Abstract
The initial development of oil-free screw compressors took place during the 1940s and 1950s. The research work carried out demonstrated that the compressor had a number of highly desirable features, many of which were not obtainable from existing compressor types. In addition, it was determined that the operating range of pressure and volume for which the compressor proved most suitable was effectively between the ranges of reciprocating and aerodynamic compressors. This paper discusses the principles used in designing a range of high-performance, oil-free screw compressors incorporating the knowledge learnt from earlier development work. The effect of operating conditions on performance is described and the limiting parameters identified. Certain effects of multi-staging are described, and a short description given of developments in screw compressors other than those that are oil free.
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