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Title: Development and numerical modelling of a supercharging technique for positive displacement expanders
Authors: Bianchi, G
Fatigati, F
Cipollone, R
Keywords: Waste heat recovery;Organic Rankine Cycle;automotive;internal combustion engine;positive displacement expander;sliding vane expander
Issue Date: 2018
Publisher: Elsevier
Citation: Applied Thermal Engineering
Abstract: This research work presents a novel strategy to enhance the recovery performance of any positive displacement expander technology which aims at the maximization of the power output rather than the sole efficiency. The approach is based on an auxiliary injection of fluid at the same suction conditions of the main one and during the closed volume expansion phase. The operating principle of the supercharging technology is firstly outlined in theoretical terms, while the benefits over a conventional configuration are numerically assessed with reference to a sliding vane expander for applications based on Organic Rankine Cycles (ORC). The holistic modelling platform used for the benchmarking is preliminarily validated over an experimental campaign in which the vane expander was installed in a heavy-duty automotive ORC system and generated up to 1.9 kW (3% of the engine mechanical power) with an overall efficiency of 51.2%. After validating the simulation platform, the auxiliary intake line is parameterized in terms of four geometrical quantities and the effects of the supercharging with respect to baseline angular pressure trace are shown. An optimized design is eventually retrieved through an optimization based on a genetic algorithm and led to an average mechanical power increase of 50.6%.
ISSN: 1873-5606
Appears in Collections:Dept of Computer Science Research Papers

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