Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
3.2
Journals
Designs
Special Issues
Modelling, Analysis, and Design of Positive Displacement Machines: Papers Presented...
share announcement

Modelling, Analysis, and Design of Positive Displacement Machines: Papers Presented at the 4th Forum on CFD in Positive Displacement Machines

A special issue of Designs (ISSN 2411-9660). This special issue belongs to the section "Mechanical Engineering Design".

Deadline for manuscript submissions: closed (30 September 2019) | Viewed by 11847

Special Issue Editors

Prof. Ahmed Kovacevic

E-Mail Website
Guest Editor
School of Mathematics, Computer Science and Engineering, Department of Mechanical Engineering and Aeronautics, University of London, London EC1V 0HB, UK
Interests: Positive Displacement Machines; screw compressors and expanders; application of CFD and CCM to screw machines; methodology of engineering design; engineering design competences; research and development; new product development
Dr. Sham Rane

E-Mail Website
Guest Editor
Department of Engineering Science, University of Oxford, Oxford OX2 0ES, UK
Interests: computational fluid dynamics; deforming grid generation; CFD application to twin screw Positive Displacement Machines; rotary machines with phase change; two-phase expanders and turbines; fluid–solid interaction; multi-physics code coupling; computational analysis software development

Special Issue Information

Dear Colleagues,

Following the success of three previous forums/short courses on CFD in Positive Displacement Machines (PDM) held at City, University of London, in which there was strong participation from the compressor industry, CFD software providers, and academia, this Special Issue and the 4th short course (https://www.city.ac.uk/compressorsconference/short-course-on-compressors) are dedicated to advanced topics of modelling, analysis, and the design of Positive Displacement Machines for industrial and research use. The main topics include, but are not limited to the following:

  • Advances in grid generation, CFD tools, and new techniques for PD machine analysis.
  • Modelling of leakage flows and conjugate heat transfer.
  • Prediction of clearance gap sizes during operation and the application of modern FSI computations.
  • The stability and accuracy of multiphase flow calculations in PD machines.

Participants from academia and industry are invited to prepare journal publications with results from their research and analysis and present them in the forum.

This Special Issue and the short course/forum will be of interest to engineers; engineering managers and specialists from industry; students, researchers, and educators from academia; and anyone who is interested in modelling and design of rotary Positive Displacement Machines. It will be prepared and presented by leading scientists and researchers from industry and academia, and will provide insight into new technologies and the state of the art in modelling Positive Displacement Machines.

Prof. Dr. Ahmed Kovacevic
Dr. Sham Rane
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Designs is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Positive Displacement Machines
  • Modelling
  • Analysis
  • Design
  • Computational Fluid Dynamics
  • Multiphase Flows
  • Leakage Flows
  • Conjugate Heat Transfer
  • Fluid Solid Interaction

Published Papers (3 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

17 pages, 7432 KiB  
Article
Experimental and Numerical Investigation of Tip Leakage Flows in a Roots Blower
by Shuaihui Sun, Gursharanjit Singh, Ahmed Kovacevic and Christoph Bruecker
Designs 2020, 4(1), 3; https://doi.org/10.3390/designs4010003 - 06 Feb 2020
Cited by 10 | Viewed by 4213
Abstract
Computational fluid dynamics (CFD) can help in understanding the nature of leakage flow phenomena inside the rotary positive displacement machines (PDMs). However, due to the lack of experimental results, the analysis of leakage flows in rotary PDMs by CFD has not yet been [...] Read more.
Computational fluid dynamics (CFD) can help in understanding the nature of leakage flow phenomena inside the rotary positive displacement machines (PDMs). However, due to the lack of experimental results, the analysis of leakage flows in rotary PDMs by CFD has not yet been fully validated. Particle image velocimetry (PIV) tests with a microscopic lens and phase-lock were conducted to obtain the velocity field around the tip gap in an optical Roots blower. The three-dimensional unsteady CFD model of the Roots blower with the dynamic grids generated by Screw Compressor Rotor Grid Generation (SCORG) was established to predict the gap flow under the same operating conditions. The images obtained by the PIV tests were analyzed and some factors which compromise the quality of test results in the gap flow were identified, such as reflections and transparency of the window. The flow fields obtained by CFD have the same flow pattern and velocity magnitude as the experimental results in the majority of observed regions but overestimate the leakage flow velocity. The CFD results show a vortex induced by the leakage flow in the downstream region of the gap. The flow losses in the tip gap mainly happen at the entrance upstream of the gap. Finally, some suggestions for future work are discussed. Full article
(This article belongs to the Special Issue Modelling, Analysis, and Design of Positive Displacement Machines: Papers Presented at the 4th Forum on CFD in Positive Displacement Machines)
►▼ Show Figures

