Calculation of clearances in twin screw compressors

International Conference on Compressors and their Systems 2019

Husak, Ermin^1 ; Kovacevic, Ahmed^2 ; Karabegovic, Isak^1

University of Bihac, Technical Faculty, Irfana Ljubijankia bb. 77 000, Bihac, Bosnia and Herzegovina^1

University of London, Department of Engineering, Centre for Compressor Technology, London, United Kingdom^2

关键词: Casing deformation;    Further works;    Pressure and temperature;    Screw compressors;    Stationary parts;    Temperature loads;    Thermal and structural analysis;    Thermal deformation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/604/1/012001/pdf
DOI  :  10.1088/1757-899X/604/1/012001

来源: IOP

【 摘 要 】

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.