Experimental validation of a geometry model for twin screw machines

Buckney, David; Kovačević, Ahmed; Stošić, Nikola

doi:10.1533/9781782421702.4.237

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…The study also described a test case showing the effect of mesh refinement on performance prediction. As it is difficult to estimate the clearance changes during the operation, Buckney [3] developed and presented a procedure to enable a chamber model to predict the performance with consideration of rotor and casing expansion because of the thermal effects. Authors developed a simple way to estimate an operating clearance as a tool for determining the operating envelope of a certain screw compressor application.…”

Section: Literature Reviewmentioning

confidence: 99%

“…It is obvious that reducing the clearances in the twin-screw compressor results in the reduction of leakages and increase in the volumetric and adiabatic efficiencies. However manufacturing and assembly errors, rotor and casing deformation because of the thermal effects and rotor deflection during the operation becomes very important consideration for the safe operation of the compressor [2] [3]. The change in clearances during the operation influence the leakage and overall performance estimations, and that is the reason it is important to understand the operating clearances and their effect on the performance.…”

Section: Introductionmentioning

confidence: 99%

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Validation of Leakage Model for an Oil-free Twin-Screw Compressor

Patel¹,

Lakhera²,

Kovačević³

2023

Lecture Notes in Mechanical Engineering

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The performance of a twin-screw compressor is influenced by leakages, which are normally calculated using isentropic nozzle equations with flow coefficients. The changes in the clearances during operation necessarily require detailed studies for accurate leakage estimations. In this research, the flow coefficient correlations are derived for various shapes of leakage gaps using previous experimental results and regression analysis. They are integrated into SCORG (Screw Compressor Rotor Grid Generator) software to estimate leakages and performance of an oil-free twinscrew compressor. The results obtained from the proposed flow coefficients are firstly compared with the original inbuilt flow coefficients and experimental results of the same compressor for the designed assembly clearances. The clearances are then adjusted to approximate the operating clearances, and they are used for further investigation of the same compressor profile (different sizes) at various pressure and speed conditions. The findings indicate that the flow of the compressor using the new flow coefficients is greater than the flow estimation using the original flow coefficients, up to ~41%, ~31% and ~24% for three different sizes of compressors, each larger than the previous one. The total power consumption for all models in all sizes and operational circumstances is within 1% of the calculation with original clearances.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation of Leakage Model for an Oil-free Twin-Screw Compressor

Patel¹,

Lakhera²,

Kovačević³

2023

Lecture Notes in Mechanical Engineering

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Thermodynamic simulation and experimental validation of an oil-free twin-screw expander

Grieb

Brümmer²

2022

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

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The chamber model method is still a powerful tool for the thermodynamic simulation of screw machines and is widely used in the industry and in science. When choosing adequate submodels for the compressible flows through machine clearances and the machine ports high simulation accuracy can be reached with minimal computation resources. However, detailed modelling is required when the complex geometry of twin-screw machines is abstracted to a time-dependent zero-dimensional chamber model. In this paper a two-chamber model simulation tool is used for the thermodynamic simulation of an oil-free twin-screw expander operating with dry air as working fluid. Insights into the modelling process are presented and the importance of precise modelling of gap flows between adjacent capacities is discussed. The simulation results are finally validated against experimental data. Integral values obtained from the experiments, such as expander mass flow rate, indicated power, and effective power, are in good agreement with the numerical calculations. To gain a deeper understanding of the thermodynamics of the expander working cycle, additional investigations are carried out at zero speed. The mass flow rates measured for a variation of stationary rotor positions are compared to values calculated with the two-chamber model method.

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Experimental validation of a geometry model for twin screw machines

Cited by 2 publications

References 6 publications

Validation of Leakage Model for an Oil-free Twin-Screw Compressor

Validation of Leakage Model for an Oil-free Twin-Screw Compressor

Thermodynamic simulation and experimental validation of an oil-free twin-screw expander

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