Abstract
Clearances between rotating and stationary parts in a screw compressor are set to ensure the efficient operation and allow for thermal deformation without unwanted contacts. The change in clearances is caused by both pressure and temperature changes within the machine. If clearances are too large, the increased leakage flows will reduce efficiency. However, if the nominal clearances are too small, contacts between the rotating and stationary parts can occur as a consequence of rotor and casing deformations. In order to determine the operational clearances, a numerical analysis of deformation of screw compressor rotors and casing has to be performed. This paper discusses how the temperature of rotor and casing surfaces calculated from the one-dimensional chamber model in the SCORG could be used as a boundary conditions for a steady state thermal and structural analysis of a screw compressor solid parts. Deformations of rotors and casing under temperature load were calculated using a commercial Finite Element Analysis code ANSYS. Operational clearance are estimated from these deformations and some recommendations for further work are proposed.
Highlights
This paper presents an integrated approach which uses results from the chamber model to calculate averaged temperatures of the rotors and casing which are used as a boundary conditions for the steady state numerical analysis of screw compressor rotors and casing deformation using commercial solver ANSYS in order to estimate change in clearances
In order to calculate the change in radial clearances between rotors and the casing it was necessary to link several calculation tools
The multi-chamber model built in SCORG program was used to obtain the average temperature on the surfaces of rotors and casing which are imported in ANSYS to calculate deformation of structural elements
Summary
This paper presents an integrated approach which uses results from the chamber model to calculate averaged temperatures of the rotors and casing which are used as a boundary conditions for the steady state numerical analysis of screw compressor rotors and casing deformation using commercial solver ANSYS in order to estimate change in clearances. For this analysis oil free screw compressor with 3-5 “N” rotors showed in Figure 2 is used
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