Synthesis and optimization for rotor profiles in twin rotor screw compressors

This paper proposes a systematic synthesis method for twin-screw rotor prof iles for compressors. Both ''original generating curves'' and "generated cu rves" are distributed on each rotor profile, and all the geometric paramete rs of these curves can be determined with satisfying the conditions of cont inuity in tangency by given only several specific parameter values. The con tact lines on rotor surfaces and the blowhole area calculation are also pre sented Three cases of optimization problems are shown in this paper and bot h contact-line length and blowhole area are reduced when letting the contac t-line length be the object function with a constraint of blowhole area.