scholarly journals Multiphase Flow Analysis in an Oil-injected Twin Screw Compressor

2018 ◽  
Author(s):  
Nausheen Basha ◽  
Sham Rane ◽  
Ahmed Kovacevic
Keyword(s):  
Multiphase Flow ◽  
Flow Analysis ◽  
Screw Compressor ◽  
Twin Screw

scholarly journals Analysis of Oil-Injected Twin-Screw Compressor with Multiphase Flow Models

Designs ◽  
2019 ◽  
Vol 3 (4) ◽  
pp. 54 ◽  
Author(s):  
Nausheen Basha ◽  
Ahmed Kovacevic ◽  
Sham Rane
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Multiphase Flow ◽  
Oil And Gas ◽  
Industrial Applications ◽  
Screw Compressor ◽  
Oil Distribution ◽  
Depth Analysis ◽  
Twin Screw ◽  
Oil Injection

Growing demands for energy are motivating researchers to conduct in-depth analysis of positive displacement machines such as oil-injected screw compressors which are frequently used in industrial applications like refrigeration, oil and gas and air compression. The performance of these machines is strongly dependent on the oil injection. Optimisation of oil has a great energy saving potential by both increasing efficiency and reducing other impacts on the environment. Therefore, a three-dimensional, transient computational fluid dynamics study of oil injection in a twin-screw compressor is conducted in this research. This study explores pseudo single-fluid multiphase (SFM) models of VOF (Volume of Fluid) and a mixture for their capability to predict the performance of the oil-injected twin screw compressor and compare this with the experimental values. SCORGTM (Screw Compressor Rotor Grid Generator) is used to generate numerical grids for unstructured solver Fluent with the special interface developed to facilitate user defined nodal displacement (UDND). The performance predictions with both VOF and mixture models provide accurate values for power consumption and flow rates with low deviation between computational fluid dynamics (CFD) and the experiment at 6000 RPM and 7.0 bar discharge pressure. In addition, the study reflects on differences in predicting oil distribution with VOF, mixture and Eulerian-Eulerian two-fluid models. Overall, this study provides an insight into multiphase flow-modelling techniques available for oil-injected twin-screw compressors comprehensively accounting for the details of oil distribution in the compression chamber and integral compressor performance.

scholarly journals Grid Generation for CFD Analysis and Design of a Variety of Twin Screw Machines

Designs ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 30 ◽  
Author(s):  
Sham Rane ◽  
Ahmed Kovačević ◽  
Nikola Stošić
Keyword(s):  
Flow Analysis ◽  
Grid Generation ◽  
Cfd Modeling ◽  
Computational Grids ◽  
Screw Compressor ◽  
Analysis And Design ◽  
Positive Displacement ◽  
Compressor Rotor ◽  
Twin Screw ◽  
Dual Lead

A detailed study of the fluid flow and thermodynamic processes in positive displacement machines requires 3D CFD modeling in order to capture their real geometry, including leakage gaps. However, limitations in the conventional computational grids, used in commercial software packages, exclude their use for classical twin screw machines. The screw compressor rotor grid generator (SCORG) is a customized grid generation tool developed to overcome these limitations. This paper shows how it can be further extended to include non-conventional rotor designs, such as those with variable lead or profile variation and even internally geared machines with conical rotors. Other arrangements possible with this improvement include multiple gate rotors to increase volumetric displacement or dual lead, high wrap angle rotors for very high-pressure differences and vacuum applications. A case study of a water-injected twin screw compressor is included to demonstrate its use for both detailed flow analysis and design.

Integral Modeling of a Twin-Screw Compressor

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Sarah Van Erdeweghe ◽  
Joris De Schutter ◽  
Eric Van den Bulck
Keyword(s):  
Working Conditions ◽  
Control Volume ◽  
Optimization Procedure ◽  
Future Research ◽  
Screw Compressor ◽  
Positive Displacement ◽  
Rotor Profile ◽  
Twin Screw ◽  
Large Application ◽  
Similarity Law

In this paper, an integral methodology for the modeling of a twin-screw compressor is presented. Starting from a known rotor profile, all the algorithms to calculate the second rotor profile, the size of the control volume, and the compressor's performance are presented. The proposed modeling approach can be applied in an optimization procedure to find the optimal rotor profiles for a given application, with corresponding working conditions. Furthermore, based on the modeling results and substantiated with measurements on different compressor types, a similarity law for positive displacement compressors seems to exist. The existence of a similarity law has large application potential as it could be used to predict the performance of a positive displacement compressor in other than the (lab) tested working conditions. Further investigation of the similarity law for positive displacement compressors is therefore proposed as a key topic for future research.

An experimental technique to simulate and measure leakages in twin-screw compressor

2021 ◽  
Vol 3 (1) ◽  
pp. 015024
Author(s):  
Hitesh H Patel ◽  
Vikas J Lakhera
Keyword(s):  
Experimental Technique ◽  
Screw Compressor ◽  
Twin Screw

Engineered-airlift pumps for aquaculture applications using multiphase flow analysis

2019 ◽  
Vol 87 ◽  
pp. 101998 ◽  
Author(s):  
Mohammad Shallouf ◽  
Wael H. Ahmed ◽  
Sherif Abdou
Keyword(s):  
Multiphase Flow ◽  
Flow Analysis
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