The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Jason C. Doster - One of the best experts on this subject based on the ideXlab platform.
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In-Stream Hypermixer Fueling Pylons in Supersonic Flow
Journal of Propulsion and Power, 2009Co-Authors: Jason C. Doster, Paul I. King, Mark Gruber, Campbell D. Carter, Michael D. Ryan, Kuang-yu HsuAbstract:This paper presents results from both computational fluid dynamic and wind-tunnel experiments of in-stream fueling Pylons injecting air, ethylene, and methane gas into Mach number 2.0 cold airflow. Three fuel-injection Pylons studied include a basic Pylon, a ramp Pylon, and an alternating-wedge Pylon. The latter two Pylons introduce streamwise vorticity into the flow to increase mixing action. The computational fluid dynamic solution was accomplished using the commercial code FLUENT®. Three wind-tunnel experimental techniques were used: aerothermal probing, Raman spectroscopy, and nitric-oxide planar laser-induced fluorescence. Four measures reported include streamwise vorticity, total-pressure-loss, mixing efficiency, and flammable plume extent. The ramp and alternating-wedge Pylons show decisive increases in mixing capability compared with the basic Pylon for a finite distance downstream of the injector. The alternating-wedge Pylon exhibits a measurable increase in total pressure loss compared with the basic Pylon, and the ramp Pylon exhibits a negligible increase in total pressure loss compared with the basic Pylon. For comparison, the downstream mixing effectiveness of the three Pylons is compared with the downstream mixing effectiveness of a transverse circular wall injector studied in past research. In addition, a qualitative comparison between the computational fluid dynamic and wind-tunnel experimental results is made.
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Experimental Investigation of Air and Methane Injection from In-stream Fueling Pylons
44th AIAA ASME SAE ASEE Joint Propulsion Conference & Exhibit, 2008Co-Authors: Jason C. Doster, Paul I. King, Mark Gruber, Campbell D. Carter, Michael D. Ryan, Kuang-yu HsuAbstract:This paper covers experimental results for in-stream fuel injectors in a Mach number 1.95 air∞ow. Three fuel injection Pylon conflgurations studied include a basic Pylon, a ramp Pylon, and an alternating wedge Pylon. The flrst Pylon is a baseline conflguration. The latter two introduce streamwise vorticity into the ∞ow to increase mixing action via their trailing edge geometries. A cold ∞ow study with fuel injection is accomplished to compare the three Pylons mixing capabilities and pressure losses. Three experimental techniques are used: aerothermal probing, Raman spectroscopy, and nitric-oxide planar laser induced ∞uorescence (NO-PLIF). Aerothermal probing and NO-PLIF are accomplished with air injection from the Pylons, while Raman spectroscopy is accomplished with methane injection. The ramp and alternating wedge Pylons show decisive increases in mixing capability compared with the basic Pylon. They also exhibit a slight increase in total pressure loss compared with the basic Pylon.
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EXPERIMENTAL INVESTIGATION OF AIR AND METHANE INJECTION FROM IN-STREAM FUELING PylonS (POSTPRINT)
2008Co-Authors: Jason C. Doster, Paul I. King, Mark Gruber, Campbell D. Carter, Michael D. Ryan, Kuang-yu HsuAbstract:Abstract : This paper covers experimental results for in-stream fuel injectors in a Mach number 1.95 airflow. Three fuel injection Pylon configurations studied include a basic Pylon, a ramp Pylon, and an alternating wedge Pylon. The first Pylon is a baseline configuration. The latter two introduce streamwise vorticity into the flow to increase mixing action via their trailing edge geometries. A cold flow study with fuel injection is accomplished to compare the three Pylons mixing capabilities and pressure losses. Three experimental techniques are used: aerothermal probing, Raman spectroscopy, and nitric-oxide planar laser induced fluorescence (NO-PLIF). Aerothermal probing and NO-PLIF are accomplished with air injection from the Pylons, while Raman spectroscopy is accomplished with methane injection. The ramp and alternating wedge Pylons show decisive increases in mixing capability compared with the basic Pylon. They also exhibit a slight increase in total pressure loss compared with the basic Pylon.
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Numerical Simulation of Ethylene Injection from In-stream Fueling Pylons
15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2008Co-Authors: Jason C. Doster, Paul I. King, Mark Gruber, Raymond C. MapleAbstract:This paper covers numerical simulation results for an in-stream fuel injector in a Mach number 2.0 ∞ow. Three fuel injection Pylon conflgurations studied are a basic Pylon, a ramp Pylon, and an alternating wedge Pylon. The flrst Pylon conflguration is a baseline. The latter two conflgurations introduce streamwise vorticity into the ∞ow to increase mixing action. Computational Fluid Dynamic simulations with ethylene fuel injection are presented and evaluated. Four parameters used for comparison among the Pylons are streamwise vorticity, total pressure loss, mixing e‐ciency, and ∞ammable plume extent. An overall energy comparison is also accomplished. It is found the two Pylons with streamwise vorticity generation are better mixing devices that have an energy advantage over the baseline for a flnite distance downstream of the Pylon.
