Experiments on a rotating-pipe swirl burner

Hübner, A.W.; Tummers, M.J.; Hanjalić, K.; Meer, Theodorus H. van der

doi:10.1016/s0894-1777(02)00251-0

Cited by 28 publications

(13 citation statements)

References 6 publications

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“…26 Using PDA, the velocity and concentration of two-phase ow can be measured. 4,6,16,[28][29][30][31] The PDA system uses the proven phase Doppler principle for simultaneous non-intrusive and real-time measurements of three velocity components and turbulence characteristics, and makes use of new methods for determination of phase differences between Doppler signals received by three detectors located in different positions. The instrument uses 60Â ber ow optics and 57 Â 10 PDA receiver optics.…”

Section: Methodsmentioning

confidence: 99%

Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

Wang

Cheng

et al. 2018

RSC Adv.

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A three-component particle-dynamics anemometer was used to measure the characteristics of two-phase gas-particle flows in a primary air nozzle using a gas/particle two-phase test facility. The jet trajectory of primary air velocities, Reynolds stress and particle concentration profiles were obtained. Based on this, the advantages and disadvantages of increasing the offset angle were analyzed to optimize performance. The results show that gas-particle slippage is not noticeable in the furnace, even though the midsecondary air offset angle changes. Within the jet's free developing zone, the location of the peak concentration does not change with the mid-secondary air offset angles. Properly enlarging the offset angle of mid-secondary air nozzles will delay the mixing of the secondary air into the primary-air-andcoal mixture and realize horizontal-staged combustion in a furnace. It also can enhance the stability of airflow and form a better blended jet tail, meanwhile reducing the vortex at the back-fire side and avoiding a short circuiting of the airflow. It is favorable for increasing combustion efficiency and preventing slagging and high-temperature corrosion.

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Section: Methodsmentioning

confidence: 99%

Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

Wang

Cheng

et al. 2018

RSC Adv.

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“…The velocity is measured from the frequency of the Doppler burst as for LDA [21]. Using PDA, the velocity, size and concentration of two-phase flow can be measured [22][23][24][25]. The main factors that determine an accurate concentration value are the setting parameters of the PDA system, the properties of particles and particle concentration.…”

Section: Gas/particle Two-phase Experimental Equipment and Methodsmentioning

confidence: 99%

Study on flow fields of centrally fuel rich swirl burner and its applications

Chen

Jing

et al. 2009

Korean J. Chem. Eng.

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Experiments on a single-phase test facility were done to optimize primary air outlet cones of a centrally fuel rich swirl coal combustion burner. On the basis of optimized results from the single-phase test, a three-component particle-dynamics anemometer was used to measure, in the near-burner region, the characteristics of gas/particle two-phase flows for the burner with two primary air outlet cones, on a gas/particle two-phase test facility. Velocities, RMS velocities and particle volume flux profiles were obtained. According to the results, the primary air outlet cone structure of the centrally fuel rich burner was matching a 670 ton per hour boiler. The performance of the burner on a 670 ton per hour boiler was studied.

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“…Swirling motion is regarded as an efficient way to stabilize nonpremixed flames and has been used together with bluff-body stabilization, e.g. [1][2][3]. In such a configuration, a large recirculation zone with flow reversal may be formed in the core region, which carries the combustion products back towards the burner mouth, providing a continuous and stable source of energy for flame ignition.…”

Section: Introductionmentioning

confidence: 99%

“…An annular nonpremixed jet flame at different swirl numbers has been investigated. The swirling motion was introduced into the annular fuel jet itself rather than the oxidizer stream [1][2][3]. In such a configuration, the burner surface area inside the jet annulus provides bluff-body stabilization for the nonpremixed flame.…”

Section: Introductionmentioning

confidence: 99%

Swirling and Impinging Effects in an Annular Nonpremixed Jet Flame

Jiang

Luo

Goey

et al. 2010

Flow Turbulence Combust

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The effects of swirl and downstream wall confinement on an annular nonpremixed flame were investigated using direct numerical simulation (DNS). Fully three-dimensional parallel DNS was performed employing high-order numerical methods and high-fidelity boundary conditions to solve governing equations for variable-density flow and finite-rate Arrhenius chemistry. Three swirl numbers have been examined: 0 (without swirl), 0.4 and 0.8, while the effects of downstream wall confinement have been examined for swirl numbers 0 and 0.4. Results have been presented in terms of instantaneous and time-averaged flow quantities, which have also been analysed using energy spectra and proper orthogonal decomposition (POD). Effects of swirl on the fluid dynamic behaviour of the annular nonpremixed flame were found to be significant. The fluid dynamic behaviour of the flame is greatly affected by the interaction between the geometrical recirculation zone (GRZ) near the jet nozzle exit due to the annular configuration, the central recirculation zone (CRZ) associated with swirl, the unsteady vortical structures in the jet column due to the shear instability, and the downstream wall confinement. Depending on the degree of swirl, the GRZ near the burner mouth and the CRZ may co-exist or one zone may be overwhelmed by another. At a moderate swirl number, the co-existence leads to a flame with strong reaction attached to the burner mouth; while at a high swirl number, the CRZ dominates over the GRZ. The precessing vortex core was 64 Flow Turbulence Combust (2011) 86:63-88 observed to exist in the swirling flow fields. The Nusselt number distribution of the annular impinging flames differs from that of round impinging jets. The POD analysis revealed that wall effects on the flow field are mainly associated with the higher mode numbers.

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Experiments on a rotating-pipe swirl burner

Cited by 28 publications

References 6 publications

Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

Study on flow fields of centrally fuel rich swirl burner and its applications

Swirling and Impinging Effects in an Annular Nonpremixed Jet Flame

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