Infuluences of Fuel Nozzle Shape on the Soot Emission and the Flow Field of Diffusion Flames

2017 ◽  
Vol 2017 (0) ◽  
pp. G0500202
Author(s):  
Naofumi KASAYA ◽  
Mamoru KIKUCHI ◽  
Yosuke SUENAGA ◽  
Hideki YANAOKA
Keyword(s):  
Flow Field ◽  
Diffusion Flames ◽  
Soot Emission ◽  
Fuel Nozzle ◽  
Nozzle Shape

Influences of Fuel Nozzle Shape on the Soot Emission of Diffusion Flames

2016 ◽  
Vol 2016 (0) ◽  
pp. G0600103
Author(s):  
Naofumi KASAYA ◽  
Mamoru KIKUCHI ◽  
Yosuke SUENAGA ◽  
Hideki YANAOKA
Keyword(s):  
Diffusion Flames ◽  
Soot Emission ◽  
Fuel Nozzle ◽  
Nozzle Shape

Effect of Diluent on the Blowout Limits of Jet Diffusion Flames

2001 ◽  
Author(s):  
N. Papanikolaou ◽  
I. Wierzba ◽  
V. W. Liu
Keyword(s):  
Carbon Dioxide ◽  
Experimental Investigation ◽  
Flow Field ◽  
Diffusion Flames ◽  
Jet Fuel ◽  
Field Structure ◽  
Jet Diffusion Flames ◽  
Air Stream ◽  
Lifted Flames

Abstract The paper will describe the results of an experimental investigation on the effect of diluents premixed with either the jet or co-flowing air stream on the blowout limits and flow field structure of jet diffusion flames. Experiments were conducted for a range of co-flowing air stream velocities with methane as the primary jet fuel, and nitrogen and carbon dioxide as diluents in the jet fuel; carbon dioxide was also used in the co-flowing air stream. The addition of a diluent to the surrounding air stream had a much stronger effect on the blowout limits than the addition of the diluent to the jet fuel. The effect of partially premixing air with the jet fuel on the blowout limits was also investigated. The addition of air (to up to 30%) to the methane jet significantly reduced the blowout limits of lifted flames, but it had little effect on the blowout limits of attached flames, which was rather unexpected.

PAHs and Soot Emissions in Oxygenated Ethylene Diffusion Flames at Elevated Pressures

2018 ◽  
Author(s):  
Krishna C. Kalvakala ◽  
Suresh K. Aggarwal
Keyword(s):  
Diffusion Flames ◽  
Soot Formation ◽  
Computational Study ◽  
Mixture Fraction ◽  
Flame Temperature ◽  
Primary Objective ◽  
Soot Emission ◽  
Elevated Pressures ◽  
Polycyclic Aromatic ◽  
Soot Emissions

Operating combustion systems at elevated pressures has the advantage of improved thermal efficiency and system compactness. However, it also leads to increased soot emission. We report herein a computational study to characterize the effect of oxygenation on PAHs (Polycyclic Aromatic Hydrocarbons) and soot emissions in ethylene diffusion flames at pressures 1–8atm. Laminar oxygenated flames are established in a counterflow configuration by using N2 diluted fuel stream along with O2 enriched oxidizer stream such that the stoichiometric mixture fraction (ζst) is varied, but the adiabatic flame temperature is not materially changed. Simulations are performed using a validated fuel chemistry model and a detailed soot model. The primary objective of the study was to expand the fundamental understanding of PAH and soot formation in oxygenated flames at elevated pressures. At a given pressure, as the level of oxygenation (ζst) is increased, we observe a significant reduction in PAHs (benzene and pyrene) and consequently in soot formation. Further, at a fixed ζst, as pressure is increased, it leads to increased benzene and pyrene formation, and thus increased soot emission. The reaction path analysis indicates that this can be attributed to the fact that at higher pressures, the C2/C4 path becomes more significant for benzene formation compared to the propargyl recombination path.

scholarly journals Buoyant Tsuji diffusion flames: global flame structure and flow field