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NUMERICAL SIMULATION OF ETHYLENE INJECTION FROM IN-STREAM FUELING PylonS (POSTPRINT)
2008Co-Authors: Jason C. Doster, Paul I. King, Raymond C. Maple, Mark GruberAbstract:Abstract : This paper covers numerical simulation results for an in-stream fuel injector in a Mach number 2.0 flow. Three fuel injection Pylon configurations studied are a basic Pylon, a ramp Pylon, and an alternating wedge Pylon. The first Pylon configuration is a baseline. The latter two configurations introduce streamwise vorticity into the flow to increase mixing action. Computational Fluid Dynamic simulations with ethylene fuel injection are presented and evaluated. Four parameters used for comparison among the Pylons are streamwise vorticity, total pressure loss, mixing efficiency, and flammable plume extent. An overall energy comparison is also accomplished. It is found the two Pylons with streamwise vorticity generation are better mixing devices that have an energy advantage over the baseline for a finite distance downstream of the Pylon.
Mark Gruber - One of the best experts on this subject based on the ideXlab platform.
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In-Stream Hypermixer Fueling Pylons in Supersonic Flow
Journal of Propulsion and Power, 2009Co-Authors: Jason C. Doster, Paul I. King, Mark Gruber, Campbell D. Carter, Michael D. Ryan, Kuang-yu HsuAbstract:This paper presents results from both computational fluid dynamic and wind-tunnel experiments of in-stream fueling Pylons injecting air, ethylene, and methane gas into Mach number 2.0 cold airflow. Three fuel-injection Pylons studied include a basic Pylon, a ramp Pylon, and an alternating-wedge Pylon. The latter two Pylons introduce streamwise vorticity into the flow to increase mixing action. The computational fluid dynamic solution was accomplished using the commercial code FLUENT®. Three wind-tunnel experimental techniques were used: aerothermal probing, Raman spectroscopy, and nitric-oxide planar laser-induced fluorescence. Four measures reported include streamwise vorticity, total-pressure-loss, mixing efficiency, and flammable plume extent. The ramp and alternating-wedge Pylons show decisive increases in mixing capability compared with the basic Pylon for a finite distance downstream of the injector. The alternating-wedge Pylon exhibits a measurable increase in total pressure loss compared with the basic Pylon, and the ramp Pylon exhibits a negligible increase in total pressure loss compared with the basic Pylon. For comparison, the downstream mixing effectiveness of the three Pylons is compared with the downstream mixing effectiveness of a transverse circular wall injector studied in past research. In addition, a qualitative comparison between the computational fluid dynamic and wind-tunnel experimental results is made.
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Experimental Investigation of Air and Methane Injection from In-stream Fueling Pylons
44th AIAA ASME SAE ASEE Joint Propulsion Conference & Exhibit, 2008Co-Authors: Jason C. Doster, Paul I. King, Mark Gruber, Campbell D. Carter, Michael D. Ryan, Kuang-yu HsuAbstract:This paper covers experimental results for in-stream fuel injectors in a Mach number 1.95 air∞ow. Three fuel injection Pylon conflgurations studied include a basic Pylon, a ramp Pylon, and an alternating wedge Pylon. The flrst Pylon is a baseline conflguration. The latter two introduce streamwise vorticity into the ∞ow to increase mixing action via their trailing edge geometries. A cold ∞ow study with fuel injection is accomplished to compare the three Pylons mixing capabilities and pressure losses. Three experimental techniques are used: aerothermal probing, Raman spectroscopy, and nitric-oxide planar laser induced ∞uorescence (NO-PLIF). Aerothermal probing and NO-PLIF are accomplished with air injection from the Pylons, while Raman spectroscopy is accomplished with methane injection. The ramp and alternating wedge Pylons show decisive increases in mixing capability compared with the basic Pylon. They also exhibit a slight increase in total pressure loss compared with the basic Pylon.
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EXPERIMENTAL INVESTIGATION OF AIR AND METHANE INJECTION FROM IN-STREAM FUELING PylonS (POSTPRINT)
2008Co-Authors: Jason C. Doster, Paul I. King, Mark Gruber, Campbell D. Carter, Michael D. Ryan, Kuang-yu HsuAbstract:Abstract : This paper covers experimental results for in-stream fuel injectors in a Mach number 1.95 airflow. Three fuel injection Pylon configurations studied include a basic Pylon, a ramp Pylon, and an alternating wedge Pylon. The first Pylon is a baseline configuration. The latter two introduce streamwise vorticity into the flow to increase mixing action via their trailing edge geometries. A cold flow study with fuel injection is accomplished to compare the three Pylons mixing capabilities and pressure losses. Three experimental techniques are used: aerothermal probing, Raman spectroscopy, and nitric-oxide planar laser induced fluorescence (NO-PLIF). Aerothermal probing and NO-PLIF are accomplished with air injection from the Pylons, while Raman spectroscopy is accomplished with methane injection. The ramp and alternating wedge Pylons show decisive increases in mixing capability compared with the basic Pylon. They also exhibit a slight increase in total pressure loss compared with the basic Pylon.
