Fluid-structure coupled analysis on clearance of oil-free twin screw blowers.

Number: 1280

Author(s) : ZHANG Y., WANG B., SUN S., PAN X., HE Z., XING Z.


With the development of modern industry, the requirement of high-pressure air without oil is becoming even more strict in many fields, such as food industry, sewage disposal, electroplating, etc. Due to the wide range of pressure and airflow with high efficiency, oil-free twin screw blowers become more favored in industrial applications, compared with centrifugal blowers and lobe blowers. For oil-free twin screw air blowers, clearance is a key factor affecting the performance. In practical applications, due to the difference between suction and discharge temperature, inhomogeneous thermal expansion can cause the rotors to rub or even get stuck. How to accurately design the clearance is an urgent problem to be solved. This paper presents a three-dimensional CFD simulation model of an oil-free twin screw air blower, in which gas flow with turbulence effects, heat transfer and leakage are taken into account. Pressure ratio varied from 1.5 to 2.2 with the flow rate from 44.11 m3/min to 40.53 m3/min when the rotation speed of the male rotor kept 4000rpm. The performance of the blower, such as power, volumetric efficiency and isentropic efficiency and the deformation of rotors and casing under unsteady temperature and pressure field are calculated. The results of fluid-structure coupled analysis can provide guidance on the design and optimization of the twin screw blower.

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  • Original title: Fluid-structure coupled analysis on clearance of oil-free twin screw blowers.
  • Record ID : 30028365
  • Languages: English
  • Subject: Technology
  • Source: 2021 Purdue Conferences. 25th International Compressor Engineering Conference at Purdue.
  • Publication date: 2021/05
  • Document available for consultation in the library of the IIR headquarters only.


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