EXPERIMENTAL INVESTIGATION RESULTS OF A HYBRID CERAMIC AND ACTIVELY COOLED BALL BEARING FOR GAS TURBINES
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1 EXPERIMENTAL INVESTIGATION RESULTS OF A HYBRID CERAMIC AND ACTIVELY COOLED BALL BEARING FOR GAS TURBINES 13 October 2016 Brussels, Belgium Dr.-Ing. P. Glöckner FAG Aerospace GmbH & Co.KG
2 HYBRID CERAMIC AND ACTIVELY COOLED BALL BEARING FOR GAS TURBINES 1 2 Motivation & Goal Test Bearing and Rig Test Head Design, Test Conditions 3 Ergebnisse Experimental Investigation Results: Oil Flow 4 Experimental Investigation Results: Temperatures 5 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 6 High Speed Capability 7 Conclusion & Outlook 1
3 Motivation & Goal 1 2 Motivation & Goal Test Bearing and Rig Test Head Design, Test Conditions 3 Ergebnisse Experimental Investigation Results: Oil Flow 4 Experimental Investigation Results: Temperatures 5 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 6 High Speed Capability 7 Conclusion & Outlook 2
4 Motivation Ball Bearing Friction Power Cage / Land, Cage / Ball Friction Power Contact Friction Power Cage / Land, Cage / Ball Friction Power Contact Friction Power Churning Friction Power Churning Friction Power Goal: Reduction of bearing power loss and thermal stressing. 3
5 Motivation For under-race lubricated bearings the outer ring is the temperature-critical component. 4
6 Motivation Influence of Under - Race Oil Flow on Bearing Power Loss D m n= 2.8 Mio mm/min D m n= 2.5 Mio mm/min D m n= 2.2 Mio mm/min D m n= 1.8 Mio mm/min A power loss reduction can be achieved by lower oil quantities but we also need to control the raceway temperature 5
7 Motivation Speed Index increases continuously for HP-Bearings 6
8 Motivation & Goal ECO-POLITICS The goals described by the European Commision and The Advisory Council for Aeronautics (ACARE) in "Flightpath 2050": reduction of 75% CO 2, 90% NO x, and 65% noise compared to capabilities of typical new aircraft in the year END USER REQUIREMENTS End user require more efficient and performance-enhanced engine components. Approximately one third of an airline s total operating costs are contributed by kerosene costs. TECHNICAL REQUIREMENTS Rolling element bearings determine significantly the mechanical efficiency of an aircraft engine Today's state of the art main shaft bearing feature squeeze film damping in order to reduce vibrational loads 7
9 Motivation & Goal Goal: Increase of Reliability, Performance and Efficiency of Aircraft Engine Ball Bearings Further additional reduction compared to an all-steel bearing: bearing power loss: 10 % required total oil flow: 15 % damping of rotor vibrations temperatures: 10 K increase of max. rotor speed by 20% Measures: Use of: ceramic balls integrated squeeze film damper direct outer ring cooling concept plasma nitrided raceways 8
10 Test Bearing and Rig Test Head Design, Test Conditions 1 2 Motivation & Goal Test Bearing and Rig Test Head Design, Test Conditions 3 Ergebnisse Experimental Investigation Results: Oil Flow 4 Experimental Investigation Results: Temperatures 5 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 6 High Speed Capability 7 Conclusion & Outlook 9
11 Test Bearing and Rig Test Head Design, Test Conditions Test Bearing Design oil distribution groove outer ring 2 (M50Nil) outer ring1 (M50Nil) Piston Ring Grooves Squeeze Film Damper Oil-in cooling oil Outer ring cooling channel Silver plated cage Duplex-hardened raceways Ceramic balls (Si 3 N 4 ) Inner ring 1 (M50Nil) Inner ring 2 (M50Nil) Radial slots in split face for "under-race" lubrication 10
12 Test Bearing and Rig Test Head Design, Test Conditions Bearing Components prior to Rig Test outward outer ring featuring piston ring grooves for squeeze film damping inward outer ring featuring helical cooling channel loaded inner ring with radial oil slots in the split face cage/ball assembly 11
13 Test Bearing and Rig Test Head Design, Test Conditions Test Rig: AN62 Location: Schweinfurt, Germany Speed Capability: depending on gearbox installed; w/ current gearbox up to rpm Motor Power: 120 kw (161 hp) Axial and radial loads up to 200 kn (45,000 lbf), misalignment testing capability for tests with co- and counter-rotating bearings (intershaft bearings) three independent oil systems sensor technology: static, telemetry, vibrations, piezo, strain gages, chip detectors, cage speed, etc. 12
14 Test Bearing and Rig Test Head Design, Test Conditions Test Conditions: Rotational Speed: rpm (D m n = 2,35 to 4 Mio mm/min) Axial Load: 26,7-80 kn (p 0 = 1540 to 2440 MPa, [224 to 354 ksi]) Oil In Temperature: 80 C and 110 C (176 and 230 F) Under-race Oil Flow: 5, 6, 8, 10, 12 (14, 15) l/min (1.3 to 4 gallons/min) Outer Ring Channel Oil Flow: 0, 1, 2, 3, 4, 6, 8, 10 l/min (up to 0.8 gallons/min) Engine Oil per MIL-PRF Measured Variables: Outer and Inner Ring Temperatures Bearing Power Loss Oil Flow Qty, Oil Pressure, Oil Temperatures Vibrational Accelartion Axial Load, Shaft Rotational Speed 13
