Spray group combustion

Chiu, Hua-Hsien; Ahluwalia, Rohini; Croke, E.

doi:10.2514/6.1978-75

Cited by 6 publications

(2 citation statements)

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“…It would be much easier to reduce the emissions to acceptable levels once the combustion system is optimised [8,40,67]. For example, [78,[110][111][112], stated that emissions of NOx and particulate matter could be managed using low NOx burners or other similar methods by applying staged combustion. However, more advanced combustion techniques, such as flameless combustion or exhaust gas recirculation (EGR) or even low-temperature combustion, have yet to be used to allow the use of bio-oil pyrolysis in combustion [113,114].…”

Section: Research Challenges and Conclusionmentioning

confidence: 99%

Effects of Pyrolysis Bio-Oils on Fuel Atomisation—A Review

Panchasara

Ashwath

2021

Energies

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Bio-oils produced by biomass pyrolysis are substantially different from those produced by petroleum-based fuels and biodiesel. However, they could serve as valuable alternatives to fossil fuels to achieve carbon neutral future. The literature review indicates that the current use of bio-oils in gas turbines and compression-ignition (diesel) engines is limited due to problems associated with atomisation and combustion. The review also identifies the progress made in pyrolysis bio-oil spray combustion via standardisation of fuel properties, optimising atomisation and combustion, and understanding long-term reliability of engines. The key strategies that need to be adapted to efficiently atomise and combust bio-oils include, efficient atomisation techniques such as twin fluid atomisation, pressure atomisation and more advanced and novel effervescent atomisation, fuel and air preheating, flame stabilization using swrilers, and filtering the solid content from the pyrolysis oils. Once these strategies are implemented, bio-oils can enhance combustion efficiency and reduce greenhouse gas (GHG) emission. Overall, this study clearly indicates that pyrolysis bio-oils have the ability to substitute fossil fuels, but fuel injection problems need to be tackled in order to insure proper atomisation and combustion of the fuel.

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Section: Research Challenges and Conclusionmentioning

confidence: 99%

Effects of Pyrolysis Bio-Oils on Fuel Atomisation—A Review

Panchasara

Ashwath

2021

Energies

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“…Thus, as noted by Sichel & Palaniswamy (1984), the parameter e is exactly equal to the inverse of the square of the Thiele modulus V employed by Labowsky & Rosner (1978). Also, under the condition of small droplet Reynolds number used in deriving (2.3), e becomes equal to the reciprocal of the group combustion number G introduced by Chiu and co-workers (Chiu & Liu 1977;Chiu et al 1978) times the Lewis number. In many practical applications, the parameter e takes on small values, causing vaporization to occur in a sheath or vaporization front that separates the spray, in saturated equilibrium, from the surrounding droplet-free hot gas, with the flame standing outside the spray in combustion configurations.…”

Section: Pjmentioning

confidence: 99%

Sheath vaporization of a monodisperse fuel-spray jet

Arrieta

Sánchez

Liñán³

et al. 2011

J. Fluid Mech.

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The group vaporization of a monodisperse fuel-spray jet discharging into a hot coflowing gaseous stream is investigated for steady flow by numerical and asymptotic methods with a two-continua formulation used for the description of the gas and liquid phases. The jet is assumed to be slender and laminar, as occurs when the Reynolds number is moderately large, so that the boundary-layer form of the conservation equations can be employed in the analysis. Two dimensionless parameters are found to control the flow structure, namely the spray dilution parameter 1, defined as the mass of liquid fuel per unit mass of gas in the spray stream, and the group vaporization parameter e, defined as the ratio of the characteristic time of spray evolution due to droplet vaporization to the characteristic diffusion time across the jet. It is observed that, for the small values of e often encountered in applications, vaporization occurs only in a thin layer separating the spray from the outer droplet-free stream. This regime of sheath vaporization, which is controlled by heat conduction, is amenable to a simplified asymptotic description, independent of e, in which the location of the vaporization layer is determined numerically as a free boundary in a parabolic problem involving matching of the separate solutions in the external streams, with appropriate jump conditions obtained from analysis of the quasi-steady vaporization front. Separate consideration of dilute and dense sprays, corresponding, respectively, to the asymptotic limits 1<€ 1 and A > 1, enables simplified descriptions to be obtained for the different flow variables, including explicit analytic expressions for the spray penetration distance.

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