A Review of Recent Research and Application Progress in Screw Machines

Abstract

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.

Numerical Investigation of an Oil-Free Liquid-Injected Screw Compressor with Ammonia-Water as Refrigerant for High Temperature Heat Pump Applications

“…In the intended operation of a compressor in the ACHP system, the compressor speed will vary depending on the required operating condition. As outlined in a review by Wang et al [18], investigations in the literature show that changes in speed affect the different performance parameters of the compressor. To gain a better understanding of the achievable performance parameters at varying operating points of the compressor, the influence of the operational frequency was investigated.…”

“…For the theoretical investigation, a variety of models with mostly numerical approaches were developed using different methods [17]. As reviewed by Wang et al [18], these range from quasi-one-dimensional models to more complex computational fluid dynamics (CFD) models with varying degrees of complexity by incorporating different assumptions (homogenous or heterogenous model, losses considered, etc.) and phenomena occurring (heat and mass transfer).…”

Parametric model analysis, geometrical characteristics and tool trajectories to surface roughness when machining the cycloid screw by a five-axis milling machine

“…The geometries of the screws will vary with the number of teeth and the size per shaft, along with the gear ratios and compression ratios with screw sets, however, the contact surfaces between the screws are always the same twisted surfaces with complex profiles. Machining _____________ 1 Faculty of Mechanical Engineering, Hanoi University of Industry, Hanoi city, Vietnam of screws is a complex process that always requires specialized tools and equipment [3][4][5]. These tools and equipment are often expensive, so in this study, the authors focused on the machining of screws on five-axis CNC milling machines and ball nose end mill tools common.…”