 0.5 ), on the other hand, was found to be more effective in reducing the extent of separation in both the stable (31%) and unstable (24%) MR conditions. The effectiveness of each control device is also accompanied with an increase in height of the Mach stem. This is, however, not seen as a serious limitation since in such strong interactions it is more important to prevent or avert an intake unstart condition. The separation shock unsteadiness or the $$\sigma _{\mathrm{max}}/P_{\mathrm{w}}$$ σ max / P w value, on the other hand, is seen to increase considerably with controls and seems to be almost independent for $$h/\delta \ge 0.5$$ h / δ ≥ 0.5 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Shock Waves Springer Journals

Control of a Mach reflection-induced interaction using an array of vane-type vortex generators

, Volume 28 (4) – Nov 24, 2017
14 pages

/lp/springer_journal/control-of-a-mach-reflection-induced-interaction-using-an-array-of-MT6VEUFBqT
Publisher
Springer Berlin Heidelberg
Subject
Engineering; Engineering Thermodynamics, Heat and Mass Transfer; Fluid- and Aerodynamics; Engineering Fluid Dynamics; Thermodynamics; Acoustics; Condensed Matter Physics
ISSN
0938-1287
eISSN
1432-2153
D.O.I.
10.1007/s00193-017-0780-2
Publisher site
See Article on Publisher Site

Abstract

An experimental investigation was conducted to control a Mach reflection (MR)-induced flow separation in a Mach 2.05 flow using a 18 $$^{\circ }$$ ∘ shock generator (SG). The study was extended to four SG exit heights (g / w) of 0.87, 0.81, 0.725, and 0.66 primarily to study its effect on the extent of flow separation as well as on Mach stem height, with and without control. Two vane-type vortex generator configurations, namely the ramp vane (RV) with device heights $$h/\delta = 0.3, 0.5, 0.8$$ h / δ = 0.3 , 0.5 , 0.8 , and 1.0 and the rectangular vane (RRV) with $$h/\delta = 0.3$$ h / δ = 0.3 and 0.5, were studied for control. Each control device array was implemented 10 $$\delta$$ δ upstream of the separation location for no control. For stable MR interactions (i.e., $$g/w = 0.87, 0.81$$ g / w = 0.87 , 0.81 ), the extent of separation and the reattachment shock strength are seen to decrease with increase in RV height (with $$h/\delta =1.0$$ h / δ = 1.0 device showing 17% reduction). However, for unstable MR condition (i.e., $$g/w = 0.725$$ g / w = 0.725 ), RV devices of $$h/\delta = 0.8$$ h / δ = 0.8 and 1.0 become ineffective. The RRV2 device ( $$h/\delta =0.5$$ h / δ = 0.5 ), on the other hand, was found to be more effective in reducing the extent of separation in both the stable (31%) and unstable (24%) MR conditions. The effectiveness of each control device is also accompanied with an increase in height of the Mach stem. This is, however, not seen as a serious limitation since in such strong interactions it is more important to prevent or avert an intake unstart condition. The separation shock unsteadiness or the $$\sigma _{\mathrm{max}}/P_{\mathrm{w}}$$ σ max / P w value, on the other hand, is seen to increase considerably with controls and seems to be almost independent for $$h/\delta \ge 0.5$$ h / δ ≥ 0.5 .

Journal

Shock WavesSpringer Journals

Published: Nov 24, 2017

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