Investigation of the influence of the number of vanes on the performance of a rotary vane compressor

Kotlov, A. A.; Kuznetsov, L. G.; Hrustalev, Boris

doi:10.1051/matecconf/201824504008

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…The experimental results from the study are compared with the analytical results (isentropic nozzle equations and an iterative method used by Kotlov et al (Kotlov et al 2018a;Kotlov et al 2018b) and are presented in the form of dimensionless numbers like the flow-coefficients, the Reynolds numbers and the pressure ratios. The flow coefficients derived for all the three plates (having rectangular clearances) with different pressure conditions and presented in this section.…”

Section: Resultsmentioning

confidence: 99%

“…Zakharenko (1965) and Sakun (1970) developed a mathematical model taking into consideration various factors such as the shape and geometrical dimensions of the gap, frictional forces in the gap, before and after flow parameters and local inlet and outlet pressure losses. Kotlov et al (2018a); Kotlov et al (2018b) used the same mathematical model (an iterative method) to find out the gas leakages from high-pressure cavities to the low-pressure cavities in the vane compressor and dry claw compressor. Kotlov et al (2018b) used the following equation to calculate the leakage flow rates through the gap at each fixed angle.…”

Section: Interlobe Clearance Leakages In Twin-screw Compressormentioning

confidence: 99%

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Prediction of Interlobe Leakages in Screw Compressors

2021

JAFM

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The clearance gaps in twin-screw compressors are critical for their performance and reliable operation, as the leakage flows through these clearances influence the volumetric and adiabatic efficiencies. The amount of leakage flows depends on the clearance size and shape as well as various geometric and operating parameters. Usually, the isentropic nozzle equations along with appropriate flow coefficients are used for more accurate estimation of the leakage flow rates through the clearance gaps. Hence, a proper understanding of the flow coefficients and their relationship with the dimensionless parameters (such as pressure ratio, Reynolds number, and aspect ratios) is critical for an accurate prediction of the leakage flows. In the present study, considering the interlobe clearance gap in screw compressor in terms of rectangular openings, the interlobe leakage flow rates are estimated for various opening sizes and pressure conditions using isentropic nozzle equations and an iterative method. The flow coefficients are determined by comparing the experimental values obtained using a specialized test rig and the flow rates obtained from the analytical methods. The dimensionless parameters are varied to see their individual effect on the leakage mass flow rates and on the flow coefficients. The mean deviation from the experimental results when using an analytical iterative procedure (-8.5%) is substantially lower in comparison to the mean deviation (+26.8%) using the isentropic nozzle equations. The study validates that the iterative method can be preferred (for an interlobe leakage flow rate prediction) over the isentropic nozzle equation method.

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Section: Resultsmentioning

confidence: 99%

Section: Interlobe Clearance Leakages In Twin-screw Compressormentioning

confidence: 99%

Prediction of Interlobe Leakages in Screw Compressors

2021

JAFM

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“…In order to estimate the leakage flow in positive displacement machines, apart from the various experimental and numerical studies, various analytical models have been used by researchers. Kotlov et al [5,6]…”

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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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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Investigation of the influence of the number of vanes on the performance of a rotary vane compressor

Cited by 3 publications

References 6 publications

Prediction of Interlobe Leakages in Screw Compressors

Prediction of Interlobe Leakages in Screw Compressors

Experimental Investigations on Leakages in Positive Displacement Machines

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

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