TheEffectofSwirlonBoundaryLayer-FlashbackProcessesforHydrogen-Rich

Gas-TurbineCombustion

JamesBaileyEdwardRichardson

Weacknowledgefinancialsupport fromtheEPSRCCentreforDoctoralTraininginNextGenerationComputationalModellinggrantEP/L015382/1.

12/09/2019

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

Flashback

FlashbackinPlanarChannels

Gruberetal.,JournalFluidMechanics,2012,709,516-542

FlashbackinSwirlingFlows

Ebi andClemens,CombustionandFlame,2016,168, 39-52

FlashbackinSwirlingFlows

Ebi andClemens,CombustionandFlame,2016,168, 39-52

Methodology

Methodology

Floworientation

Radialpressuregradient

𝐹𝑟 = ∞ 𝐹𝑟 = 0.25

Normal

Oblique

𝑓

Methodology

• Physicalaspectsofswirl:• Floworientation

Flamefront

𝜃 = 45°Oblique flow

𝜃 = 90°Normalflow

Flowdirection

Δ𝑥01

Δ𝑥01

2Δ𝑥01

Methodology

• Physicalaspectsofswirl:• Radialpressuregradient

𝑓

3435= 𝜌 78

9

5= 𝑔

𝑟𝐹𝑟 = 𝑆<𝑔=𝛿?

𝑔= = 𝑔𝜌@ − 𝜌B𝜌@

𝑟

Methodology• Reacting,turbulentchannelflow• DirectNumericalSimulation• Fullycompressibleflow• Detailedchemistry• Time-evolvingturbulence• Combustioncode:S3D

𝑅𝑒E = 180

ℎ = 5.76𝑚𝑚

𝑈B@?M = 43𝑚/𝑠

Methodology

𝑆Q𝑆<= 𝑓𝐼S

𝐴Q𝐴?

Turbulentflamespeed

Laminarflamespeed

Flowfactor

Intensificationfactor

Turbulentflamearea

Laminarflamearea

𝑆Q𝑆<

𝑓

𝐼S

𝐴Q

𝐴?

Methodology

𝑆Q𝑆<= 𝑓𝐼S

𝐴Q𝐴?

Turbulentflamespeed

Laminarflamespeed

Flowfactor

Intensificationfactor

Turbulentflamearea

Laminarflamearea

𝑆Q𝑆<

𝑓

𝐼S

𝐴Q

𝐴?

Edgeflame

𝑈U𝑆<S~

𝜌@𝜌B

W/X

Results– ObliqueFlow

FlameShape

NormalFlow ObliqueFlow

FlashbackSpeed

𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -

Oblique ↓Bodyforce

FlameSurfaceDensity

𝑦1 = 5

𝑦1 = 5

𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -

Oblique ↓ ↓Bodyforce

Stretch𝑦1 = 5

DisplacementSpeed

𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -

Oblique ↑ ↓ ↓Bodyforce

Flowfactor

𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -

Oblique ↓ ↑ ↓ ↓Bodyforce

Results– BodyForce

FlameShape

Nobodyforce Bodyforce𝐹𝑟 = ∞ 𝐹𝑟 = 0.25

FlashbackSpeed

𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -

Oblique ↓ ↑ ↓ ↓Bodyforce ↑

FlameSurfaceDensity

𝑦1 = 5

𝑦1 = 5

𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -

Oblique ↓ ↑ ↓ ↓Bodyforce ↓ ↑

Stretch 𝑦1 = 5

DisplacementSpeed

𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -

Oblique ↓ ↑ ↓ ↓Bodyforce ↔ ↓ ↑

FlowFactor

𝑓 𝐼S 𝐴Q /𝐴< 𝑆Q /𝑆<Normal - - - -

Oblique ↓ ↑ ↓ ↓Bodyforce ↑ ↔ ↓ ↑

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

Conclusions

Conclusions

• Darrieus-Landauhydrodynamicinstabilitydominateseffectsofstreaks• Flowdiversionandbuoyancyhavesignificanteffectsonflamepropagation

FutureWork

• Simulationofannulususingaxi-symmetricco-ordinates

Thankyou

Weacknowledgefinancialsupport fromtheEPSRCCentreforDoctoralTraininginNextGenerationComputationalModellinggrantEP/L015382/1.

12/09/2019

JamesBailey– j.r.bailey@soton.ac.uk