Abstract: The definition of scroll compress profile rotation error sensitivity is put forward. According to the geometrical relation between profile rotation error sensitivity and radial mesh clearance, the computation method of radial mesh clearance under non-ideal state of orbit scroll rotation is provided. In addition the effects of profile type, profile normal angle and orbit scroll rotation angle on the radial mesh clearance are analyzed and then and example is given to show the result. On the basis of the profile type and the correlation between profile normal angle and orbit scroll rotation angle, not only a new reference index estimation profile performance is obtained but also the criterion foerror sensitivity region and blunt region is developed. According to this criterion, the assurance measurement for controlling profile error in the sensitive region is prsented. This measurement consequently plays a guiding role for reducing mesh clearance and enhancing the compressor seal.

Key words: Error, General profile, Mesh clearance, Scroll compressor