Numerical Computation of Turbulent Flow Fields in a Fan-stirred Combustion Bomb

Zhang, Feichi; Zirwes, Thorsten; Habisreuther, Peter; Zarzalis, Nikolaos; Bockhorn, Henning; Trimis, D.

doi:10.1080/00102202.2019.1665520

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…LES is considered as an attractive method since it provides a satisfactory compromise predictive accuracy and computational costs. Although a couple of successful examples of its use in studies on small fan-stirred combustion vessel have been reported in the literature (Zhang, 2019 ; Bonhomme et al, 2014 ), LES modeling on MK-II which features the largest volume (inner diameter 380 mm) still challenges the capabilities of existing computational resources.…”

Section: Numerical Methodologymentioning

confidence: 99%

“…Such a large size ensures minimal impact of wall confinement and radiation. Zhang et al (2019) used the CFD to study the turbulent flow fields in a small stainless steel spherical vessel of 2.28 liters capacity and a diameter of 190 mm, with eight variable speed fans. Bonhomme et al (2014) computed the turbulent flow in a closed vessel stirred by six fans, with a diameter of 200 mm, at low levels of turbulence up to u ′ =3 m/s.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental study on turbulence statistics in a large fan-stirred combustion vessel

Morsy

Jiang

2021

Exp Fluids

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Particle image velocimetry (PIV) has become a popular non-intrusive tool for measuring various types of flows. However, when measuring three-dimensional flows with two-dimensional (2D) PIV, there are some uncertainties in the measured velocity field due to out-of-plane motion, which might alter turbulence statistics and distort the overall flow characteristics. In the present study, three different turbulence models are employed and compared. Mean and fluctuating fields obtained by three-dimensional computational fluid dynamics modeling are compared to experimental data. Turbulence statistics such as integral length scale, Taylor microscale, Kolmogorov scale, turbulence kinetic energy, dissipation rate, and velocity correlations are calculated at different experimental conditions (i.e., pressure, temperature, fan speed, etc.). A reasonably isotropic and homogeneous turbulence with large turbulence intensities is achieved in the central region extending to almost 45 mm radius. This radius decreases with increasing the initial pressure. The influence of the third dimension velocity component on the measured characteristics is negligible. This is a result of the axisymmetric features of the flow pattern in the current vessel. The results prove that the present vessel can be conveniently adopted for several turbulent combustion studies including mainly the determination of turbulent burning velocity for gaseous premixed flames in nearly homogeneous isotropic turbulence. Graphic abstract

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Section: Numerical Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on turbulence statistics in a large fan-stirred combustion vessel

Morsy

Jiang

2021

Exp Fluids

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A Method to Simulate an Outwardly Propagating Turbulent Premixed Flame at Constant Pressure

Kim

2024

Flow Turbulence Combust

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An outwardly propagating premixed flame in homogeneous isotropic turbulence at constant pressure is considered one of canonical configurations to study turbulent premixed flames. In this paper, a surface forcing method to prevent the undesirable influence of the boundary-condition-induced backflow on the flame evolution, while maintaining the constant pressure, in the simulation of the outwardly propagating flame is presented. The method is validated for laminar and turbulent flames. The results show that the present method well preserves the characteristics of turbulence and of an outwardly propagating flame, without the undesirable influence of the boundary condition, by feeding the homogeneous turbulence relative to the velocity field induced by the volume expansion due to heat release to the domain in which the flame develops.

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Effect of turbulent mixing on combustion behaviours of a single biomass pellet

Guo

et al. 2023

Fuel

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Numerical Computation of Turbulent Flow Fields in a Fan-stirred Combustion Bomb

Cited by 3 publications

References 23 publications

Numerical and experimental study on turbulence statistics in a large fan-stirred combustion vessel

Numerical and experimental study on turbulence statistics in a large fan-stirred combustion vessel

A Method to Simulate an Outwardly Propagating Turbulent Premixed Flame at Constant Pressure

Effect of turbulent mixing on combustion behaviours of a single biomass pellet

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