| Summary: | 碩士 === 國立雲林科技大學 === 機械工程系碩士班 === 92 === The purpose of this study is to study the mass flow-rate characteristics through orifice-type restrictor with different diameter in aerostatic bearings by experimental and CFD approach. In the conventional design of gas-lubricated aerostatic bearings, the mass flow-rates of gas through different types of restrictors are all derived from a well-known mathematical model, which is originally developed to describe the mass flow-rate property through an ideal nozzle. It is reasonable to doubt if there is any difference between the properties of mass flow-rate through different restrictors in aerostatic bearings and that through a nozzle. In 1989, ISO6358 is defined as a standard to specify the method to determine the mass flow-rate for pneumatic components. It uses the “Sonic conductance C” and “Critical pressure ratio b” to describe the non-linear mass flow-rate. In this study, therefore, we plan to conduct a series of CFD simulations together with experiments according to ISO 6358. We successfully find the conductive value and the critical pressure ratio for orifice-type aerostatic bearing restrictor with different diameters.
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