Figure 1

15 pages, 1341 KiB  
Article
CFD Simulations of Single- and Twin-Screw Machines with OpenFOAM
by Nicola Casari, Ettore Fadiga, Michele Pinelli, Alessio Suman and Davide Ziviani
Designs 2020, 4(1), 2; https://doi.org/10.3390/designs4010002 - 30 Jan 2020
Cited by 2 | Viewed by 3615
Abstract
Over the last decade, Computational Fluid Dynamics (CFD) has been increasingly applied for the design and analysis of positive displacement machines employed in vapor compression and power generation applications. Particularly, single-screw and twin-screw machines have received attention from the researchers, leading to the [...] Read more.
Over the last decade, Computational Fluid Dynamics (CFD) has been increasingly applied for the design and analysis of positive displacement machines employed in vapor compression and power generation applications. Particularly, single-screw and twin-screw machines have received attention from the researchers, leading to the development and application of increasingly efficient techniques for their numerical simulation. Modeling the operation of such machines including the dynamics of the compression (or expansion) process and the deforming working chambers is particularly challenging. The relative motion of the rotors and the variation of the gaps during machine operation are a few of the major numerical challenges towards the implementation of reliable CFD models. Moreover, evaluating the thermophysical properties of real gases represents an additional challenge to be addressed. Special care must be given to defining equation of states or generating tables and computing the thermodynamic properties. Among several CFD suite available, the open-source OpenFOAM tool OpenFOAM, is regarded as a reliable and accurate software for carrying out CFD analyses. In this paper, the dynamic meshing techniques available within the software as well as new libraries implemented for expanding the functionalities of the software are presented. The simulation of both a single-screw and a twin-screw machine is described and results are discussed. Specifically, for the single-screw expander case, the geometry will be released as open-access for the entire community. Besides, the real gas modeling possibilities implemented in the software will be described and the CoolProp thermophysical library integration will be presented. Full article
(This article belongs to the Special Issue Modelling, Analysis, and Design of Positive Displacement Machines: Papers Presented at the 4th Forum on CFD in Positive Displacement Machines)
►▼ Show Figures

Figure 1

16 pages, 3333 KiB  
Article
One-Dimensional Modelling of a Trilateral Flash Cycle System with Two-Phase Twin-Screw Expanders for Industrial Low-Grade Heat to Power Conversion
by Giuseppe Bianchi, Matteo Marchionni, Stuart Kennedy, Jeremy Miller and Savvas Tassou
Designs 2019, 3(3), 41; https://doi.org/10.3390/designs3030041 - 29 Jul 2019
Cited by 2 | Viewed by 3220
Abstract
This paper provides an overview of a one-dimensional modelling methodology for equipment and systems for heat to power conversion based on a staggered grid space discretization and implemented in the commercial software GT-SUITE®. Particular attention is given to a newly developed [...] Read more.
This paper provides an overview of a one-dimensional modelling methodology for equipment and systems for heat to power conversion based on a staggered grid space discretization and implemented in the commercial software GT-SUITE®. Particular attention is given to a newly developed modelling procedure for twin-screw machines that is based on a chamber modelling approach and considers leakage paths between cells and with the casing. This methodology is then applied to a low-grade heat to power conversion system based on a Trilateral Flash Cycle (TFC) equipped with two parallel two-phase twin-screw expanders and a control valve upstream of the machines to adapt the fluid quality for an optimal expander operation. The standalone expander model is used to generate performance maps of the machine, which serve as inputs for the TFC system model. Parametric analyses are eventually carried out to assess the impact of several operating parameters of the TFC unit on the recovered power and cycle thermal efficiency. The study shows that the most influencing factors on the TFC system’s performance are the inlet temperature of the heat source and the expander speed. While the first depends on the topping industrial process, the expander speed can be used to optimize and control the TFC system operation also in transient or off-design operating conditions. Full article
(This article belongs to the Special Issue Modelling, Analysis, and Design of Positive Displacement Machines: Papers Presented at the 4th Forum on CFD in Positive Displacement Machines)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-3
Back to TopTop