The Effect of Swirl on Boundary Layer - Flashback …Flashback in Planar Channels Gruber et al.,...
Transcript of The Effect of Swirl on Boundary Layer - Flashback …Flashback in Planar Channels Gruber et al.,...
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TheEffectofSwirlonBoundaryLayer-FlashbackProcessesforHydrogen-Rich
Gas-TurbineCombustion
JamesBaileyEdwardRichardson
Weacknowledgefinancialsupport fromtheEPSRCCentreforDoctoralTraininginNextGenerationComputationalModellinggrantEP/L015382/1.
12/09/2019
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Background
https://www.researchgate.net/profile/Ieuan_Owen/publication/282796815/figure/fig14/AS:668870398464013@1536482538619/A-Siemens-industrial-gas-turbine-engine-showing-the-components-of-a-generic-DLE.png
• Industrialgasturbines• Fuel-flexibleburnerandalternativefuels
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Flashback
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FlashbackinPlanarChannels
Gruberetal.,JournalFluidMechanics,2012,709,516-542
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FlashbackinSwirlingFlows
Ebi andClemens,CombustionandFlame,2016,168, 39-52
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FlashbackinSwirlingFlows
Ebi andClemens,CombustionandFlame,2016,168, 39-52
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Methodology
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Methodology
Floworientation
Radialpressuregradient
𝐹𝑟 = ∞ 𝐹𝑟 = 0.25
Normal
Oblique
𝑓
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Methodology
• Physicalaspectsofswirl:• Floworientation
Flamefront
𝜃 = 45°Oblique flow
𝜃 = 90°Normalflow
Flowdirection
Δ𝑥01
Δ𝑥01
2Δ𝑥01
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Methodology
• Physicalaspectsofswirl:• Radialpressuregradient
𝑓
3435= 𝜌 78
9
5= 𝑔
𝑟𝐹𝑟 = 𝑆<𝑔=𝛿?
𝑔= = 𝑔𝜌@ − 𝜌B𝜌@
𝑟
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Methodology• Reacting,turbulentchannelflow• DirectNumericalSimulation• Fullycompressibleflow• Detailedchemistry• Time-evolvingturbulence• Combustioncode:S3D
𝑅𝑒E = 180
ℎ = 5.76𝑚𝑚
𝑈B@?M = 43𝑚/𝑠
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Methodology
𝑆Q𝑆<= 𝑓𝐼S
𝐴Q𝐴?
Turbulentflamespeed
Laminarflamespeed
Flowfactor
Intensificationfactor
Turbulentflamearea
Laminarflamearea
𝑆Q𝑆<
𝑓
𝐼S
𝐴Q
𝐴?
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Methodology
𝑆Q𝑆<= 𝑓𝐼S
𝐴Q𝐴?
Turbulentflamespeed
Laminarflamespeed
Flowfactor
Intensificationfactor
Turbulentflamearea
Laminarflamearea
𝑆Q𝑆<
𝑓
𝐼S
𝐴Q
𝐴?
Edgeflame
𝑈U𝑆<S~
𝜌@𝜌B
W/X
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Results– ObliqueFlow
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FlameShape
NormalFlow ObliqueFlow
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FlashbackSpeed
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𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓Bodyforce
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FlameSurfaceDensity
𝑦1 = 5
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𝑦1 = 5
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↓Bodyforce
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Stretch𝑦1 = 5
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DisplacementSpeed
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𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↑ ↓ ↓Bodyforce
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Flowfactor
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce
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Results– BodyForce
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FlameShape
Nobodyforce Bodyforce𝐹𝑟 = ∞ 𝐹𝑟 = 0.25
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FlashbackSpeed
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𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce ↑
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FlameSurfaceDensity
𝑦1 = 5
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𝑦1 = 5
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce ↓ ↑
![Page 30: The Effect of Swirl on Boundary Layer - Flashback …Flashback in Planar Channels Gruber et al., Journal Fluid Mechanics, 2012, 709, 516-542 Flashback in Swirling Flows Ebi and Clemens,](https://reader034.fdocuments.in/reader034/viewer/2022050207/5f59f6f3b8fbd837724c2da3/html5/thumbnails/30.jpg)
Stretch 𝑦1 = 5
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DisplacementSpeed
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𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce ↔ ↓ ↑
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FlowFactor
𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -
Oblique ↓ ↑ ↓ ↓Bodyforce ↑ ↔ ↓ ↑
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Buoyancy
𝑢U = 0.7 𝑔(𝜌@ − 𝜌B)
𝜌`ℎU
𝑔 = 𝜌𝑉bX
𝑟
𝑢U ℎU
Averagedensity𝜌`
𝑈B@?M − 𝑢U ≈ 42𝑚/𝑠
𝑈B@?M − 𝑉U ≈ 55𝑚/𝑠
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Conclusions
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Conclusions
• Darrieus-Landauhydrodynamicinstabilitydominateseffectsofstreaks• Flowdiversionandbuoyancyhavesignificanteffectsonflamepropagation
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FutureWork
• Simulationofannulususingaxi-symmetricco-ordinates
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Thankyou
Weacknowledgefinancialsupport fromtheEPSRCCentreforDoctoralTraininginNextGenerationComputationalModellinggrantEP/L015382/1.
12/09/2019
JamesBailey– [email protected]