Turbulent dense gas flow characteristics in swirling conical diffuser

From, Christopher; Sauret, Emilie; Armfield, S.W.; Saha, Suvash C.; Gu, Yuantong

doi:10.1016/j.compfluid.2017.03.021

Cited by 16 publications

(10 citation statements)

References 37 publications

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“…performed for the first time DG simulations for laminar and turbulent external flows over airfoils and flat plates using Reynolds-averaged Navier-Stokes equations with the simple algebraic model of Baldwin and Lomax in the latter case. Harinck et al (2010b), Wheeler & Ong (2013) and From et al (2017) subsequently achieved simulations of turbulent DG flows using, respectively, k-ε and k-ω two-equation models, Spalart-Allamaras one-equation model and an explicit algebraic Reynolds stress model. Dura Galiana, Wheeler & Ong (2016) also performed large-eddy simulations (LES) of turbulent DG flow over a turbine vane using the Smagorinsky-Lilly model.…”

Section: Introductionmentioning

confidence: 99%

Analysis of turbulence characteristics in a temporal dense gas compressible mixing layer using direct numerical simulation

2020

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Section: Introductionmentioning

confidence: 99%

Analysis of turbulence characteristics in a temporal dense gas compressible mixing layer using direct numerical simulation

2020

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“…Clausen et al [6] took detailed measurements of a swirling boundary layer developing in a conical diffuser of included angle 20° and area ratio 2.84, depicted in figure 3. This test case became known as the ERCOFTAC conical diffuser and has been the subject of multiple numerical studies [17][18][19][20][21]. The swirl generator produced an inlet swirl profile of a solidbody rotation and near-uniform axial velocity in the core region.…”

Section: Ercoftac Conical Diffusermentioning

confidence: 99%

Numerical Investigation of Pressure Recovery for an Induced Draught Fan Arrangement

Bekker

Meyer

Spuy

2020

rdj

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This study investigates the potential gain in operating volume flow rate and static efficiency for an induced draught fan arrangement by reducing the outlet kinetic energy loss. The reduction is achieved through pressure recovery, which is the conversion of dynamic pressure into static pressure. Downstream diffusers, stator blade rows, or a combination of these can recover pressure. Six different discharge configurations are tested for a fan. An annular diffuser with equiangular walls at an angle of 22° from the axial direction and a length equal to the fan diameter recovers the most pressure over a range of volume flow rates. The diffuser causes the operating volume flow rate and static efficiency to increase by 6.3 % (relative) and 20 % (absolute), respectively, compared to the initial design point of the particular fan.

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“…The well-defined boundary layer characteristics are displacement thickness, δ * , the momentum thickness, θ, and shape factor, ε. They are calculated [15,19]:…”

Section: Boundary Layer Characteristicsmentioning

confidence: 99%

“…Okhio et al [14] selected Prantl mixing length model to calculate the mean velocities in a wide-angle conical diffuser. Recently, From et al [15] modeled turbulent swirling flow in a conical diffuser using the Explicit Algebraic Reynolds stress model. The present work is mainly concerned with the experimental study of the flow and boundary layer development in conical diffusers with the steady, uniform flow and moderate swirl type distorted flow at the entry of the diffuser.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations of flow through wide angle conical diffusers with uniform flow and swirl type velocity distortions at inlet

Hemalatha

Natarajan

2018

THERM SCI

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Swirl is a tangential velocity component of the fluid flow and is often present in the conical diffuser as a result of rotating machinery in the upstream section. The present experimental work is dedicated to study the effect of moderate swirl on wide angle conical diffuser performance and flow development. The experiments were performed in a low-speed open circuit wind tunnel. There are two different diffusers having a cone angle of 14° (with an area ratio 3.0) and 20° (with an area ratio 4.2) were selected for this investigation. The flow parameters have been measured using DANTEC DYNAMICS make constant temperature hot-wire anemometer (CTA). The results showed that the moderate swirl can significantly improve the stalled diffuser (20° cone angle) performance; however, it has a little effect on the diffuser (14° cone angle) having incipient turbulent boundary layer separation. It was confirmed that the introduction of moderate swirl reduces the chances of flow separation in wide angle conical diffusers.

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Turbulent dense gas flow characteristics in swirling conical diffuser

Cited by 16 publications

References 37 publications

Analysis of turbulence characteristics in a temporal dense gas compressible mixing layer using direct numerical simulation

Analysis of turbulence characteristics in a temporal dense gas compressible mixing layer using direct numerical simulation

Numerical Investigation of Pressure Recovery for an Induced Draught Fan Arrangement

Experimental investigations of flow through wide angle conical diffusers with uniform flow and swirl type velocity distortions at inlet

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