2020 ◽  
Vol 895 ◽  
Author(s):  
Mariovane S. Donini ◽  
Cesar F. Cristaldo ◽  
Fernando F. Fachini
Keyword(s):  
Flow Field ◽  
Diffusion Flames ◽  
Flame Structure ◽  
Image Position

Structure of Swirl Chamber of Turbulent Combustion Diesel Engine

2013 ◽  
Vol 448-453 ◽  
pp. 3408-3412
Author(s):  
Wen Hua Yuan ◽  
Yi Ma ◽  
Wu Qiang Long ◽  
Jun Fu ◽  
Yu Mei Liu
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Turbulent Combustion ◽  
Fuel Injection ◽  
Spherical Shape ◽  
Temperature Characteristic ◽  
Time Range ◽  
Swirl Chamber ◽  
Fuel Nozzle ◽  
High Temperature Area

Numerical simulation was conducted on three types of swirl chamber of turbulent combustion diesel engine, i.e. cone-shaped flat-bottomed, cylindrical flat-bottomed and spherical shape. The characteristics of flow field in cylinder were studied within the time range for the piston to move from BTDC 108°CA to BTDC 8°CA (at the instant of fuel injection), thus analyzed the changes of flow field in swirl chambers of such three different structures prior to fuel injection based on the velocity vector diagram at all times and the final temperature characteristic diagram of the flow field. The results show that: in the process of piston motion, an organized fierce vortex can be developed inside the swirl chamber, while in the vicinity of fuel nozzle, the air flow rate is 111.14m/s, 83.01m/s or 175.76m/s and the air temperature is 1384.15K, 1337.38K or 1350.46K respectively. A small fluid stagnation zone will be formed in the lower right end of the cone-shaped flat-bottomed swirl chamber or the cylindrical flat-bottomed swirl chamber and is adverse to the mixing of fuel and air. In comparison with the swirl chambers of other two structures, the smaller temperature gradient of fluid and the larger high-temperature area in the cylindrical swirl chamber are beneficial to the mixing of injected fuel and air.

Numerical Simulation of Pulse Cleaning Process in Ceramic Filtration System

2013 ◽  
Vol 726-731 ◽  
pp. 2220-2223
Author(s):  
Hai Xia Li ◽  
Wei Jiang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Simulation Model ◽  
Field Distribution ◽  
Pressure Variation ◽  
Lower Pressure ◽  
Cleaning Process ◽  
Filtration System ◽  
Nozzle Shape ◽  
Ceramic Filtration

The numerical simulation model was established using FLUENT code to analysis the flow field of pulse cleaning process of filtration system. The pressure variation with pulse cleaning time was studied. The effect of nozzle shape and diffuser shape on flow field was investigated. The diffuser construct can affect the flow field distribution, but the effect is little. The converged nozzle can bring better pulse cleaning effect by bring higher velocity and lower pressure at outlet.

Experimental investigation of the effect of nozzle shape and test section perforation on the stationary and non-stationary characteristics of flow field in the large transonic TsAGI T-128 Wind tunnel

2005 ◽  
Vol 109 (1092) ◽  
pp. 75-82 ◽  
Author(s):  
V. I. Biryukov ◽  
S. A. Glazkov ◽  
A. R. Gorbushin ◽  
A. I. Ivanov ◽  
A. V. Semenov
Keyword(s):  
Wind Tunnel ◽  
Flow Field ◽  
Test Section ◽  
Static Pressure ◽  
Pressure Fluctuations ◽  
Flow Characteristics ◽  
Experimental Investigations ◽  
Drive Power ◽  
Static Pressure Distribution ◽  
Nozzle Shape

Abstract The results are presented for a cycle of experimental investigations of flow field characteristics (static pressure distribution, static pressure fluctuations, upwash, boundary-layer parameters) in the perforated test section of the transonic TsAGI T-128 Wind Tunnel. The investigations concern the effect of nozzle shape, wall open-area ratio, Mach and Reynolds numbers on the above-outlined flow characteristics. During the tests, the main Wind-tunnel drive power is measured. Optimal parameters of the nozzle shape and test section perforation are obtained to minimise acoustic perturbations in the test section and their non-uniformity in frequency, static pressure field non-uniformity, nozzle and test section drag and, accordingly, required main Wind-tunnel drive power.

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