Structured Mesh Generation and Numerical Analysis of a Scroll Expander in an Open-Source Environment

Ettore Fadiga, Nicola Casari, Alessio Suman and Michele Pinelli
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Ettore Fadiga: Department of Engineering (DE), University of Ferrara, 44122 Ferrara, Italy
Nicola Casari: Department of Engineering (DE), University of Ferrara, 44122 Ferrara, Italy
Alessio Suman: Department of Engineering (DE), University of Ferrara, 44122 Ferrara, Italy
Michele Pinelli: Department of Engineering (DE), University of Ferrara, 44122 Ferrara, Italy

Energies, 2020, vol. 13, issue 3, 1-13

Abstract: The spread of the organic rankine cycle applications has driven researchers and companies to focus on the improvement of their performance. In small to medium-sized plants, the expander is the component that has typically attracted the most attention. One of the most used types of machine in this scenario is the scroll. Among the other methods, numerical analyses have been increasingly exploited for the investigation of the machine’s behaviour. Nonetheless, there are major challenges for the successful application of computational fluid dynamics (CFD) to scrolls. Specifically, the dynamic mesh treatment required to capture the movement of working chambers and the nature of the expanding fluids require special care. In this work, a mesh generator for scroll machines is presented. Given few inputs, the software described provides the mesh and the nodal positions required for the evolution of the motion in a predefined mesh motion approach. The mesh generator is developed ad hoc for the coupling with the open-source CFD suite OpenFOAM. A full analysis is then carried out on a reverse-engineered commercial machine, including the refrigerant properties calculations via CoolProp. It is demonstrated that the proposed methodology allows for a fast simulation and achieves a good agreement with respect to former analyses.

Keywords: scroll; opensource CFD; OpenFOAM; CoolFOAM; WOM; positive displacement machine; expander; ORC (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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