NDLI: High Effectiveness, Low Pressure Drop Recuperator for High Speed and Power Oil-Free Turbogenerator

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Córdova, José Luis James, F. Walton Heshmat, Hooshang
Copyright Year	2015
Abstract	Development of a compact radial recuperator prototype for a previously demonstrated 8 kW turboalternator has been completed. Its novel geometry has resulted in measured heat transfer effectiveness that surpasses 90% at the operating conditions of the engine, with acceptable pressure penalty (< 35 kPa) that can be easily accommodated by the compressor. Unrecuperated, the oil-free, high-speed micro-turboalternator, operating at 180,000 rpm and featuring compliant-foil bearings, presented a thermal (or cycle) efficiency of 12%. With the recuperator, thermal efficiency of approximately 30% is possible. The recuperator configuration is unique from both a geometric and a heat transfer point of view. Its radial (axisymmetric) configuration allows for compact system integration, concentric to the existing engine/combustor hardware assembly. While the addition of the recuperator prototype has increased the overall weight of the system, and hence reduced its specific power from the previously reported 1.6 kW/kg (1 hp/lbm) to approximately 0.9 kW/kg, the unprecedented gain in efficiency by such a compact device justifies its implementation. Furthermore, it is anticipated that continuing prototype refinement, along with the use of novel manufacturing technologies and materials (e.g. 3D printing and ceramics) will result in a significant increase in power density. Performance characterization has been performed for mass flow rates up to 0.08 kg/s and gas inlet temperatures up to 925 K, which are representative of meso-scale turbine engines. Scalability of the device has also been evaluated, down to a 1 kW engine, and up to MW order.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856796
DOI	10.1115/GT2015-43718
Volume Number	Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines
Conference Proceedings	ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2015-06-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Power density Cycles Temperature Manufacturing technology Bearings Turbogenerators Compressors Additive manufacturing Ceramics Flow (dynamics) Pressure Engines Geometry Performance characterization Gas turbines Pressure drop Weight (mass) Hardware Manufacturing Thermal efficiency Combustion chambers Engineering prototypes Heat transfer
Content Type	Text
Resource Type	Article

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