Shape optimization for flows of perfect and dense gases in turbine cascades has been achieved by means of a multi-objective genetic algorithm. For perfect gas flows, shape optimization allows efficiency improvements of about 3% over the baseline configuration. For dense gas flows, proper optimization starting from the same baseline geometry leads to efficiency gains up to 7%. Multipoint optimization allows improving performance over a large range of thermodynamic operating conditions. For the high cascade pressure ratio considered in this study, BZT effects play a minor role in efficiency improvement. The use of properly designed turbine cascades working with somewhat lower pressure ratios could allow higher efficiency improvements due to BZT effects, opening the door to the development of BZT turbines for Organic Rankine Cycles.
Shape optimization for dense gas flows in turbine cascades
CONGEDO, PIETRO MARCO;CINNELLA, Paola;
2009-01-01
Abstract
Shape optimization for flows of perfect and dense gases in turbine cascades has been achieved by means of a multi-objective genetic algorithm. For perfect gas flows, shape optimization allows efficiency improvements of about 3% over the baseline configuration. For dense gas flows, proper optimization starting from the same baseline geometry leads to efficiency gains up to 7%. Multipoint optimization allows improving performance over a large range of thermodynamic operating conditions. For the high cascade pressure ratio considered in this study, BZT effects play a minor role in efficiency improvement. The use of properly designed turbine cascades working with somewhat lower pressure ratios could allow higher efficiency improvements due to BZT effects, opening the door to the development of BZT turbines for Organic Rankine Cycles.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
