Modelling of leakages in rotary twin-screw compressor

Patel, H. H.; Lakhera, Vikas J.

doi:10.1088/1757-899x/1070/1/012114

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…The test setup to simulate and determine the blowhole leakages experimentally is shown in figures 6 and 7 (Patel and Lakhera 2021). A 22 kW constant speed twin-screw compressor was used to generate compressed air at 7 bar pressure while the compressed air flow rate in the discharge line after discharge valve (in both with and without leakage conditions) was measured with the help of CAV (Critical Arc Venturi) nozzle (figure 8) as per ISO 1217(ISO 2009.…”

Section: Test Rig Descriptionmentioning

confidence: 99%

“…Figure 1 depicts the location of different leakage pathways while Figure 2 provides an overview of the various leakages in a twin-screw compressor (Patel and Lakhera 2021). Few commercially available simulation tools predict various leakages in addition to the performance prediction of twin-screw compressors, however the accuracy of these predictions depend on the grid quality of meshing the clearances.…”

Section: Introductionmentioning

confidence: 99%

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An experimental technique to simulate and measure leakages in twin-screw compressor

Patel

Lakhera

2021

Eng. Res. Express

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The phenomenon of leakages through various clearances in the twin-screw compressor and its accurate prediction affect its design and performance. The blowhole leakage within the twin-screw compressor is estimated by previous researchers using the convergent nozzle equation, which has certain idealized assumptions and hence has a scope of improvement considering the actual phenomena taking place within the screw compressor. The mathematical model presented in this study takes into account, the shape of a gap and its geometric dimensions, the parameters before and after the gap, the gas friction and the local resistance at entry and exit. An iterative model is used to calculate the leakage rate through the blowhole cross-sections at different pressure differences. The analytical results for the leakage using the mathematical models are verified experimentally by simulating the leakages through the circular cross section convergent nozzles of different sizes at different pressure differences. The experimental study along with analytical deduction suggests suitable multiplier to estimate the blowhole leakages within ±7.2%. This methodology may be extended to estimate the other types of leakages occurring dynamically within the screw compressor and fluid flow systems.

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Section: Test Rig Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An experimental technique to simulate and measure leakages in twin-screw compressor

Patel

Lakhera

2021

Eng. Res. Express

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show abstract

“…An experimental setup was used for simulating leakage flow and calculating the leakage rate through the blowhole clearance in a twin-screw compressor using an iterative approach [16,17]. The study carried out the experimental work with circular convergent nozzles (of equivalent area to the blowholes considered in the study), and the findings were compared with the analytical results.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations on Leakages in Positive Displacement Machines

Patel

Lakhera

2021

International Journal of Rotating Machinery

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The clearance gaps in positive displacement machines such as compressors, pumps, expanders, and turbines are critical for their performance and reliability. The leakage flow through these clearances influences the volumetric and adiabatic efficiencies of the machines. The extent of the leakage flow depends on the size and shape of clearance paths and pressure differences across these paths. Usually, the mass flow through the gaps is estimated using the isentropic nozzle equation with the flow coefficients applied to correct for the real flow conditions. However, the flow coefficients applied generally do not take into account the shape and size of these leakage paths. For that reason, a proper understanding of the relationship between flow coefficients and shape parameters is crucial for an accurate prediction of leakage flows. The present study investigates the influence of the various dimensionless parameters such as Reynolds number, Mach number, and pressure ratio on the flow coefficients for circular and rectangular clearance shapes. The flow coefficients are determined by comparing the experimental values obtained in an experimental test rig and the flow rates obtained from the isentropic nozzle equation. It is observed that in the case of circular clearances, the mean deviation of the experimental leakage results (in comparison to the analytical results using isotropic nozzle equations) is +9.1%, which is significantly lower than the mean deviation (+20.5%) in the case of rectangular clearance leakages. The study indicates that the isentropic nozzle equation method is more suitable for predicting the leakages through the circular clearances and needs modifications for consideration of the rectangular clearances. Using regression analysis, empirical correlations are developed to predict the flow coefficient in terms of Reynolds number, Mach number, pressure ratio, aspect ratio, and β ratio, which are found to match within ±6.4 percent of the numerical results for the rectangular clearance and within the range of -3.6 percent to +5.1 percent of the numerical result for the circular clearance. The empirical relationships presented in this study can be extended to evaluate the flow coefficients in a positive displacement machine.

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Parametric Analysis of a Screw Compressor :- A Critical Review

Valand¹,

Bhabhor²,

Jani³

et al. 2023

IJARSCT

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Rotary twin screw compressor are widely used in the refrigeration, gas processing and energy industries and their application are diverse. Flow rate, pressure, temperature and working fluid are all factors to consider for good screw compressor. Twin-screw compressor are generally simple and small in construction with improved dependability, due to a lower moving components. They are primarily classed as oil-free and oil-flooded, and owing to their low cost, they may be used to compress helium and other gases in addition to air. Twin screw compressor are replacing reciprocating compressor due to improved profile design. Because of technological advancements and continues improvement the industry’s necessity for exact performance projections has become a reality advances in the current analytical and simulation tools where appropriately can be proven by experimental investigation.

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Modelling of leakages in rotary twin-screw compressor

Cited by 3 publications

References 6 publications

An experimental technique to simulate and measure leakages in twin-screw compressor

An experimental technique to simulate and measure leakages in twin-screw compressor

Experimental Investigations on Leakages in Positive Displacement Machines

Parametric Analysis of a Screw Compressor :- A Critical Review

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