Experimental Studies of Pylon-Aided Fuel Injection into a Supersonic Crossflow

Gruber, Mark; Carter, Campbell D.; Montes, Daniel R.; Haubelt, Lane C.; King, Paul I.; Hsu, K. Y.

doi:10.2514/1.32231

Cited by 51 publications

(17 citation statements)

References 26 publications

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“…The resulting displacement in the tunnel cross-sectional area by this geometry (see Table 3) was equivalent to an 8.5 deg constant-angle ramp for the same footprint area as the base of the fin or a 0.7 deg ramp if the entire span of the wind-tunnel test section was considered. Finally, the size of the orifice and fin was significantly larger in scale compared to other similar injectors and pylons reported in the literature [22][23][24][25][26][27][28] to obtain larger and more detailed visualizations of the jet.…”

Section: Methodsmentioning

confidence: 95%

Supersonic Mixing Enhancement Using Fin-Guided Fuel Injection

Aguilera

2015

Journal of Propulsion and Power

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The mixing flowfields of transverse walled fuel injection with and without the guidance of a fin in a Mach 2.2 flow were experimentally characterized and compared. This study evaluated the ability of fin-guided injection to enhance fuel-air mixing while reducing shock-induced stagnation pressure losses. The nonreacting gaseous injection experiments used helium as a hydrogen surrogate and simulated four mass flow rate conditions to investigate the performance of the proposed injection scheme with variable jet momentum. The analysis of schlieren visualizations demonstrated a 100-200% increase in jet penetration for the fin-guided cases over the baseline 12 diameters downstream of the injection point. Wall pressure measurements were correlated to the schlieren results which showed that the strength of the jet-induced shock in the baseline was reduced by 33-47% by using the fin. A planar-Mie scattering method used to obtain cross-sectional views of the injection flowfields revealed that the fin was not only responsible for raising the fuel jet away from the wall but also enabled its vertical spreading. The present results demonstrate that this fin geometry can enhance mixing via increased penetration and spreading, reduce the strength of jet-induced shocks, and potentially displace the reaction zone away from the combustor wall. Nomenclature A = area D = injector orifice diameter h, l, w = height, length, and width, respectively J = jet to freestream momentum ratio M = Mach number _ m = mass flow rate P = pressure Re = Reynolds number r = injector orifice radius T = temperature u = velocity x, y, z = x, y, z coordinate directions, respectively Δ = Delta δ = shock deflection angle ρ = density τ = tunnel steady-state time 0 = stagnation condition Subscripts B, F = baseline and fin guided, respectively blo = blockage, for blockage area inj = injector j = jet p = injector proximity ts = test section 1 = condition upstream of jet-induced shock 2 = condition downstream of jet-induced shock 3 = combustor inlet condition ∞ = freestream

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Section: Methodsmentioning

confidence: 95%

Supersonic Mixing Enhancement Using Fin-Guided Fuel Injection

Aguilera

2015

Journal of Propulsion and Power

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“…The Injection in inlet or isolator also enhances mixing, flame stability and combustion efficiency. In an experimental study by Gruber et al [35] three pylon geometries are compared with 7 no Pylon case having a cavity based flame holder downstream. In all cases presence of pylon result in increased fuel penetration, removed the injectant remain near wall compared with no pylon case and it is also observed that pressure loss were not significantly influenced.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of mixing enhancement using pylon in supersonic flow

Vishwakarma

Vaidyanathan

2016

Acta Astronautica

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“…Many mixing enhancement devices have been proposed in recent years, including transverse jet (Lee and Mitani, 2003;Huang et al, 2012b;2012c), ramp (Alexander et al, 2006;Huang et al, 2013b), strut (Huang et al, 2011c;Sujith et al, 2013), pylon (Gruenig et al, 2000;Gruber et al, 2008;Takahashi et al, 2010;Lee, 2012;Pohlman and Greendyke, 2013), and cavity (Yu and Schadow, 1994;Huang et al, 2012a;2013a), as well as double cavities in parallel or tandem (Huang et al, 2011b) and some combinations (Hsu et al, 2010;Grady et al, 2012). These devices can provide an axial vortex which has been proved to be responsible for improving mixing in supersonic flows.…”

Section: Introductionmentioning

confidence: 99%

Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

Huang

Ding

et al. 2016

JZUS-A

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Abstract:An efficient mixing process is very important for the engineering implementation of an airbreathing propulsion system. The air and injectant should be mixed sufficiently before entering the combustor. Two new wall-mounted cavity configurations were proposed to enhance the mixing process in a conventional transverse injection flow field. Their flow field properties were compared with those of a system with only transverse injection ports. Grid independency analysis was used to choose a suitable grid scale, and the mixing efficiencies at four cross-sectional planes (namely x=20, 40, 60, and 80 mm, which are just downstream of the jet orifice) were compared for the configurations considered in this study. The results showed that hydrogen penetrated deeper when a cavity was mounted upstream of the transverse injection ports. This is beneficial to the mixing process in supersonic flows. The mixing efficiency of the configuration with the wall-mounted cavity was better than that of the conventional physical model, and the mixing efficiency of the proposed novel physical model I (98.71% at x=20 mm) was the highest of all. In the case with only transverse injection ports, the vortex was broken up by the strong interaction between the shear layer over the cavity and the jet.

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Experimental Studies of Pylon-Aided Fuel Injection into a Supersonic Crossflow

Cited by 51 publications

References 26 publications

Supersonic Mixing Enhancement Using Fin-Guided Fuel Injection

Supersonic Mixing Enhancement Using Fin-Guided Fuel Injection

Experimental study of mixing enhancement using pylon in supersonic flow

Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

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