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High pressure ratio micro turbo alternator for UAV hybrid propulsion
Second stage axial turbine with high speed permanent magnet generator supported by foil bearing and ceramic ball bearing
We designed a motor driven PEM turbo charger (320,000rpm) with pressure ratio 2.5, 27g/s of air flow at 15,000ft altitude for fuel-cell based UAV APU.
Anode recirculation turbo blower for SOFC system (200,000rpm) uses bleed exhaust gas from the afterburner of SOFC system to drive radial turbine and blower. Very small portion of anode recirculation gas is cooled through external heat exchanger to lubricate the foil bearings, which are located in cold side.
Micro turbo blower (500,000rpm) for PEM fuel cells (1~2 kW) are also under development.
Motor driven PEM turbo charger
Anode recirculation turbo blower
Micro turbo blower
Novel cooling method of high speed electric motor for hybrid vehicles are being developed using two phase fluid.
Micro gas turbine integrated with residential boiler provides system efficiency as high as 85% (fuel to electricity and heat). In addition to on-site electrical power, high temperature exhaust gas from the micro gas turbine provides enough heat for residential heating and hot water. The system efficiency can be further improved by combining with micro ORC (Organic Rankine Cycles).
Core technology of oil-free turbomachinery is non-contact gas bearings. We are very specialized in design, prototyping and testing of advanced foil bearings with various sizes, from 5mm up to 200mm in diameter. Partnered with Bellkim Energy, LLC, University of Texas at Arlington developed the industry-leading foil bearings for the following applications.
High temperature coating
Gas turbine simulator rotor with foil bearings
Hybrid foil bearing with zero speed load capacity of 30psi (480lbf for 4” design and 1920 lbf for 8” design)
Novel radial bumps adopted to thrust foil bearings
Based on compliant foil bearing technology, unique compliant surface seal designs are also available with very small cross coupling stiffness and excellent sealing capability.
Double layer foil seal
Assembled foil seals
Example applied to axial stage