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.

On gearing of helical screw compressor rotors

1998 ◽  
Vol 212 (7) ◽  
pp. 587-594 ◽  
Author(s):  
N Stošić
Keyword(s):  
Reverse Transformation ◽  
Screw Compressor ◽  
Helical Gears ◽  
Rotor Profile ◽  
Twin Screw

Twin-screw compressor rotors are effectively helical gears. When these are formed from a hobbing cutter, the hobbing tool and the rotor together constitute a pair of crossed helical gears. In the present paper, the envelope gearing method is used to derive a meshing condition for crossed helical gears which is then used to create the profile of a hobbing tool. A reverse transformation enables the rotor profile thereby manufactured to be calculated. Simplification of the main gearing condition leads to the meshing expression for helical gears which may be used for the design of screw compressor rotors.

A Study on the Influence of the Suction Arrangement on the Performance of Twin Screw Compressors

2013 ◽  
Author(s):  
Maria Pascu ◽  
Manoj Heiyanthuduwage ◽  
Sebastien Mounoury ◽  
Graeme Cook ◽  
Ahmed Kovacevic
Keyword(s):  
Screw Compressor ◽  
Complex Flow ◽  
Positive Displacement ◽  
Complex Shapes ◽  
Twin Screw ◽  
Profiling Techniques ◽  
Compressor Performance ◽  
Manufacturing Tolerances ◽  
Area Of Concern ◽  
Angle Of Rotation

Screw compressors are complex flow systems, but operate upon simple considerations: they are positive displacement machines consisting of meshing rotors contained in a casing to form a working chamber, whose volume depends only on the angle of rotation. Their performance is highly affected by leakages, which is dependent on various clearances and the pressure differences across these clearances. Nowadays, the manufacturing and profiling techniques have matured so much, that rotors of even the most complex shapes can be manufactured to tolerances in the order of few microns, resulting in high efficiencies. With manufacturing tolerances this tight, there is only small amount of improvement expected from further exploration of this venue, and a rather different direction for analysis may be more rewarding, i.e. other components of the screw compressor, like the suction and discharge areas. While the available literature includes several references on improvements of the compressor performance based on the analysis of the discharge port and discharge chamber, the investigation of the suction arrangement and inlet port remains fairly unexplored. This is the area of concern for the present paper, where the influence of the port shape and suction arrangement on the overall compressor performance is investigated. Two suction models were investigated for a standard screw compressor by means of CFD, which allowed in-depth analyses and flow visualizations, confirmed by the experimental investigation carried out on the actual compressor.

The Design of a Twin-screw Compressor Based on a New Rotor Profile

1997 ◽  
Vol 8 (4) ◽  
pp. 389-399 ◽  
Author(s):  
N. STOŠIĆ ◽  
I. K. SMITH ◽  
A. KOVAČEVIĆ ◽  
C. A. ALDIS
Keyword(s):  
Screw Compressor ◽  
Rotor Profile ◽  
Twin Screw

Development and Optimization of Screw Machines With a Simulation Model—Part II: Thermodynamic Performance Simulation and Design Optimization

1997 ◽  
Vol 119 (3) ◽  
pp. 664-670 ◽  
Author(s):  
K. Hanjalic´ ◽  
N. Stosˇic´
Keyword(s):  
Fluid Flow ◽  
Control Volume ◽  
Performance Simulation ◽  
Design Procedures ◽  
Rotor Profile ◽  
Screw Machine ◽  
Twin Screw ◽  
Fluid Properties ◽  
Screw Rotor ◽  
Tip Radius

This paper presents a method for the design of twin screw compressors and expanders, which is based on a differential algorithm for defining the rotor profile and an analytical model of the fluid flow and thermodynamic processes within the machine. Part I of the paper presents a method for screw rotor profile generation which simplifies and improves design procedures. An example is given of its use in the development of a new “N” rotor profile, which is shown to be superior to other well-known types. Part II describes a numerical model of the thermodynamic and fluid flow processes within screw machines, which is valid for both the compressor and expander modes of operation. It includes the use of the equations of conservation of mass and energy applied to an instantaneous control volume of trapped fluid within the machine with allowance for fluid leakage, oil or other fluid injection, heat transfer, and the assumption of real fluid properties. By simultaneous solution of these equations, pressure-volume diagrams may be derived of the entire compression or expansions, process within the machine. The procedure has been developed over a period of fifteen years and validated with experimental results obtained from both reciprocating and screw compressors and screw expanders, some of which are included. The rotor profile generation processor, thermofluid solver and optimizer, together with preprocessing facilities for the input data and graphical post-processing and CAD interface, have been incorporated into a design package which provided a suitable tool for analysis and optimization of twin screw machine design. An example of its use is given in the optimization of the gate tip radius of a selected compressor design.

scholarly journals A Review of Recent Research and Application Progress in Screw Machines

Machines ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 62
Author(s):  
Chuang Wang ◽  
Bingqi Wang ◽  
Mingkun Liu ◽  
Ziwen Xing
Keyword(s):  
Organic Rankine Cycle ◽  
Volume Ratio ◽  
Rankine Cycle ◽  
Thermodynamic Modelling ◽  
Future Research ◽  
Rotor Profile ◽  
Twin Screw ◽  
Compression And Expansion ◽  
Injection Technology ◽  
Air Compression

