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Experimental investigation of the effect of oil injection flow rate on the performance of oil-injected twin-screw compressor.

Number: 1442

Author(s) : DUNDAGEKAR S., ABDAN S., MUNDE A., PATIL S., ASATI N.

Summary

One of the performance parameters to measure the efficiency of an oil-injected, twin-screw compressor is the volumetric efficiency and specific shaft power consumption. The volumetric efficiency is a measure of the fraction of theoretical volume flow delivered. The inefficiency in volume flow is observed because of the internal leakages during the compression of gas in the clearance gaps. These clearance gaps are maintained between the rotating elements and the rotating-stationary elements for assembly, operation, and reliability purposes. To compensate for the undesirable effect on volumetric efficiency because of relatively increased clearances, these clearance gaps can be filled with lubricating oil during operation. However, beyond a certain level of oil flow, the drag loss caused by the shearing of excess oil in the clearance gaps can lead to an increase in shaft power. So, a trade-off between higher volumetric efficiency and lower shaft power consumption needs to be investigated.
In this paper, an oil-injected, twin-screw air compressor used for a 75 kW input power is experimentally investigated to understand the effect of oil injection flow rate on the performance of the screw compressor. The oil injection flow rate, the compressor speed, and the discharge pressure are varied during the experimental investigation. To analyze the effect of these varied parameters on the performance, the compressor shaft power and volume flow rate are measured. The volumetric efficiency and compressor shaft power are calculated and plotted against injection oil flow, pressure ratio, and rotational speed. From the comparison, it is understood that with the increase in oil injection rate, the volumetric efficiency increases while the specific power consumption does not change much. The investigation confirms that an optimum oil injection rate is required for a particular operating condition, the rotational speed, and the pressure ratio. Although additional oil injection improves the volumetric efficiency, it adversely affects the shaft power.

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  • Original title: Experimental investigation of the effect of oil injection flow rate on the performance of oil-injected twin-screw compressor.
  • Record ID : 30030364
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15
  • Document available for consultation in the library of the IIR headquarters only.

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