The Applicability of Jet-Shear-Layer Mixing and Effervescent Atomization for Low-NOx Combustors

Colantonio, Renato O.

doi:10.1115/1.2818073

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…The disintegration of pure liquids may be enhanced using perforated plates in front of the discharge orifice. The application of the so-called ligament-control inserts has been studied by Kuta et al and Sutherland et al Atomizers with annular discharge orifices ,, or multihole atomizers ,,, may have a slightly different design and other more complicated and sophisticated designs may appear in the future, as, for example, in the case of combined atomizers…”

Section: Introductionmentioning

confidence: 99%

Development of an Effervescent Atomizer for Industrial Burners

Jedelský¹,

Jícha²,

Slama³

et al. 2009

Energy Fuels

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The present work is conducted with the purpose of developing an effervescent atomizer for industrial burners that will generate a fine and steady spray in large turn-down ratio. The atomizer is fed with light heating oil (LHO) and uses air as an atomizing medium. First, a basic classification is made of the published design concepts of effervescent atomizers investigated by different researchers. Three distinct types of such atomizers are recognized. A single-hole, plain-orifice atomizer with an "outside-in" gas injection configuration was chosen for this study. The basic geometric parameters that may significantly influence atomizer performance are described. An experimental study of the effervescent atomizer was conducted to evaluate the influence of operational conditions and that of several geometric parameters on the drop size in the spray. The Sauter mean diameter of drops was measured using a phase/Doppler particle analyzer. The study covers the size and number of aerator holes, their location, and the diameter of the mixing chamber. The influence of these parameters on the spray quality was evaluated at atomizing pressures of 0.1, 0.3, and 0.5 MPa and gas:liquid mass flow rate ratio (GLR) values of 2%, 5%, and 10%. The main goal of this work is to develop a new procedure for the design of effervescent atomizers. This procedure is based on our experimental results and it is also supported by the findings of other authors. It allows for the determination of the key geometric parameters of the atomizer to achieve sprays of minimum mean drop size for defined values of liquid flow rate, air supply pressure, and GLR. The article also studies the optimization of the exit orifice size and of other parameters, such as the size of the mixing chamber (internal diameter and length), and the number, size, and position of aeration holes.

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Section: Introductionmentioning

confidence: 99%

Development of an Effervescent Atomizer for Industrial Burners

Jedelský¹,

Jícha²,

Slama³

et al. 2009

Energy Fuels

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Experiments on atomization and spray characteristics of an effervescent strut injector

2021

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The atomization and the spray characteristics from an effervescent/aerated strut injector were studied experimentally using water as the liquid and nitrogen gas as the secondary fluid. The spray flow features were obtained through various experimental tools such as instantaneous Mie scattering technique, phase Doppler particle analyzer, and time-resolved shadowgraph images for different Weber numbers, momentum flux ratios, and gas to liquid ratios. A proper orthogonal decomposition method was used for an in-depth analysis of the spray structures. The instantaneous Mie scattering images showed the formation of the liquid clusters and the dominant two-phase flow interaction with increasing momentum flux and gas to liquid ratios in addition to the increased spray spread area. The statistical analysis of the Mie images revealed high fluctuating locations in the spray. It was observed that by increasing the momentum flux or gas to liquid ratios, the droplet diameter rapidly decreases due to the flow transition to the annular flow regime. Beyond a certain limit of momentum flux or gas to liquid ratios, no significant change in the diameter was observed. Furthermore, the spatio-temporal fluid dynamic features and the two-phase flow transition inside the spray region were brought out through the proper orthogonal decomposition. The power spectral density revealed the ligament breakup and the droplet formation below ≤500 Hz. Regardless of the momentum flux and gas to liquid ratios, a peak was observed between 2500 Hz and 3000 Hz due to the flow transition where the liquid fragment cluster formation and the flapping were found to be almost constant.

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Characteristics of Spray Particles by Proportional Control Nozzles.

Nishida¹,

Mahmood²,

Asano³

et al. 2002

Journal of the JIME

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Nozzles for industrial boiler applications are of various kinds, which, commonly used, are proportional control nozzles and a combination of oil-pressurized nozzles. The proportional control nozzle is used to control the output without changing the primary pump pressure. On the other hand, the oil-pressurized nozzle is the nozzle whose flow is controlled by the oil pressure and an on/off control. The proportional control nozzle, also called•gReturn Nozzle•h, consists of a main line and a bypass line for linear adjustment of the fuel flow. According to the results of respective exhaust gas measurement of one proportional control nozzle and two oil-pressurized nozzles in a practical boiler, NOx concentration of the proportional control nozzle is 20% lower than the oilpressurized nozzles.

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The Applicability of Jet-Shear-Layer Mixing and Effervescent Atomization for Low-NOx Combustors

Cited by 3 publications

References 7 publications

Development of an Effervescent Atomizer for Industrial Burners

Development of an Effervescent Atomizer for Industrial Burners

Experiments on atomization and spray characteristics of an effervescent strut injector

Characteristics of Spray Particles by Proportional Control Nozzles.

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