Penetration and Spreading of Liquid Jets in an External-Internal Compression Inlet

Livingston, T.; Segal, Corin; Schindler, M; Vinogradov, Viacheslav A.

doi:10.2514/2.1082

Cited by 40 publications

(14 citation statements)

References 14 publications

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“…If a flammable mixture of fuel and air resides in the boundary layer, it is possible that combustion could occur well upstream of the combustor, resulting in potentially catastrophic consequences. Results from these studies [11][12][13] suggested that pylon-aided fuel injection could enhance the fuel jet penetration into the supersonic flow, compared with simple wall injection without a pylon. Results also suggested that little, if any, fuel remained in the near-wall region.…”

Section: Nomenclaturementioning

confidence: 99%

“…Pylon-aided fuel injection has been investigated as a method for introducing liquid or gaseous fuel into the supersonic airstream in the inlet duct well upstream of the combustor [11][12][13]. In this approach, a small aerodynamically shaped fin (called a pylon) is positioned just upstream of a fuel injector.…”

Section: Nomenclaturementioning

confidence: 99%

“…1; the details of each of the three configurations employed in this study are provided in Table 1. These pylons were designed based on earlier results [11][12][13]. Figure 2 contains a schematic of a typical pylon-injector configuration as installed into the flowpath.…”

Section: B Pylon-injector Geometriesmentioning

confidence: 99%

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

Gruber¹,

Carter²,

Montes³

et al. 2008

Journal of Propulsion and Power

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information AFRL-RZ-WP-TP-2008-2170 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING AGENCY ACRONYM(S)Air Force SPONSORING/MONITORING AGENCY REPORT NUMBER(S) AFRL-RZ-WP-TP-2008-2170 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTESPAO case number AFRL/WS07-0430, 28 February 2007. This is a work of the U.S. Government and is not subject to copyright protection in the United States. Document contains color. ABSTRACTAn investigation of the nonreacting flow associated with pylon-aided gaseous fuel injection into a Mach 2 crossflow is described. In this study, a small pylon was positioned just upstream of a circular flush-wall fuel injector. Three pylon geometries were studied, along with a no-pylon reference case. In all cases, a typical cavity-based flameholder was positioned downstream of the fuel injector. The injectant plume characteristics were interrogated using a variety of laser-based and probe-based measurement techniques. Planar laser-induced fluorescence of nitric oxide was used to study the instantaneous plume structure. Spontaneous vibrational Raman scattering provided time-averaged plume characteristics and mixing information. Probe-based instrumentation was used in conjunction with the mixing data to estimate the total pressure losses associated with each configuration. Each pylon had a unique influence on the fuel-injection plume. In all cases, the presence of the pylon resulted in improved fuel penetration into the supersonic crossflow without significantly changing the total pressure-loss characteristics. Mixing efficiencies of the pylonaided injection cases were not substantially different from the reference case. An investigation of the nonreacting flow associated with pylon-aided gaseous fuel injection into a Mach 2 crossflow is described. In this study, a small pylon was positioned just upstream of a circular flush-wall fuel injector. Three pylon geometries were studied, along with a no-pylon reference case. In all cases, a typical cavity-based flameholder was positioned downstream of the fuel injector. The injectant plume characteristics were interrogated using a variety of laser-based and probe-based measurement techniques. Planar laser-induced fluorescence of nitric oxide was used to study the instantaneous plume structure. Spontaneous vibrational Raman scattering provided time-averaged plume characteristics and mixing information. Probe-based instrumentation was u...

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Section: Nomenclaturementioning

confidence: 99%

Section: Nomenclaturementioning

confidence: 99%

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

Gruber¹,

Carter²,

Montes³

et al. 2008

Journal of Propulsion and Power

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show abstract

“…Combined with injection, the shock-jet interactions created by these devices cause vorticity via baroclinic torque and cross-stream shear and may improve mixing. 2 This concept may be applied to an upstream pre-injection mechanism that aims to provide a well mixed flow over a downstream cavity. Injection behind pylons also causes an increase in the penetration height of the fuel for a given dynamic pressure ratio, defined later.…”

Section: Mixing Effects Of Pylon-aided Fuel Injection Located Upstreamentioning

confidence: 99%

“…Optimal pylon heights, widths, and pylon distances from injection were determined from previous computational research 4 and correlate with sizes used in prior experimentation. [2][3] The investigation included measuring the effects of penetration height and width, shock effects, mixing effectiveness and pressure profiles.…”

Section: Mixing Effects Of Pylon-aided Fuel Injection Located Upstreamentioning

confidence: 99%