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Numerical Simulation of Ethylene Injection from In-stream Fueling Pylons
15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2008Co-Authors: Jason C. Doster, Paul I. King, Mark Gruber, Raymond C. MapleAbstract:This paper covers numerical simulation results for an in-stream fuel injector in a Mach number 2.0 ∞ow. Three fuel injection Pylon conflgurations studied are a basic Pylon, a ramp Pylon, and an alternating wedge Pylon. The flrst Pylon conflguration is a baseline. The latter two conflgurations introduce streamwise vorticity into the ∞ow to increase mixing action. Computational Fluid Dynamic simulations with ethylene fuel injection are presented and evaluated. Four parameters used for comparison among the Pylons are streamwise vorticity, total pressure loss, mixing e‐ciency, and ∞ammable plume extent. An overall energy comparison is also accomplished. It is found the two Pylons with streamwise vorticity generation are better mixing devices that have an energy advantage over the baseline for a flnite distance downstream of the Pylon.
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NUMERICAL SIMULATION OF ETHYLENE INJECTION FROM IN-STREAM FUELING PylonS (POSTPRINT)
2008Co-Authors: Jason C. Doster, Paul I. King, Raymond C. Maple, Mark GruberAbstract:Abstract : This paper covers numerical simulation results for an in-stream fuel injector in a Mach number 2.0 flow. Three fuel injection Pylon configurations studied are a basic Pylon, a ramp Pylon, and an alternating wedge Pylon. The first Pylon configuration is a baseline. The latter two configurations introduce streamwise vorticity into the flow to increase mixing action. Computational Fluid Dynamic simulations with ethylene fuel injection are presented and evaluated. Four parameters used for comparison among the Pylons are streamwise vorticity, total pressure loss, mixing efficiency, and flammable plume extent. An overall energy comparison is also accomplished. It is found the two Pylons with streamwise vorticity generation are better mixing devices that have an energy advantage over the baseline for a finite distance downstream of the Pylon.
H Tanaka - One of the best experts on this subject based on the ideXlab platform.
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aerodynamic stability of long span suspension bridges under erection
Journal of Structural Engineering-asce, 2000Co-Authors: H TanakaAbstract:The aerodynamic instability of a long-span suspension bridge with a shallow streamlined box girder is a serious engineering concern, particularly during the early deck erection stage. Its characteristics are significantly influenced by the sequence of deck erection. Using the Hoga Kusten Bridge in Sweden as an example, this paper presents an analytical and experimental discussion regarding the evolution of flutter characteristics for a long-span suspension bridge, and a comparison of different erection sequences and analytical prediction of more stable configurations. The general feature of the flutter limit evolution with the erection program of midspan to Pylons, which was previously evidenced by wind tunnel tests, has been successfully reproduced analytically, and the advantages of keeping nonsymmetric deck configurations were confirmed. The Pylon to midspan program has never been employed for long-span girder bridges, but it was found to be, at least, aerodynamically favorable.
Li Wei-xing - One of the best experts on this subject based on the ideXlab platform.
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Quick Restoration of a Seriously Inclined Pylon in 500 kV Transmission Line
Southern Power System Technology, 2008Co-Authors: Li Wei-xingAbstract:The No.476 Pylon of the 500 kV Hezhou-Luodong line Ⅱ suffered a serious inclination due to the sedimentation of Pylon base.The primary shank was serious bended and some minor slanted struts were ripped apart.Considering the technical and economical aspects,a solution of "rectifying Pylon and restoring power transmission ASAP" is chosen,and with measures of "solidified the Pylon,underlaid the legs of Pylon,replaced the distorted parts and set 4 additional temporary stay wire" the Pylon is restored within 3 days.
Susana Batel - One of the best experts on this subject based on the ideXlab platform.
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explaining public preferences for high voltage Pylon designs an empirical study of perceived fit in a rural landscape
Land Use Policy, 2013Co-Authors: Patrick Devinewright, Susana BatelAbstract:Abstract In many countries, electricity transmission networks are being upgraded and developed arising from policies aiming to decarbonise energy systems. However, new power lines are often controversial, due to their perceived negative impacts on rural landscapes. Despite the fact that visual impacts are an important element of public objections, to date, little research has analysed public preferences for alternative Pylon designs, as well as investigating the social and psychological factors that might explain such preferences. This paper sought to address this gap, informed by research on public acceptance of renewable energy technologies, using a survey conducted with a representative sample of UK adults (n = 1519). The findings indicate that the ‘T-Pylon’ design, winner of a recent competition, was most strongly preferred and the one most perceived to fit with a rural landscape, by comparison to the conventional ‘A frame’ design and a ‘Totem’ design shortlisted in the competition. Linear regression analyses indicated three factors that explained perceived fit, regardless of the designs: lower levels of educational attainment, positive general attitudes towards transmission lines and higher levels of trust in National Grid were associated with positive perceptions of fit of the Pylons in a rural landscape. Finally, findings concerning public support for diverse mitigation measures indicated that the use of alternative designs was less supported than burying new powerlines underground and routing Pylons away from homes and schools. The implications of these results for more sustainable grid networks are discussed.
