Analysis of performance of two-stage screw compressor under various operating conditions

Liu, Guangbin; Yang, Qinwen; Zhao, Yuanyang; Wang, Le; Li, Liansheng

doi:10.1177/0957650916659578

Cited by 6 publications

(8 citation statements)

References 16 publications

(18 reference statements)

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“…As shown in Figure 4, the lump model is to describe thermophysical properties of fluids in the control volume in terms of rotating angle by developing differential control equations based on mass and energy conservation. Usually, there are two options of the lump model: m-u model [55][56][57][58][59] and p-T model [17,29,[60][61][62][63]. The former is simpler in equation structures, while the latter consumes less time.…”

Section: Lump Modelmentioning

confidence: 99%

“…Leakage is one of the key factors influencing the working process, and mainly affects the volumetric flow rate and volumetric efficiency of screw machines. There are several available leakage models used in the lump model: isentropic nozzle flow [29,55,56,60,61,63,64], orifice flow [17,55,58,61], Lin formula [14,17,55,62,65], uncompressible gap flow [14,65], incompressible and viscous pipe flow [62], adiabatic Fanno flow [59], and one-dimensional steady-state laminar flow [55,57]. Most researchers adopted the same leakage to calculate the flow rate of all leakage paths [17,29,[56][57][58]60,61,63,64], while others adopted different leakage models for different leakage paths considering the different flow states of fluids and the shape of leakage paths [14,55,62,65].…”

Section: Lump Modelmentioning

confidence: 99%

“…There are several available leakage models used in the lump model: isentropic nozzle flow [29,55,56,60,61,63,64], orifice flow [17,55,58,61], Lin formula [14,17,55,62,65], uncompressible gap flow [14,65], incompressible and viscous pipe flow [62], adiabatic Fanno flow [59], and one-dimensional steady-state laminar flow [55,57]. Most researchers adopted the same leakage to calculate the flow rate of all leakage paths [17,29,[56][57][58]60,61,63,64], while others adopted different leakage models for different leakage paths considering the different flow states of fluids and the shape of leakage paths [14,55,62,65]. The flow through the suction and discharge port of screw machines can also be regarded as a kind of leakage in the modelling process, and thus its flow rate can also be calculated by the same leakage models.…”

Section: Lump Modelmentioning

confidence: 99%

See 2 more Smart Citations

A Review of Recent Research and Application Progress in Screw Machines

Wang

Liu

et al. 2022

Machines

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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.

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Section: Lump Modelmentioning

confidence: 99%

Section: Lump Modelmentioning

confidence: 99%

Section: Lump Modelmentioning

confidence: 99%

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A Review of Recent Research and Application Progress in Screw Machines

Wang

Liu

et al. 2022

Machines

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“…A reduction in power consumption could be achieved by optimizing the intermediate pressure. Liu et al [16] investigated the performance of a two-stage oil-free screw compressor under various operating conditions with a mathematical model. The results showed that the volumetric and indicated efficiency of the second stage is more sensitive to the operating condition than that of the first stage.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on influence of interstage oil injection in a dual-motor-driven two-stage screw air compressor

Liao

Wang

Yuan

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Energy saving for compressed air production is of great importance all over the world due to its great energy cost and the indispensable utility of compressed air in the industrial sector. In recent years, oil-injected two-stage screw air compressors, especially driven by dual motors, are becoming a promising alternative to other compression equipment for their extraordinary efficiency and high reliability in a wide range of applications. However, two-stage screw air compressors have a different and complicated oil injection system compared with single-stage compressors. And an appropriate setting of oil injection parameters might result in a considerable performance improvement of the compressor. In this paper, a dual-motor-driven two-stage oil-injected screw compressor was tested under the actual service conditions and control modes experimentally. The effect of interstage oil injection on the compressor performance was studied in detail by varying the interstage oil injection flow rate and rotating speed. The performance parameters such as specific power, volumetric efficiency and adiabatic efficiency were calculated from the measured data. The results indicate that an excess amount of oil exists in the second stage compressor and reducing the oil moderately could decrease the power consumption of the two-stage air compressor unit.

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“…A relatively large clearance results in a reduced pump efficiency because there is a significant flow leakage. 1–3 It is physically difficult to measure the clearance distribution along a contact line between two engaged screw rotors. Therefore, the clearance estimation is a commonly studied issue to enhance the machining accuracy and improve the pump performance.…”

Section: Introductionmentioning

confidence: 99%

Inter-lobe clearance estimation for twin-screw rotor pairs with point-meshing features

Hoang

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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In practical production, it is impossible even to measure the inter-lobe (meshing) clearance of a screw rotor pair. However, understanding of the clearance distribution is essential since it is a major leakage path which greatly affects the twin-screw pump performance. Previous publications did not disclose explicit detail on how to calculate the meshing clearance for screw rotor pairs with point-meshing features. Therefore, this study proposes a meshing clearance calculation method for screw rotor pairs with point-meshing features. The complex meshing clearance can be simply determined by calculating the shortest distance between two normal-rack profiles generated using point-enveloping principle. Clearance distributions are much more intelligible to be exhibited on a 3-D contact line and the rotor profile. Due to its immeasurability in practice, the adaptability and the solution accuracy of the proposed numerical method are verified by applications on different rotor profiles and comparisons with measured results from a 3-D CAD model. The meshing clearance in a variable-pitch screw rotor pair and the clearance adjustability are also illustrated through the proposed examples.

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Analysis of performance of two-stage screw compressor under various operating conditions

Cited by 6 publications

References 16 publications

A Review of Recent Research and Application Progress in Screw Machines

A Review of Recent Research and Application Progress in Screw Machines

Experimental research on influence of interstage oil injection in a dual-motor-driven two-stage screw air compressor

Inter-lobe clearance estimation for twin-screw rotor pairs with point-meshing features

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