Mixing Effects of Pylon-Aided Fuel Injection Located Upstream of a Flameholding Cavity in Supersonic Flow

Montes, Daniel R.

doi:10.2514/6.2005-3913

Cited by 15 publications

(13 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All pylons increase the penetration height and reduce the amount of fuel located near the floor, compared with the reference case. Images from cases operated at reduced q (not shown) reveal similar features [18,26].…”

Section: Ensemble-averaged and Standard-deviation Imagesmentioning

confidence: 52%

“…In this effort, the pylonaided injector was examined in the context of a typical hydrocarbonfueled combustor flowpath that included a cavity-based flameholder. In this way, examinations of the interaction between the flameholder and the injector were possible [18,19]. Nonintrusive and probe-based measurement techniques were used to investigate the instantaneous and time-averaged characteristics of the fuel plume, the fuel-air mixing process, and the pressure losses associated with the pyloninjector flowfield.…”

Section: Nomenclaturementioning

confidence: 99%

See 1 more Smart Citation

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

Gruber¹,

Carter²,

Montes³

et al. 2008

Journal of Propulsion and Power

View full text Add to dashboard Cite

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...

show abstract

Section: Ensemble-averaged and Standard-deviation Imagesmentioning

confidence: 52%

Section: Nomenclaturementioning

confidence: 99%

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

Gruber¹,

Carter²,

Montes³

et al. 2008

Journal of Propulsion and Power

View full text Add to dashboard Cite

show abstract

“…As noted above our investigation of gaseous fuel injectors has ranged from the study of simple circular wall injectors to the study of more complicated approaches, such as the use of pylon-based injectors [8,20], tandem injectors (e.g., the cascade injector [21]), and diamondshaped injectors [32,33,52]. In the case of simple circular injectors, a recent effort has focused on providing a validation data set for modelers; this is discussed below in the section on Multidisciplinary Laser Measurements.…”

Section: Gaseous Fuel Injectionmentioning

confidence: 99%

Supersonic Combustion Ramjet Research

Carter¹

2012

View full text Add to dashboard Cite

“…The presence of these added shockwaves will result in total pressure losses. However Montes (2005) clearly showed increased penetration height over the no-pylon transverse injection method. Whether the increased mixing efficiency offsets any losses from shock formation requires further research.…”

Section: Enhancing the Mixing Processmentioning

confidence: 99%

“…Figure A2. Pylon strut upstream (free stream direction is X-axis) of transverse injection port (Montes, 2005; used without permission).…”

Section: Enhancing the Mixing Processmentioning

confidence: 99%

Performance Measurements of Direct Air Injection in a Cavity-Based Flameholder for a Supersonic Combustor

Edens¹

2006

42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

Self Cite

View full text Add to dashboard Cite

For several years the Air Force Research Lab Propulsion Directorate has been studying the difficulties in fueling supersonic combustion ramjet engines with hydrocarbon based fuels. Recent investigations have focused on the use of direct air injection into a directlyfueled cavity-based flameholder. Direct air injection has been shown qualitatively to be a valuable tool for improving cavity combustion. Little quantitative data is available that characterizes the performance of cavity-based flameholders. The objective of this research was to quantitatively determine the specific advantages and disadvantages of the direct air injection scheme. This was accomplished via intrusive probing into a supersonic free stream flow at an axial location behind the cavity flameholder. Pitot and static pressure, total temperature, and gas sampling measurements were taken and the corresponding values were processed to yield relevant engineering quantities. Data were taken over a range of fuel and air injection rates. Direct air injection resulted in increased combustion throughout the area of interest behind the cavity. Air injection increased the static temperature and pressure throughout the area of interest. Enthalpy spread into the free stream was also increased through the use of air injection. Total pressure losses increased as a result of the direct air injection scheme. The ratio of enthalpy increase to increase in total pressure losses increased with higher fuel flow rates, indicating that the direct air injection technique shows more promise for higher fuel loadings.iv

show abstract

Mixing Effects of Pylon-Aided Fuel Injection Located Upstream of a Flameholding Cavity in Supersonic Flow

Cited by 15 publications

References 16 publications

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

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

Supersonic Combustion Ramjet Research

Performance Measurements of Direct Air Injection in a Cavity-Based Flameholder for a Supersonic Combustor

Contact Info

Product

Resources

About