Development of a Recuperator for 10kW micro gas turbine

Lakshminarayanan, R and Abdul, Nabi and Ramamurthy, S (2006) Development of a Recuperator for 10kW micro gas turbine. In: NCABE, December 2006.

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A 10kW Micro Gas Turbine (MGT) comprising of a radial turbine, a centrifugal compressor with reverse flow annular combustor coupled to an electric generator to produce power is under development and testing stage at the Propulsion Division, National Aerospace Laboratories, Bangalore. Also an annular reverse flow finned recuperator has been designed and fabricated for integration with the MGT to recover waste heat coming out of the radial turbine and to improve thermal the efficiency of the engine cycle. This paper covers the design, analysis, fabrication and testing of the recuperator, with the design objective of higher effectiveness and lower pressure loss. The annular recuperator with a plain surface has been designed and analyzed for stresses due to thermal and structural loads. A finite element commercial package (ANSYS) was used for modeling, meshing and analysis of recuperator geometry. The analysis indicate that stress levels are within yield the strength of material A test rig set up with compressed air lines and space heaters has been designed, fabricated and erected in the Propulsion Division for testing a sector test section model with alternate three air and four gas passages for experimental evaluation. Simulated engine design conditions such as flow, pressure and temperatures were applied and thermal effectiveness and pressure drop across the model are evaluated, validating the theoretical predictions. A full scale SS annular plain finned recuperator has also been fabricated for integration with the MGT. Various fabrication technologies such as spark EDM, wire EDM, Laser welding along with normal conventional machining processes were used in the fabrication and construction of the recuperator.

Item Type: Conference or Workshop Item (Lecture)
Subjects: AERONAUTICS > Aeronautics (General)
AERONAUTICS > Aircraft Propulsion and Power
Depositing User: Dr S Ramamurthy
Date Deposited: 13 Aug 2010 04:44
Last Modified: 13 Aug 2010 04:44

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