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Flow Separation on the Suction Surface of a Pak-B Low ...
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Flow Separation on the Flow Separation on the Suction Surface of a Pak Suction Surface of a Pak - - B B Low Pressure Turbine Blade Low Pressure Turbine Blade David Erwert David Erwert Dr. Kenneth Van Treuren Dr. Kenneth Van Treuren Baylor University ECS Scholar’s Day January 27, 2007
Transcript of Flow Separation on the Suction Surface of a Pak-B Low ...
Flow Separation on the Flow Separation on the Suction Surface of a PakSuction Surface of a Pak--B B Low Pressure Turbine BladeLow Pressure Turbine Blade
David ErwertDavid ErwertDr. Kenneth Van TreurenDr. Kenneth Van Treuren
Baylor University ECS Scholar’s DayJanuary 27, 2007
OverviewOverview
Gas Turbine Flow SeparationGas Turbine Flow SeparationDevelopment of the Baylor FacilityDevelopment of the Baylor FacilityScope and Results of the Present ProjectScope and Results of the Present ProjectRecommendationsRecommendations
The Gas Turbine EngineThe Gas Turbine EngineFan
Compressor
High Pressure Turbine
Low Pressure Turbine
Combustor
Turbine FlowTurbine Flow
Pak B Blade ProfilePak B Blade Profile
Low Pressure Turbine SeparationLow Pressure Turbine Separation
Commercial Aircraft Commercial Aircraft Operating at High Operating at High Altitudes (43,000 ft)Altitudes (43,000 ft)
UAVUAV’’ss (65,000 ft)(65,000 ft)
New Generation New Generation Business Jets Business Jets (50,000+ ft)(50,000+ ft)
Separated Flow = Lower EfficiencySeparated Flow = Lower EfficiencyLower efficiency means burning more fuelLower efficiency means burning more fuel
µρaxiallV∞=Re
Turbine FailureTurbine Failure
Baylor University Wind TunnelBaylor University Wind Tunnel
Modified Baylor Wind TunnelModified Baylor Wind Tunnel
Simulating Turbine FlowSimulating Turbine Flow
Matching the Pak B ProfileMatching the Pak B Profile
Pak B Blade vs. Tunnel Profile at 50,000 Re
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% Suction Surface Length
cp
Pak B Blade Baylor Tunnel Profile2
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∞
−=
V
PPC so
p
ρ
Simulator ImprovementsSimulator Improvements
Verification of Flow SeparationVerification of Flow SeparationTunnel Calibration Re=100k 1% Tu
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0.5
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2.5
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0 10 20 30 40 50 60 70 80 90 100% Suction Surface Length
Cp
Pak B Airfoil Experimental Tunnel Baseline
Region of Separation
ExperimentsExperiments
Passive Flow Control Methods
-Triangular Vortex Generators
-Bumps
-Dimples (round and square)
Tested at 50%, 55%, 60% SSL
Triangular Vortex GeneratorsTriangular Vortex Generators
Flow Direction
Implementation of Passive Implementation of Passive TechniquesTechniques
Vortex Generators Re=100k 1% Tu
0.000.501.00
1.502.002.503.003.50
4.004.505.00
0 10 20 30 40 50 60 70 80 90 100
% Suction Surface Length
Cp
Experimental Tunnel Baseline Vortex Generators Orientation 1
““BumpsBumps””
DimplesDimples
Wider ApplicationWider Application
Wind TurbinesWind Turbines
Wind Turbine Blade Profile
ConclusionsConclusionsFlow separation on Low Pressure Turbines is a Flow separation on Low Pressure Turbines is a real problem real problem
Loss of efficiencyLoss of efficiencyMore fuel requiredMore fuel requiredHigh cost of fuelHigh cost of fuel
Passive Flow Control Techniques are Passive Flow Control Techniques are Successful in Eliminating Regions of SeparationSuccessful in Eliminating Regions of Separation
Should eliminate lossesShould eliminate lossesCould be machined onto new bladesCould be machined onto new blades
Future NeedsFuture NeedsDetermination of downstream momentum deficitDetermination of downstream momentum deficitBetter PakBetter Pak--B Correlation, possibly shorten the B Correlation, possibly shorten the plateplateInvestigate Heat transfer of plate with and Investigate Heat transfer of plate with and without flow controlwithout flow control
Any Questions?Any Questions?
