scholarly journals Research on Performance of Variable-Lead Rotor Twin Screw Compressor

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6970
Author(s):  
Huagen Wu ◽  
Jiankang Liu ◽  
Yuqi Shen ◽  
Mengtao Liang ◽  
Beiyu Zhang
Keyword(s):  
Volume Ratio ◽  
Screw Compressor ◽  
Core Component ◽  
The Core ◽  
Compressor Rotor ◽  
Twin Screw ◽  
Wrap Angle ◽  
Simulation Results ◽  
Internal Volume ◽  
Screw Rotors

Twin-screw compressors are widely used in aerodynamics, refrigeration and other fields. The screw rotors are the core component of the screw compressor and affect the performance of the compressor. This paper focuses on variable-lead rotors. A thermal process simulation model considering leakage is established to calculate the efficiency of the compressor. Different lead change methods are compared by evaluating the contact line, exhaust port and simulation results. The results show that the compressor obtains better performance when the lead decreases rapidly on the discharge side. Furthermore, the effects of the wrap angle and internal volume ratio on variable-lead rotors are studied. The work provides a reference for the design of the screw compressor rotor.

Key Technology of Form Grinding Wheel’s Axis Section’s Derivation

2013 ◽  
Vol 753-755 ◽  
pp. 1557-1561
Author(s):  
Ling Zhang ◽  
Bin Yao ◽  
Zhi Huang Shen ◽  
Wen Chang Zhao ◽  
Bin Zhou
Keyword(s):  
Research Method ◽  
Screw Compressor ◽  
Grinding Wheels ◽  
Relevant Research ◽  
Key Technology ◽  
Form Grinding ◽  
Key Technologies ◽  
Twin Screw ◽  
Screw Rotors ◽  
The Mathematical Model

Upon researching on the form grinding principle of rotor of the twin-screw compressor, firstly, this article gives the mathematical model of acquiring form grinding wheels axis section from screw rotors end section which is given by a series of discrete points. Then some key technologies to solve problems during the derivation of grinding wheels axis section and relevant research method to optimize the best setting angle have been analyzed. And last, the results of simulation and actual processing prove that this method is reliable and can meet the requirements of machining precision.

Dynamic Analysis for Rotors of a Twin-Screw Compressor with Gas-Induced Cyclic Loads

2015 ◽  
Vol 789-790 ◽  
pp. 220-225
Author(s):  
Yu Ren Wu ◽  
Van The Tran ◽  
Po Hua Hsu
Keyword(s):  
Multibody Dynamics ◽  
Noise Spectrum ◽  
Dynamics Simulation ◽  
Screw Compressor ◽  
Cyclic Loads ◽  
Frequency Domains ◽  
Dynamic Forces ◽  
New Strategy ◽  
Twin Screw ◽  
Screw Rotors

The effects of dynamic forces and elastic contacts in a pair of intermeshing rotors with the gas-induced cyclic loads based on the multibody dynamics simulation have not investigated yet. The comparison of numerical spectra of time and frequency domains of acceleration with the experimental noise spectrum of an oil-injected twin-screw compressor has not also considered. Therefore, this study proposes a new strategy, which combines the fluctuating torques and forces induced by cyclic gas pressure on the screw rotors to numerically predict vibration response in an oil-injected twin-screw compressor.

Precision Grinding Process Design of Twin-Screw Compressor Rotor

2013 ◽  
Vol 774-776 ◽  
pp. 1107-1111
Author(s):  
Yong Qiang Zhao ◽  
Sheng Dun Zhao ◽  
Hong Ling Hou
Keyword(s):  
Process Parameters ◽  
Grinding Wheel ◽  
Screw Compressor ◽  
Grinding Process ◽  
Compressor Rotor ◽  
Cnc Grinding ◽  
Twin Screw ◽  
Screw Rotor ◽  
Working Parameters ◽  
The Relationship

With the accuracy improvement of twin-screw compressor rotor machining, higher requirement of crew rotor grinded equipment and grinding process is put forward. Based the theory of screw grinding and CNC forming grinding wheel dress technology, the relationship between machine working parameters, CNC grinding wheel dressing parameters and screw rotor grinded process parameters are investigated, and the relationship between CNC grinding wheel dressing parameters and the screw rotor grinded process parameters is established, and its formulas are presented to describe the distances between grinding wheel axis and screw rotor axis. Through these formulas, the CNC wheel dressing program could be designed easily, the performance and efficiency of machine would be improved, and especially the machining quality of screw rotor would be enhanced and becomes more stability.

