Abstract: A profile modification method for perfect meshing of involute wrap of twin-scroll compressor is established. The generation and characteristics of this modified wrap, general mutual dependence of modification parameters of wrap head as well as equations of modification circular arcs are given. An accurate expression for calculating axial projective area of modified wrap is derived. A method for calculation of compression chamber volume in different angular positions of crankshaft is proposed. The influence of every modification parameters on performance of modified wrap such as compression ratio and strength etc, is also analyzed. The investigation results show that only the modification expanding angle f needs to be determined in order to obtain the shape of modified wrap head and the value of other modification parameters. When the value of f increases, the compression ratio decreases and the thickness of modified wrap head also increases, so that its strength increases, also.

Key words: Geometric theory, Perfect meshing profile modification, Scroll compressors, Twin-scroll profile, Adaptive Penalty Function, Efficient Global Optimization, Modeling, Multidisciplinary Design Optimization, Earth observation satellite