Recent advances in the measurement of strongly radiating, turbulent reacting flows

Nathan, Graham J.; Kalt, P.; Alwahabi, Zeyad T.; Dally, Bassam B.; Medwell, Paul R.; Chan, Qing Nian

doi:10.1016/j.pecs.2011.04.001

Cited by 75 publications

(29 citation statements)

References 164 publications

(227 reference statements)

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“…Of these, none report the important Stokes number (Sk 0 ) range of order unity, in which the particle response time is the same order of magnitude as the fluid time scale, but are instead limited to the range of Sk 0 > 9, in which particles exhibit a relatively weak response to turbulent motions. The Stokes number regime of order unity is also particularly relevant in the study of industrial burners as common flow conditions within these burners, shown in table 2, typically result in a Stokes number of order unity (Mullinger & Jenkins 2008;Nathan et al 2012;Smoot & Smith 1985). Furthermore, out of all the previous experiments, only Mostafa et al (1989) employ a truly mono-disperse particle distribution (using a standard deviation in particle size distribution of less than 5%), although Hardalupas et al (1989) and Fleckhaus et al (1987) employ particles with a standard deviation of particle size distribution of less than 15%.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Stokes number on the velocity and concentration distributions in particle-laden jets

2014

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The first measurement of the influence of Stokes number on the distributions of particle concentration and velocity at the exit of a long pipe are reported, together with the subsequent influence on the downstream evolution of these distributions through a particle-laden jet in co-flow. The data were obtained by simultaneous particle image velocimetry and planar nephelometry using four cameras to provide high resolution through the first 30 jet diameters and also correction for optical attenuation. These data provide much more detailed information than is available from previous measurements. From them, new understanding is obtained of how the Stokes number influences the flow at the jet exit plane and how this influence propagates throughout the jet.

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Section: Introductionmentioning

confidence: 99%

“…Specifically, it aims to provide new insight into the role of the Stokes number on the velocity and concentration distributions within a turbulent jet under the three Table 2. Typical conditions found within industrial direct-fired pulverised coal burners (Mullinger & Jenkins 2008;Nathan et al 2012;Smoot & Smith 1985).…”

Section: Introductionmentioning

confidence: 99%

Influence of Stokes number on the velocity and concentration distributions in particle-laden jets

2014

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“…Three-dimensional (3D) measurements have been long desired for the study of many thermal-fluid topics to resolve the 3D spatial structures inherent in turbulent flows [1,2]. Furthermore, instantaneous measurements with proper temporal resolution are of particular importance due to the dynamic and transient nature of turbulent flows [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, instantaneous measurements with proper temporal resolution are of particular importance due to the dynamic and transient nature of turbulent flows [1,2]. Possible options that can potentially meet both the spatial and temporal requirements seem to be very limited and most of the existing efforts can be broadly divided into two categories [3,4].…”

Section: Introductionmentioning

confidence: 99%

Practical aspects of implementing three-dimensional tomography inversion for volumetric flame imaging

Cai

2013

Appl. Opt.

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Instantaneous three-dimensional (3D) measurements have been long desired to resolve the spatial structures of turbulent flows and flame. Previous efforts have demonstrated tomography as a promising technique to enable such measurements. To facilitate the practical application, this work investigated four practical aspects for implementing 3D tomographic under the context of volumetric combustion diagnostics. Both numerical simulations and controlled experiments were performed to study: (1) the termination criteria of the inversion algorithm; (2) the effects of regularization and the determination of the optimal regularization factor; (3) the effects of a number of views; and (4) the impact of the resolution of the projection measurements. The results obtained have illustrated the effects of these practical aspects on the accuracy and spatial resolution of volumetric tomography. Furthermore, all these aspects are related to the complexity and implementing cost (both hardware cost and computational cost). Therefore, the results obtained in this work are expected to be valuable for the design and implementation of practical 3D diagnostics.

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“…Understanding, designing and optimizing flows is crucial, e.g., for improving fuel injections [1], combustions [2,3], fuel cells [4], wind turbines [5], turbomachines [6], human air and blood flows in medicine [7,8], as well as for the fundamental task of modeling flow turbulence [9]. For this purpose, optical measurement methods are essential tools that promise fast and precise field measurements of complex flows.…”

Section: Introductionmentioning

confidence: 99%

Imaging Flow Velocimetry with Laser Mie Scattering

Fischer

2017

Applied Sciences

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Abstract:Imaging flow velocity measurements are essential for the investigation of unsteady complex flow phenomena, e.g., in turbomachines, injectors and combustors. The direct optical measurement on fluid molecules is possible with laser Rayleigh scattering and the Doppler effect. However, the small scattering cross-section results in a low signal to noise ratio, which hinders time-resolved measurements of the flow field. For this reason, the signal to noise ratio is increased by using laser Mie scattering on micrometer-sized particles that follow the flow with negligible slip. Finally, the ongoing development of powerful lasers and fast, sensitive cameras has boosted the performance of several imaging methods for flow velocimetry. The article describes the different flow measurement principles, as well as the fundamental physical measurement limits. Furthermore, the evolution to an imaging technique is outlined for each measurement principle by reviewing recent advances and applications. As a result, the progress, the challenges and the perspectives for high-speed imaging flow velocimetry are considered.

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Recent advances in the measurement of strongly radiating, turbulent reacting flows

Cited by 75 publications

References 164 publications

Influence of Stokes number on the velocity and concentration distributions in particle-laden jets

Influence of Stokes number on the velocity and concentration distributions in particle-laden jets

Practical aspects of implementing three-dimensional tomography inversion for volumetric flame imaging

Imaging Flow Velocimetry with Laser Mie Scattering

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