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Numerical investigation of pressure pulsation in oil-free twin screw compressor discharge systems adopted to oil and gas industry.

Number: 1321

Author(s) : BRAGA V., SILVA E., DUTRA T., CAETANO A., SILVA O., ANDREAZZA A.

Summary

Pressure pulsation within the discharge system of oil-free twin-screw compressors used in Vapor Recovery Units (VRUs) significantly impacts their reliability and the integrity of connected piping. This study investigates the dynamics of pressure pulsations in such compressors within the oil and gas industry, where reliable and robust operation is crucial. A Computational Fluid Dynamics (CFD) model was developed using ANSYS CFX coupled with SCORG mesh generation. Different discharge system configurations were investigated, including scenarios with the discharge port only, discharge port with a venturi pipe and a discharge port with a constant diameter pipe. Non-Reflective Boundary Conditions (NRBC) were adopted at the discharge outlet to minimize wave reflection. Findings revealed minor variations in both the P-𝛼 diagram and pulsation profiles among the configurations. Specifically, the use of a venturi pipe slightly elevated the peak pressure in the P-α diagram and increased the amplitude of discharge pressure pulsations. Additionally, the mass flow rate and indicated power showed negligible variation across the configurations, highlighting the limited impact of discharge system design on these performance metrics. Finally, a frequency domain analysis revealed the presence of the pocket passing frequency and no resonance effects due to different discharge configurations.

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  • Original title: Numerical investigation of pressure pulsation in oil-free twin screw compressor discharge systems adopted to oil and gas industry.
  • Record ID : 30033600
  • Languages: English
  • Subject: General information
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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