Swirl Flows in Combustion: A Review

Lilley, David G.

doi:10.2514/3.60756

Cited by 374 publications

(120 citation statements)

References 57 publications

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“…The method of swirl generation may also alter the critical value at which a CRZ appears, as discussed in [16]. Lilley [6] states that recirculation zones produced by swirl generators are generally much smaller than those produced by swirl vanes. Because of the strong dependence of the flow swirl number on the combustor geometry for similar designs, a precautionary critical value of 0.4 is considered in the following for designs like that shown in Fig.…”

Section: Design and Operating Parameters Of Swirling-flow Combustorsmentioning

confidence: 99%

“…Axial velocity profiles are usually Gaussian-shaped for very low swirl number [14,15]. With the increase of the swirl number, axial velocity maxima are displaced from the jet axis, resulting in a double hump-shaped velocity profile [1,6]. Transition from a Gaussian to a double hump-shape is affected by the method used to generate swirl [12,16] and by the Dh/D ratio [14,15].…”

Section: Design and Operating Parameters Of Swirling-flow Combustorsmentioning

confidence: 99%

“…Introduction of swirl on turbulent jets causes an increase in the rate of fluid entrainment and velocity decay [1,6,13]. Axial velocity profiles are usually Gaussian-shaped for very low swirl number [14,15].…”

Section: Design and Operating Parameters Of Swirling-flow Combustorsmentioning

confidence: 99%

“…An extensive review of high-swirling reacting flows and their application within combustion systems was performed by Syred and Beer [4] and Syred [5]. An early state-of-the-art of the experimental findings on swirling reacting flows and their modelling is provided in [6]. In [7] the authors analyse the types of vortex breakdown (which precedes the CRZ formation) and present the effect of inlet conditions and geometry on the structures of recirculation zones.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Reynolds number and the basic design parameters on the isothermal flow field of low-swirl combustors

Gobbato

Masi

Cappelletti

et al. 2017

Experimental Thermal and Fluid Science

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Swirling flows through sudden expansions is a common solution adopted to stabilise the flame within combustion systems. Fuel-air mixing promoted by the swirling motion contributes also to complete the fuel oxidation and reduce pollutant emissions. (http://www.sciencedirect.com/science/article/pii/S0894177717300304) 2 extended considering original measurements performed by the authors on a laboratory combustor.The comparison shows that the flow field of low-swirl combustors is mainly affected by the Reynolds number. Among the design parameters considered, the expansion ratio is the most significant. In particular, the former controls the radial position of the velocity peak whereas the latter influences the axial decay of velocity within the jet core.

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Section: Design and Operating Parameters Of Swirling-flow Combustorsmentioning

confidence: 99%

Section: Design and Operating Parameters Of Swirling-flow Combustorsmentioning

confidence: 99%

Section: Design and Operating Parameters Of Swirling-flow Combustorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of the Reynolds number and the basic design parameters on the isothermal flow field of low-swirl combustors

Gobbato

Masi

Cappelletti

et al. 2017

Experimental Thermal and Fluid Science

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“…Axial and tangential velocity profiles, if not measured, were often assumed to be simple flat, linear or parabolic profiles. Such approaches eliminate the need to model the inlet systems directly, but produce unreliable predictions ( Sloan et al, 1986;Dong and Lilley, 1994) The first studies on combustion in swirling flow were reviewed by Syred and Beér, 1974;Lilley, 1977;Gupta et al, 1984 and others. More recently, papers by Vanoverberghe et al, 2003 andMondal et al, 2004 included an extensive reference list with the most recent works on the subject.…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation of the aerodynamics of a furnace with a movable block burner

Fudihara

Goldstein

Mori

2007

Braz. J. Chem. Eng.

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-In this work the air flow in a furnace was computationally investigated. The furnace, for which experimental test data are available, is composed of a movable block burner connected to a cylindrical combustion chamber by a conical quarl. The apertures between the movable and the fixed blocks of the burner determine the ratio of the tangential to the radial air streams supplied to the furnace. Three different positions of the movable blocks were studied at this time. A three-dimensional investigation was performed by means of the finite volume method. The numerical grid was developed by the multiblock technique. The turbulence phenomenon was addressed by the RNG k-ε model. Profiles of the axial, tangential and radial velocities in the combustion chamber were outlined. The map of the predicted axial velocity in the combustion chamber was compared with a map of the experimental axial velocity. The internal space of the furnace was found to be partially filled with a reverse flow that extended around the longitudinal axis. A swirl number profile along the furnace length is presented and shows an unexpected increase in the swirl in the combustion chamber.

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