15 Test Bearing and Rig Test Head Design, Test Conditions 14
16 Hertzian Stress p 0 [MPa] 8th International Gas Turbine Conference - The Future of Gas Turbine Technology Test Bearing and Rig Test Head Design, Test Conditions Hertzian Stress 2300 F Thrust = 26,7 kn, V nom = 10 l/min, V o = 2 l/min, T Oil In = 80 C hybrid bearing, inner ring raceway hybrid bearing, outer ring raceway all-steel bearing, inner ring raceway (calculated) all-steel bearing, outer ring raceway (calculated) identical Hertzian stresses for outer and inner race of steel brg Rotational Speed [rpm] identical Hertzian stresses for outer and inner race of hybrid brg 15
17 Experimental Investigation Results: Oil Flow 1 2 Motivation & Goal Test Bearing and Rig Test Head Design, Test Conditions 3 Experimental Investigation Results: Oil Flow 4 Experimental Investigation Results: Temperatures 5 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 6 High Speed Capability 7 Conclusion & Outlook 16
18 Experimental Investigation Results Pictures of rig tested hybrid bearing loaded inner ring half cage/ball assembly outer ring bearing with one inner ring half removed, showing the ceramic balls and the cage bearing side view 17
19 Experimental Investigation Results: Oil Flow m W, left mw, right m nom Scoop Efficiency very similar between all-steel and hybrid bearing enables direct comparison of steel and hybrid bearing 18
20 Experimental Investigation Results: Temperatures 1 2 Motivation & Goal Test Bearing and Rig Test Head Design, Test Conditions 3 Ergebnisse Experimental Investigation Results: Oil Flow 4 Experimental Investigation Results: Temperatures 5 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 6 Summary and Conclusion 19
21 Experimental Investigation Results: Temperatures 20
22 Experimental Investigation Results: Temperatures 21
23 Experimental Investigation Results: Temperatures 22
24 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 1 2 Motivation & Goal Test Bearing and Rig Test Head Design, Test Conditions 3 Ergebnisse Experimental Investigation Results: Oil Flow 4 Experimental Investigation Results: Temperatures 5 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 6 High Speed Capability 7 Conclusion & Outlook 23
25 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) HTO m w c p ( T T ) OilIn Oilout 24
26 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 25
27 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 26
28 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 27
29 High Speed Capability 1 2 Motivation & Goal Test Bearing and Rig Test Head Design, Test Conditions 3 Ergebnisse Experimental Investigation Results: Oil Flow 4 Experimental Investigation Results: Temperatures 5 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 6 High Speed Capability 7 Conclusion & Outlook 28
30 High Speed Capability D m n = 4,02 Mio mm/min Speed Index > 4 Mio mm/min at T OR < 200 C achieved by selective adjustment of under-race and outer ring channel oil flow quantity 29
31 High Speed Capability 30
32 Conclusion & Outlook 1 2 Motivation & Goal Test Bearing and Rig Test Head Design, Test Conditions 3 Ergebnisse Experimental Investigation Results: Oil Flow 4 Experimental Investigation Results: Temperatures 5 Experimental Investigation Results: Bearing Power Loss & Heat to Oil (HTO) 6 High Speed Capability 7 Conclusion & Outlook 31
33 Conclusion & Outlook FAG Aerospace GmbH & Co.KG Specific Benefits: Oil Flow Savings up to 50 % Power Loss Reduction up 25 % up to 25 K lower temperatures High speed capability above mm/min Direct Outer Ring Cooling Squeeze Film Damping Overall Benefits Increase in mechanical efficiency (bearing & engine) Reduction of weight (smaller oil pump etc.) Reduction of engine fuel consumption Reduction of engine emissions Improvement in material fatigue strength (from lower brg temperature) Increase of reliability Reduction of total cost Ceramic Balls Nitrided Races
34 Conclusion & Outlook FAG Aerospace GmbH & Co.KG Fuel Consumption Benefit by using Direct Outer Ring Cooled Hybrid Ball Bearing Calculation Example: Bearing Power Loss Reduction: 4 kw per bearing #3 ball bearing (HP shaft) with DORC 4 kw saving per gas turbine Heat Value (Jet A1): kj/kg Overall Engine Efficiency: 38 % Gas Turbine fleet: approx engines in service Source: GE Aviation Kerosene savings per engine: 7800 kg/a (CO 2 savings: 25 t/a) Kerosene savings for fleet: t/a (CO 2 savings: t/a) USD savings* for fleet: 16 Mio USD/a (45000 USD/d) USD savings** for fleet: 31 Mio USD/a (84000 USD/d) * US$/bbl = 53; ** US$/bbl = 100;
35 HYBRID CERAMIC AND ACTIVELY COOLED BALL BEARING FOR GAS TURBINES Thank you for your attention! 34
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