EVS28 KINTEX, Korea, May 3-6, 2015 Centrifugal Air Compressor for Fuel Cell Electric Vehicle Kyungseok Cho 1 , Hyunsup Yang 2 , Chiyong Park 3 Changha Lee 4 ·Chi Myung Kim 5 1,2,3 Halla Visteon Climate Control Corp., 95, Sinilseo-ro, Daedeok-gu, Daejeon, Korea 4,5 Hyundai Motor Group,17-5Mabuk-ro #240, Giheung-gu, Yongin-si,Gyeonggi-do, 446-716, Korea
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EVS28KINTEX, Korea, May 3-6, 2015
Centrifugal Air Compressor for Fuel Cell Electric Vehicle
Kyungseok Cho1, Hyunsup Yang2 , Chiyong Park3
Changha Lee4·Chi Myung Kim51,2,3Halla Visteon Climate Control Corp., 95, Sinilseo-ro, Daedeok-gu, Daejeon, Korea
4,5 Hyundai Motor Group,17-5Mabuk-ro #240, Giheung-gu, Yongin-si,Gyeonggi-do, 446-716, Korea
Contents
I. Introduction1. Balance of Plant & Air Compressor 2. Selection of Air Compressor Type
II. Low Noise & High Performance Air Compressor1. Structure of Centrifugal Air Compressor2. Design Process of Air Compressor2. Design Process of Air Compressor3. Surge Margin improvement using CFD4. Rotor dynamic optimization techniques 5. Improvement of Structure Resonance6. Significant improvement in NVH performance
III. Conclusion
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ExhaustExhaust
Air intakeAir intake
Air Provide SystemAir Provide System
Humidifier
Balance of Plant & Air Compressor
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Water Pump
Thermal managementThermal managementRadiator
3-way Valve
H2 Tank
ExhaustExhaust
HydrogenHydrogenHydrogen SupplyHydrogen Supply
Fuel Cell Stack
Selection of Air Compressor Type
Ø Decision making - No oil mist*/High efficiency/Low noise & vibration/Low cost/Compact size
Type CentrifugalCentrifugal Displacement
Shape
* Oil mist contamination is a major cause of fuel cell degradation
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Shape
Oil mist X O O
Efficiency High Even Low
Cost/Size Good Bad Bad
Vibration/Noise Good Bad Bad
BLDC Motor-Rotor
BLDC Motor-Stator
Centrifugal compressor- Impeller
Structure of Centrifugal Air Compressor
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Inlet Duct
Centrifugal compressor- Volute
• Centrifugal compressor – compresses and pressurizes air, as per vehicle require• Brushless DC motor – converts electric energy into axial power for the compressor
ü Weight Reductionü Length Reductionü Increase Shaft Stiffness
Prototype Improved1st Mode 41,012RPM 45,672RPM
2nd Mode 89,000RPM 115,496RPM
[Critical Speed Map]
Improvement of Structure Resonance
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[Vibration Characteristic at Volute]
[Impact Test Result at Rear Support]
Significant improvement in NVH performance
1X
3X
[Proto Sample Noise]
StructureResonance
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[Test Bench & Setup for Noise Measurement][Improved Sample Noise]
[DER Noise Level in Vehicle][Noise Test in vehicle]
Conclusion
u Centrifugal type Air Compressor has advantage in- High Efficiency - Low Noise level
u Surge Margin improvement using CFD- Impeller Angle - Volute Development Angle
To meet MHG’s NVH level specifications, HVCC conduct
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u To meet MHG’s NVH level specifications, HVCC conduct- High Speed Motor Electro-magnetic field optimization - Rotor dynamic optimization techniques - Improvement of Structure Resonance