Optimisation of screw compressors

Stošić, Nikola; Smith, Ian K.; Kovačević, Ahmed

doi:10.1016/s1359-4311(03)00059-0

Cited by 77 publications

(35 citation statements)

References 7 publications

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“…More details of the design optimization are given in Stosic, Smith, and Kovacevic. 27 Experimental testing has been performed to determine the performance of this expander, which is discussed in the following section.…”

Section: Example Of Optimization Of the Rotor Profile Expander Desigmentioning

confidence: 99%

Optimization of Screw Expanders for Power Recovery From Low-Grade Heat Sources

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Stošić

Smith

2014

Energy Technology & Policy

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This is the published version of the paper.This version of the publication may differ from the final published version. Abstract: In systems for recovering power from low-grade heat sources, using twin screw machines to expand wet vapors, the power output depends on the conflicting requirements of high heat recovery and high working fluid temperatures, the dryness fraction of the fluid entering the expander, the rotor diameter and profile, the speed, and the built-in volume ratio. To obtain the best combination of these, for maximum power output per unit flow of a given heating medium, optimization methods and their associated numerical procedures can be used. This article focuses on the optimization of the geometry of a twin screw machine for the expansion of wet steam, with the aim of maximizing power output. Representative machine operating conditions are specified, and the methods used for the design of the machine are described. The predicted performance is compared with experimental data for the optimized machine, and close agreement is found between the predicted and measured results for power output, mass flow rate, and efficiency. Permanent repository link

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Section: Example Of Optimization Of the Rotor Profile Expander Desigmentioning

confidence: 99%

Optimization of Screw Expanders for Power Recovery From Low-Grade Heat Sources

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Stošić

Smith

2014

Energy Technology & Policy

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“…Despite the comprehensive experience gained in the field of screw machines the design of such a machine still represents a challenge [10]. The capability to analyse the performance of such complex screw machines is very 60 often limited by the thermodynamic models which describe the behaviour of the fluid or the inability to get proper experimental data.…”

Section: Introductionmentioning

confidence: 99%

New insights in twin screw expander performance for small scale ORC systems from 3D CFD analysis

Papeš

Degroote

Vierendeels

2015

Applied Thermal Engineering

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Twin screw expanders are widely used for power generation in small scale Organic Rankine Cycles (ORC). In order to increase the efficiency and maximize the generated power, an optimized design and appropriate operating conditions should be used. The use of Computational Fluid Dynamics (CFD) allows the analysis of the flow inside these machines which is impossible to investigate experimentally but which is influencing the performance of the expander. Some of the challenges when performing CFD analysis in these machines are the complexity of the rotors' motion and the properties of the refrigerant. In this paper a 3D CFD analysis of a twin screw expander is presented. The 3D blockstructured grid for the twin screw expander is constructed from the solution of Laplace problems in two-dimensional sections on an unstructured grid of the same geometry. During the transient calculations, grid nodes are moved while keeping the mesh topology. The properties of the refrigerant R245fa have been evaluated using the ideal gas Equation of State (EoS), the Aungier Redlich-Kwong EoS and the CoolProp. 3D CFD analysis of the screw expander showed that the difference in power output between the ideal gas EoS and the Aungier Redlich-Kwong EoS is 8% and between Aungier Redlich-Kwong EoS and CoolProp is negligible for operating conditions of interest. To investigate the performance of the expander, different pressure ratios and rotational speeds were studied for two different designs of the twin screw expander. The flow analysis inside the clearances that are forming leakage paths gives more insight in the performance of the expander. It is concluded that the biggest pressure drop is caused by a throttling loss at the inlet port and therefore an optimized design of the inlet port is necessary.

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“…There are a lot of rotor profile design methods. N. Stosic, et al [2] proposed an optimization method for screw compressor. He Xueming, et al [3] presented a positive and reverse design method of screw rotor profiles with freeform curves.…”

Section: Introductionmentioning

confidence: 99%

A Twin-Screw Rotor Profile Design Method Based on Computational Fluid Dynamics

Pan

et al. 2015

Lecture Notes in Electrical Engineering

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Abstract. Increasing demands for more efficient screw compressors design method to overcome the problems of rotor profile modification and compressor performance test establishment. A new method for the design of screw compressor shape, size and dimension is described here. As a result, NURBS curves and computational fluid dynamics (CFD) theory being applied to overcome these two problems. NURBS curves are introduced to construct a new rotor profile based on the rotor profile of unilateral asymmetric combined cycloid with pin gear arc. The numerical simulation models of the new profile and the original profile are built to find out the distribution law of pressure and velocity in twin-screw compressors under the operating speed by the means of FLUENT software. Finally, according to the simulation results, the rationality of the designed rotor profile is verified, and new schemes for further optimization are explored.

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Optimisation of screw compressors

Cited by 77 publications

References 7 publications

Optimization of Screw Expanders for Power Recovery From Low-Grade Heat Sources

Optimization of Screw Expanders for Power Recovery From Low-Grade Heat Sources

New insights in twin screw expander performance for small scale ORC systems from 3D CFD analysis

A Twin-Screw Rotor Profile Design Method Based on Computational Fluid Dynamics

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