Solving the screw compressor rotor-forming grinding wheel using the edge detection method based on the graphic method

2019 ◽  
Vol 233 (5) ◽  
pp. 967-979 ◽  
Author(s):  
Jian Yang ◽  
Fang-Hong Sun ◽  
Zheng Lu
Keyword(s):  
Edge Detection ◽  
Detection Method ◽  
Grinding Wheel ◽  
Screw Compressor ◽  
Graphic Method ◽  
Grinding Wheels ◽  
Helical Surface ◽  
Compressor Rotor ◽  
Edge Detection Method ◽  
Screw Rotors

As a complex grinding wheel for special use, the screw compressor rotor-forming grinding wheel needs to be designed according to the specific profile of the workpiece. The design process is complicated and difficult to grasp, and various design issues are likely to occur. This study is based on the design theory of helical rotor-forming grinding wheels. Here, disc-shaped forming grinding wheels for machining a helical surface were studied, with discrete point workpiece cross-sections as examples. MATLAB was used as the development tool, and the Unigraphics motion simulation function was applied to establish a 3D model of screw rotors and design the forming grinding wheel for machining the helical surface. Additionally, the edge shape of the grinding wheel obtained with the analytical method and the edge shape obtained with the edge detection method based on the graphic method and the alpha-shape algorithm were compared. The results of this comparison show that the edge shape of the grinding wheel obtained by the edge detection method had high precision and was easy to solve. This method can also be used for the design of other similar conjugated products such as gears, worms, and grinding wheels. The research findings provide important reference value for the design and machining of screw rotors and grinding wheels.

scholarly journals Structural characteristics of twin-screw compressor rotor based on thermal-solid coupling method

2020 ◽  
Vol 22 (6) ◽  
pp. 1534-1546
Author(s):  
Junli Wang ◽  
Tuolei Li ◽  
Shuai Lei ◽  
Wensheng Zhang ◽  
Zhigui Ren
Keyword(s):  
Structural Characteristics ◽  
Coupling Method ◽  
Screw Compressor ◽  
Compressor Rotor ◽  
Twin Screw

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

scholarly journals Influence of rotor geometry on tip leakage and port flow areas in gerotor-type twin screw compressors

2020 ◽  
pp. 095440892096241
Author(s):  
MG Read ◽  
IK Smith ◽  
N Stosic
Keyword(s):  
Geometric Analysis ◽  
Contact Forces ◽  
Screw Compressor ◽  
Continuous Contact ◽  
Tip Leakage ◽  
Positive Displacement ◽  
Compression Cycle ◽  
Twin Screw ◽  
Wrap Angle ◽  
Port Areas

Conventional twin-screw compressors are positive displacement machines that form working chambers between two helical, parallel rotors and an outer casing. This study investigates an alternative configuration of rotors for compressor applications, in which the working chambers are formed by continuous contact between meshing inner an outer rotors. This is a similar configuration to gerotor machines, which are commonly used in fuel and oil pumping applications and as hydraulic motors. For compressor applications, the use of helical rotors with appropriate porting in a gerotor-type configuration has been identified as having potentially lower rotor contact forces and larger port areas than occur with non-helical rotors. This study investigates how key performance parameters of a gerotor-type screw compressor (volume, port flow areas and tip leakage areas) are influenced by the profile, dimensions and wrap angle of the rotors. The results of this geometric analysis are compared with a conventional twin-screw compressor, and suggest that the gerotor-type screw compressor can achieve higher axial port areas and lower tip leakage area over most of the compression cycle.

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.

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