Screw machines, mainly including single-screw type and twin-screw type, have gone through significant development and improvement during the past decade. This paper reviews the relevant studies available in the open literature for acquiring insight into and to establish the state of the art of the research and application status of screw machines. The related research on different aspects, which would affect the performance and reliability of screw machines includes rotor profile and geometric characteristics, thermodynamic modelling, vibration and noise, lubrication and wear, control of capacity and built-in volume ratio, and liquid injection technology. In the aspect of thermodynamic modelling, the available methods, i.e., empirical or semi-empirical model, lump model, and 3D CFD model, adopted for the performance prediction and optimal design of screw machines are summarized. Then, the review covers the application status of screw machines in the fields of air compression and expansion, refrigeration and heat pump, organic Rankine cycle (ORC), and other popular applications, with an emphasis on the reported performance and progress in technologies of screw machines. Finally, conclusions and perspectives for future research in the area of screw machines are presented. The review provides readers with a good understanding of the research focus and progress in the field of screw machines.

scholarly journals Application of Path Homotopy in Twin Screw Compressor Rotor Profile Design

2021 ◽  
Vol 1180 (1) ◽  
pp. 012004
Author(s):  
Sumit Patil ◽  
Nikola Stosic ◽  
Ahmed Kovacevic ◽  
Ian Smith ◽  
Neeraj Asati
Keyword(s):  
Screw Compressor ◽  
Compressor Rotor ◽  
Rotor Profile ◽  
Twin Screw ◽  
Profile Design ◽  
Path Homotopy

Numerical Analysis for Twin Screw Pump Internal Flow

2011 ◽  
Vol 130-134 ◽  
pp. 3658-3663
Author(s):  
Qian Tang ◽  
Abebe Misganaw ◽  
Xian Zhi Ye ◽  
Yuan Xun Zhang
Keyword(s):  
Control Volume ◽  
Flow Analysis ◽  
Internal Flow ◽  
Numerical Control ◽  
Screw Pump ◽  
Steady State Condition ◽  
Various Boundary Conditions ◽  
Positive Displacement ◽  
Twin Screw ◽  
Displacement Pump

Screw pump is a special type of rotary positive displacement pump in which the flow through the pumping elements is truly axial. The objective of this study is to develop a numerical solution method for flow analysis of a twin screw pump by using a Single Rotating Reference Frame method with various boundary conditions and rotational speeds of rotor on steady state condition. Flow variable contours and plots were obtained for fluid flow inside a pump subject to pressure inlet and pressure outlet conditions using the numerical control volume method in the commercial package of FLUENT. This work needs for the analysis of flow parameters inside a screw pump in order to achieve optimum design.

Rotor Profile Generation Method for Twin Screw Compressors Based on Bi-Direction

2012 ◽  
Vol 229-231 ◽  
pp. 465-469
Author(s):  
Xue Ming He ◽  
Ming Han ◽  
Yang Deng ◽  
Yi Lu ◽  
Chen Liang Hua
Keyword(s):  
New Method ◽  
Reverse Direction ◽  
Screw Compressor ◽  
Key Technology ◽  
Rotor Profile ◽  
Twin Screw ◽  
Rotor Profiles

The performance of twin-screw compressor is mainly decided by profiles of the two rotors. The constitution of new rotor profiles is studied, meanwhile the key technology of generating rotor profiles are mainly studied in this paper. A new method based on forward and reverse direction for generating rotor profiles with meshing lines is proposed.

scholarly journals The Influence of Rotor Geometry on Power Transfer Between Rotors in Gerotor-Type Screw Compressors

2019 ◽  
Vol 142 (7) ◽  
Author(s):  
Matthew G. Read ◽  
Nikola Stosic ◽  
Ian K. Smith
Keyword(s):  
Performance Indicators ◽  
Input Power ◽  
Power Transfer ◽  
Multi Objective Optimization ◽  
Positive Displacement ◽  
Rotor Profile ◽  
Outer Rotor ◽  
Twin Screw ◽  
Wrap Angle ◽  
Swept Volume

Abstract The configuration of a twin-screw positive displacement machine is proposed, consisting of an internally geared outer rotor meshing with an externally geared inner rotor. Helical rotors with constant profile and pitch are used with parallel rotor axes and stationary end plates incorporating inlet and discharge ports to achieve internal compression or expansion. The focus of this paper is to understand the effect of rotor geometry on two key performance indicators; the swept volume of the machine and the proportion of input power transferred between the inner and outer rotors. This requires a detailed analysis of the limitations on rotor profile generation, the formation of working chambers, and the forces exerted on the rotors. The choice of the rotor for power transfer to or from the machine is shown to be an important consideration, and helical rotors are found to enable lower power transfer between rotors during operation when compared with straight-cut rotors, but with reduced swept volume for the same machine size. For particular applications, this compromise is characterized through multi-objective optimization of the rotor profile and wrap angle in order to identify appropriate configurations for the proposed machine.

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