Male and female rotors of a screw compressor theoretically contact each other on a sealing line. However, there is a clearance distribution along to this sealing line between real rotors. As this clearance influences the compressor's efficiency and reliability, it is important to control the clearance. The amount of clearance depends on profile error, thermal deformation, centre displacement and relative rotational angle between rotors. An easy and fast method for calculating the clearance distribution by using geometrical approximation and simplification is proposed. As an evaluation and feedback tool, this method will help to determine profile modification to tolerate errors or displacement.
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