An Experimental study on spray and atomization characteristics of advanced co-optima biofuels

2022 ◽  
Author(s):  
Sheikh Salauddin ◽  
Kareem A. Ahmed
Keyword(s):  
Experimental Study ◽  
Atomization Characteristics

Experimental Study on the Role of Entropy Waves in Low-Frequency Oscillations for a Diffusion Burner

2004 ◽  
Author(s):  
J. Eckstein ◽  
E. Freitag ◽  
C. Hirsch ◽  
T. Sattelmayer
Keyword(s):  
Experimental Study ◽  
Low Frequency ◽  
Feedback Mechanism ◽  
Mean Flow ◽  
Primary Zone ◽  
Start Up ◽  
Atomization Characteristics ◽  
Aero Engines ◽  
The Impact

“Rumble” is a self-excited combustion instability, usually occurring at the start-up of aero-engines with fuel-spray atomizers at sub-idle and idle conditions, and exhibiting low limit frequencies in the range of 50 Hz to 150 Hz. Entropy waves at the (nearly) choked combustor outlet are supposed to be the key feedback-mechanism for the observed self-excited pressure oscillations. The experimental study presented here aims to clarify the role of the entropy waves for the occurrence of rumble. A generic air-blast atomizer with a design being prone to self-excitation has been incorporated into a thermoacoustic combustor test rig with variable outlet conditions. The flame thermoacoustics were characterized by recording the OH*-chemiluminescence, the dynamic pressures, the dynamic temperatures, and by applying PIV. The measurements have shown the occurrence of periodic hot spots travelling with the mean flow with considerable dispersion. Measurements have been conducted with an open-ended resonance tube in order to eliminate the impact of entropy waves on the mechanism of self-excitation. The oscillation obtained, comparable in amplitude and frequency, proved that self-excitation primarily depends on convective time delays of the droplets in the primary zone and thus on the atomization characteristics of the nozzle.

K-2014 Experimental Study for Atomization Characteristics of DME blended Plant Oil

2001 ◽  
Vol II.01.1 (0) ◽  
pp. 515-516
Author(s):  
Ryoji EHARA ◽  
Takeshi HIROSE ◽  
Insu KIM ◽  
Mitsuharu OGUMA ◽  
Mahabubul ALAM ◽  
...  
Keyword(s):  
Experimental Study ◽  
Plant Oil ◽  
Atomization Characteristics

Experimental Study on the Role of Entropy Waves in Low-Frequency Oscillations in a RQL Combustor

2004 ◽  
Vol 128 (2) ◽  
pp. 264-270 ◽  
Author(s):  
J. Eckstein ◽  
E. Freitag ◽  
C. Hirsch ◽  
T. Sattelmayer
Keyword(s):  
Experimental Study ◽  
Low Frequency ◽  
Feedback Mechanism ◽  
Mean Flow ◽  
Primary Zone ◽  
Start Up ◽  
Atomization Characteristics ◽  
Aero Engines ◽  
The Impact

“Rumble” is a self-excited combustion instability, usually occurring at the start-up of aero-engines with fuel-spray atomizers at sub-idle and idle conditions, and exhibiting low limit frequencies in the range of 50Hzto150Hz. Entropy waves at the (nearly) choked combustor outlet are supposed to be the key feedback mechanism for the observed self-excited pressure oscillations. The experimental study presented here aims at clarifying the role of entropy waves in the occurrence of rumble. A generic air-blast atomizer with a design prone to self-excitation has been incorporated into a thermoacoustic combustor test rig with variable outlet conditions. The thermoacoustic response of the flame was characterized by recording the OH* chemiluminescence, the dynamic pressures, the dynamic temperatures, and by applying PIV. The measurements have shown the occurrence of periodic hot spots traveling with the mean flow with considerable dispersion. Measurements have been conducted with an open-ended resonance tube in order to eliminate the impact of entropy waves on the mechanism of self-excitation. The oscillation obtained, comparable in amplitude and frequency, proved that self-excitation primarily depends on convective time delays of the droplets in the primary zone and thus on the atomization characteristics of the nozzle.

scholarly journals Experimental Study on Atomization Characteristics of Gas–Liquid Two-Phase Flow Nozzle and Its Dust Removal Effect

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 565
Author(s):  
Xueming Fang ◽  
Bingyou Jiang ◽  
Liang Yuan ◽  
Yuxiang Liang ◽  
Bo Ren ◽  
...  
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Two Phase Flow ◽  
Respirable Dust ◽  
Phase Flow ◽  
Capture Effect ◽  
Two Phase ◽  
Ambient Humidity ◽  
Working Surface ◽  
Atomization Characteristics

An experimental study on the flow rate and atomization characteristics of a new gas–liquid two-phase flow nozzle was carried out to use high-concentration respirable dust in the workplace of high-efficiency sedimentation coal production based on the gas–liquid two-phase flow nozzle technology. The simulation roadway of dust fall in large coal mines was constructed, and the respirable rock dust produced by fully mechanized mining surfaces was chosen as the research object. The effects of humidity on the capture effect of respirable rock dust were analyzed in the experimental study. The results demonstrated that: (1) the distribution range of the particle size of fogdrops declines with the reduction in fogdrops D50, D[3,2] and D[4,3], which are produced by gas–liquid two-phase flow nozzles. (2) The initial ambient humidity in the simulated roadway was 64.8% RH. After the gas–liquid two-phase flow spray was started, the ambient humidity was elevated by 23.2 to 23.5% RH within 840s and tended to be stable and no longer grew after reaching 88.0–88.3% RH. The initial growth rate of the ambient humidity in the simulated roadway was high, and then was gradually slowed down. (3) Humidity is an important factor influencing the collection of respirable dust. The humidity at 10.0 m leeward of the dust-producing point was increased by 19.6% RH, and the sedimentation rate of respirable dust was increased by 6.73%; the two growth rates were 13.1% RH and 9.90% at 20.0 m; 16.4% RH and 15.42% at 30.0 m; 18.4% RH and 11.20% at 40.0 m. In practical applications of the gas–liquid two-phase flow nozzle in coal mining activities, attention shall be paid to not only the influences of its atomization characteristics on the capture effect of respirable dust but also the influences of the flow rate of the nozzle on the humidity of the working surface. Appropriate gas and water supply pressures shall be chosen according to the space and respirable dust concentration on the working surface to realize a better dust removal effect.

An experimental study on the atomization characteristics of impinging jets of power law fluid

2015 ◽  
Vol 217 ◽  
pp. 49-57 ◽  
Author(s):  
Yong-cui Ma ◽  
Fu-qiang Bai ◽  
Qing Chang ◽  
Ji-ming Yi ◽  
Kui Jiao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Power Law ◽  
Impinging Jets ◽  
Power Law Fluid ◽  
Atomization Characteristics
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