Fuel Atomization Effects on Combustor Performance

Rizk, N. K.

doi:10.2514/6.2004-3540

Cited by 5 publications

(7 citation statements)

References 16 publications

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“…The mean drop diameter of fuel drops is known as Sauter mean diameter (SMD) which is defined as the diameter of a drop within the spray whose ratio of volume to surface area is the same as that of the whole spray. In an airblast atomizer, the drop size can be a function of fuel and air properties at operating condition and the dimension of flow passages [6].…”

Section: Atomizer Performancementioning

confidence: 99%

See 1 more Smart Citation

Influence of Fuel Atomization on Combustor Lean Blowout: An Empirical Approach

Mishra,

Kishore Kumar,

Chandel

2023

joast

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Empirical approach has been adopted to study the effect of operating conditions on atomizing parameters and influence of such parameters on lean blowout limit in a gas turbine combustor. Poor atomization represented by higher spray drop size is found to affect adversely the lean blowout limit. Low air pressure and low fuel temperature results in a higher fuel drop size and require more energy for evaporation and combustion initiation which has to come from more fuel or higher FAR thus raising the blowout limit. Empirical relations can predict reasonably when validated and updated with more and more experimental data.

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Section: Atomizer Performancementioning

confidence: 99%

“…The expression for SMD as derived by Rizk [6] and El-Shanawamy and Lefebvre [7], based on their experiments on airblast atomizers at different operating condition is given by,…”

Section: Atomizer Performancementioning

confidence: 99%

Influence of Fuel Atomization on Combustor Lean Blowout: An Empirical Approach

Mishra,

Kishore Kumar,

Chandel

2023

joast

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“…Increasingly stringent regulations on pollutant emissions, such as NO^, COx, and soot, are required to improve combustion efficiency and flame stability with a wide range of operation conditions for kerosene-fueled aeronautical gas turbines [2,3]. Among key parameters likely to fulfill these goals, the injection system is one of those where substantial improvements can still be achieved [4][5][6]. However, lack of mechanism and difficulty in diagnostics of the complex fluid dynamic phenomena including swirling flow aerodynamics, fuel atomization, and fuel-air mixing are obstacles in the design of gas turbine combustors.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Performance of an Air Blast Atomizer by Planar Laser Sheet Imaging Technique

Liu¹,

Liu²,

Mao³

et al. 2013

Journal of Engineering for Gas Turbines and Power

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It is widely recognized that the fuel-air mixing process is a critical factor in improving combustion efficiency and in minimizing pollutants such as NOx. Enhancement of fuel-air mixing can lead to lower pollutant emissions and greater efficiency. However, swirl-ing flows in lean combustors play the role of fuel-air mixing and flame stability. The complex fluid dynamic phenomena encountered in swirling two-phase flow contribute to the difficulty in complete understanding of the different processes occurring in combus-tors. Fortunately, optical and laser-based visualization techniques available in our lab are important nonintrusive tools for visualizing flow process, especially for fuel injection and fuel-air mixing. To provide for a better understanding of effects of counter-rotating flow on droplets in atomization process, this study is a detailed characterization of the spray generated by an airblast atomizer by planar laser sheet imaging method. Optical facility for spray diagnostics with fuel planar laser induced fluorescence (fuel-PLIF) method for fuel distribution and particle image velocimetry (PIV) method for the velocity of droplets is used to evaluate the performance of an airblast atomizer. The results show that the performance of secondary atomization is influenced by swirling flow and pri-mary atomization simultaneously; the swirling flow exhibits significant influence on the droplet size and space distribution relative to that of primary atomization. The primary swirling air reopens the spray cone generated by pressure-swirl atomizer, and the sec-ondary swirling air affects the fuel distribution by forming the recirculation zone. The results provide critical information for the design and development of combustion chambers. [DOI: 10.1115/1.4025235

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“…The combustion efficiency can be improved by controlling these parameters to reduce the emissions of carbon compounds. [2][3][4][5][6] The thickness of the liquid film formed by the spray medium can affect the spray cone angle and the droplet size, while the formation process of the liquid film mainly occurs in the orifice. The geometric dimensions of the orifice will significantly affect atomization process, in which spray medium is extruded by the air core in the orifice and then forms a liquid film near the wall.…”

Section: Introductionmentioning

confidence: 99%

“…The combustion efficiency can be improved by controlling these parameters to reduce the emissions of carbon compounds. 2 – 6 …”

Section: Introductionmentioning

confidence: 99%

Influence of orifice geometry on atomization characteristics of pressure swirl atomizer

et al. 2020

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The spray characteristics of the pressure swirl nozzle are experimentally studied using particle dynamics analysis (PDA) and high-speed photography system in this paper, specifically focusing on the dependence of geometrical dimensions of orifice on the spray SMD, velocity magnitude and droplet distribution, and the spray cone angle. It is indicated that the increase of orifice diameter makes the initial swirling velocity lower and the spray liquid film thicker. When the spray cone is fully expanded, the flow rate of 900 μm orifice diameter nozzle increases by 30–40% and the SMD of 900 μm orifice diameter nozzle increases by 8.5% compared with that of 700 μm orifice diameter nozzle. According to the experimental conditions, the relationship between Re and spray angle was calculated as θ = 29.97*Re0.087, ignoring the factors that had little influence on spray angle. The decrease of the orifice length makes the distance of gas-medium shearing action shorten so that thinner oil film near wall cannot be formed by the extrusion of air core, leading to the swirling intensity reducing and the suction effect weakened. The spray cone angle of the 450 μm orifice length atomizer is about 5° smaller than the nozzle of 500 μm orifice length, and more small SMD droplets are not sucked, resulting in the distribution range of spray SMD declining.

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Fuel Atomization Effects on Combustor Performance

Cited by 5 publications

References 16 publications

Influence of Fuel Atomization on Combustor Lean Blowout: An Empirical Approach

Influence of Fuel Atomization on Combustor Lean Blowout: An Empirical Approach

Experimental Investigation of Performance of an Air Blast Atomizer by Planar Laser Sheet Imaging Technique

Influence of orifice geometry on atomization characteristics of pressure swirl atomizer

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