Three component velocity measurements of an isothermal confined swirling flow

Ahmed, Syed Amjad

doi:10.1243/0954410971532541

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…In particular, in confined pipe flow, a number of experimental studies (e.g. [1]) have observed that in some cases the recirculation zone is not highly localised, but rather has a long "tail" of weak reverse flow that persists far downstream of the front stagnation point, a phenomenon for which no explanation has apparently been proposed to date. However, the porous rotating disk flow with injection considered here has the right features of a stagnation point and an outer reverse axial flow, which suggests the following qualitative explanation.…”

Section: Discussionmentioning

confidence: 99%

Note on porous rotating disk flow

Kelson¹,

Desseaux²

2000

ANZIAMJ

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Section: Discussionmentioning

confidence: 99%

Note on porous rotating disk flow

Kelson¹,

Desseaux²

2000

ANZIAMJ

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“…The flow rate system was controlled using an in-house LabVIEW program to guarantee the reliability and reproducibility of the results. The Sauter mean diameter (SMD) of the majority of droplets from this Danfoss commercial nozzle is less than 60 µm, and the corresponding Stokes number of the majority of droplets was calculated to be ≪1 [23,24], making the spray droplets a good tracer for the flow field measurements in this work. The conditions of the test cases are listed in Table 1, and both non-reacting and reacting flows were conducted and compared for every case.…”

Section: Combustor Facilitymentioning

confidence: 98%

Experimental Investigation on the Symmetry and Stabilization of Ethanol Spray Swirling Flames Utilizing Simultaneous PIV/OH-PLIF Measurements

Wang,

Fu,

Wang

et al. 2024

Symmetry

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A detailed experimental study of ethanol spray swirling flames was performed in an axial bluff body stabilized burner. The characteristics of the non-reacting and reacting sprays were recorded by particle imaging velocimetry (PIV) and planar laser-induced fluorescence (PLIF) of the OH radical. A few typical flames with different structures (outer-side-flame-lifting, stable, and near-blow-off) were compared and analyzed. The parameters of the spray, including the spray half-angle (α) and droplet number density (nd), are quantified, and it has been found the flame structure and stability were strongly correlated with the droplet distribution. Several parameters of the flow field, such as velocity magnitude (|U| vorticity (ωz), and turbulent kinetic energy (TKE), are quantitively analyzed, and it is observed that the local strain rate rose as the air flow rate increased, which is not conducive to local flame stability. Regarding the flame, quantities such as progress variable (<c>), flame height (Lf), lift–off height (hlf), and symmetry factor (Snd and S<c>) are calculated, and it can be observed that the flame symmetry keeps worsening when approaching blow–off, and the inner flame branch exhibits a worse stabilization than the outer one. Our comprehensive investigations offer a deeper understanding of stable combustion in such two–phase flames.

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“…where, 𝜕 𝑓 is the distance between the two fringes and 𝑓 𝑑 is measured signal frequency Depending on the location of the probe volume, in the present study, the average data rate of 500 samples/s is maintained for all the measurements. To reduce the statistical uncertainties in the measurement, a around 5000 realizations are collected at each measurement location, as suggested in (Ahmed 1997). Finally, flow sizer software provided by TSI Inc, is used to acquire, and analyse the data.…”

Section: 𝑢 = 𝜕 𝑓 𝑓 𝑑mentioning

confidence: 99%

Effect of Confinement on Recirculation Structures in Isothermal Coaxial Swirling Jet

Santhosh

Pattanshetti

Chaturvedi

2023

Preprint

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In this work, an experimental and numerical investigation of effect of two confinement ratios (CR=1.81, and 2.7) on two different recirculation zones (RZs) viz., prevortex breakdown bubble (PVB) and central toroidal recirculation zone (CTRZ) observed in coaxial swirling jet in isothermal/non-reacting conditions is presented. As a part of experimental study 2-D laser Doppler velocimetry (LDV) has been used to acquire mean axial velocity values at different points within the non-reacting/isothermal flow field. 3D unsteady RANS simulations are carried out to evaluate the performance of different turbulent models in predicting the two types of RZs in confined condition. Radial profiles of mean axial velocity and extent (dimensions) of recirculation zones (RZs) obtained experimentally are used as parameters to compare the numerical results consequently to evaluate suitable turbulent models in simulating two types RZs. Finally, the numerical results obtained by employing best suitable turbulent model are used to gain more physical insights into the flow field of confined coaxial swirling jets. Results showed that flow confinement has a significant effect on the two types RZs studied. Furthermore, the effect of confinement ratio CR=2.7 is found more similar as that of unconfined case whereas, the wall/confinement effect is strongly witnessed in CR = 1.81 case for both PVB and CTRZ flow states.

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Three component velocity measurements of an isothermal confined swirling flow

Cited by 6 publications

References 20 publications

Note on porous rotating disk flow

Note on porous rotating disk flow

Experimental Investigation on the Symmetry and Stabilization of Ethanol Spray Swirling Flames Utilizing Simultaneous PIV/OH-PLIF Measurements

Effect of Confinement on Recirculation Structures in Isothermal Coaxial Swirling Jet

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