Flow and mixing fields of turbulent bluff-body jets and flames

Dally, B.; Fletcher, David F.; Masri, Assaad R.

doi:10.1088/1364-7830/2/2/006

Cited by 196 publications

(152 citation statements)

References 25 publications

Supporting

Mentioning

135

Contrasting

Unclassified

Order By: Relevance

“…Modifications for the parameter C lead to a value of 1.60 for self-similar round jets [23]. As already observed [7], the numerical solution is highly sensitive to the turbulence level at the inlets.…”

Section: Numerical Modelingsupporting

confidence: 54%

Kinetic and fluid dynamics modeling of methane/hydrogen jet flames in diluted coflow

Frassoldati

Sharma

Cuoci

et al. 2010

Applied Thermal Engineering

132

View full text Add to dashboard Cite

Section: Numerical Modelingsupporting

confidence: 54%

Kinetic and fluid dynamics modeling of methane/hydrogen jet flames in diluted coflow

Frassoldati

Sharma

Cuoci

et al. 2010

Applied Thermal Engineering

132

View full text Add to dashboard Cite

“…The bluff-body stabilised flame has received special attention and been widely studied recently [3,4,8,9,12,13,19,20,28,29]. In addition to its practical interest, the bluff-body flame is a very challenging test for turbulence models as well as chemistry models.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to its practical interest, the bluff-body flame is a very challenging test for turbulence models as well as chemistry models. The flame is stabilised behind the bluff-body by the intense mixing of fuel and air and by the hot products providing a continuous ignition source in the recirculation zone [3]. In the resulting flow field, the central fuel jet is separated from the coflowing air stream by the hot recirculation zone in the wake of the bluff-body.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of a Bluff-Body Stabilised Nonpremixed Flame with Differential Reynolds-Stress Models

Naud

Roekaerts

2003

Flow, Turbulence and Combustion

View full text Add to dashboard Cite

Abstract.A numerical investigation of a bluff-body stabilised nonpremixed flame, and the corresponding nonreacting flow, has been performed with differential Reynolds-stress models (DRSMs). The equilibrium chemistry model is employed and an assumed-shape beta function PDF approach is used to represent the interaction between turbulence and chemistry. The Reynolds flux of the mixture fraction is obtained from a transport equation, hence a full second moment closure is used. To clarify the applicability of the existing DRSMs in this complex flame, several models, including LRR-IP model, JM model, SSG model as well as a modified LRR-IP model, have been applied and evaluated. The existing models, with default values of the coefficients, cannot provide overall satisfactory predictions for this challenging test case. The standard LRR-IP model over predicts the centreline velocity decay rate, and therefore does not perform satisfactory. The modified LRR-IP model, with model constant C 1 = 1.6 instead of the standard value 1.44 (here named BM-M1), gives better results for the mean velocity. However in the nonreacting case this does not lead to improvement in predicting rms fluctuating velocities especially downstream of the recirculation zone. Motivated by the need to improve the prediction, a new modification of the LRR-IP model is proposed (BM-M2), with model constant C 2 = 0.7 in the pressure strain correlation rather than the standard value 0.6. With the new modified model, a very significant improvement of the prediction of flow field is obtained in the nonreacting case, whereas in the reacting case the prediction of the flow field is of the same overall quality as with BM-M1. This shows that some DRSMs have different behaviour in the nonreacting case and the reacting case. In the reacting case also the mean and variance of mixture fraction are considered and it is found that the best results are obtained with the BM-M1 model, with SSG as second best. Combining the results for flow field and mixture fraction field it is concluded that the BM-M1 model is recommended for further studies of this bluff-body stabilised flame. Grid independence of the result is demonstrated.

show abstract

“…The flame considered is the Sydney bluff-body stabilised flame HM1 [8,9,10] which is a target flame of the International Workshop on Measurement and Computation of Turbulent Nonpremixed Flames [11].…”

Section: Turbulence Heat and Mass Transfermentioning

confidence: 99%

“…In the experimental studies [8] and [9], the jet and coflow bulk velocities were respectively 118m/s and 40m/s (flame HM1). More recently, two sets of velocity measurements were provided by Kalt and Masri [10] for reduced jet and coflow bulk velocities of 108m/s and 35m/s (flame HM1e).…”

Section: Bluff-body Stabilised Flame Hm1mentioning

confidence: 99%

Scalar PDF and velocity-scalar PDF modelling of the bluff-body stabilised flame HM1 using ILDM

Naud¹,

Merci

Roekaerts

et al. 2006

Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer

View full text Add to dashboard Cite

-Velocity-scalar and scalar PDF results are compared for the bluff-body stabilised flame HM1 using ILDM chemistry based on mixture fraction, and CO 2 and H 2 O mass fractions. The same Reynolds stress turbulence model and the same modified Curl mixing model are used. No effect of radiative heat loss is included. The results for mean velocity and Reynolds stresses are satisfactory and very similar for both calculations. Each PDF modelling approach implies a different closure for the velocity-scalar correlation. In the present calculations this leads to significant differences in the radial profiles of mean scalars and of mixture fraction variance (different scalar flux modelling): velocity-scalar PDF results (differential scalar flux model) are better than scalar PDF results (gradient diffusion). Results in composition space (scatter plots) confirm the higher quality of the velocity-scalar PDF.

show abstract

Flow and mixing fields of turbulent bluff-body jets and flames

Cited by 196 publications

References 25 publications

Kinetic and fluid dynamics modeling of methane/hydrogen jet flames in diluted coflow

Kinetic and fluid dynamics modeling of methane/hydrogen jet flames in diluted coflow

Numerical Investigation of a Bluff-Body Stabilised Nonpremixed Flame with Differential Reynolds-Stress Models

Scalar PDF and velocity-scalar PDF modelling of the bluff-body stabilised flame HM1 using ILDM

Contact Info

Product

Resources

About