| Summary: | 碩士 === 國立成功大學 === 機械工程學系 === 102 === This research presents the analysis and design of rotary-vane air motors having noncircular chamber profiles. Air motors produce very high specific power. They require compressed air rather than electricity; thus avoid sparks and can be used in demanding environments. Same as other types of rotary machines, air motors exhibit torque fluctuations. The varying torque curve is a result of unmatched torques generated by the vanes in one revolution. Torque fluctuations produce dynamic speed ripples that further introduce undesirable vibration. Rather than using auxiliary flywheels to smoothen the fluctuation, we use a new stator configuration that can help produce a nearly constant output torque. Meanwhile, the rotary-vane air motors can be more efficient by setting a reasonably higher expansion ratio for stator profile. A simulation model using FLUENT is also established to validate the result of analytical model. To validate the present designs, a new air motor is illustrated to show the speed ripples can be successfully reduced, while the efficiency can be increased. This research also presents the application of noncircular profile design in the field of air compressors, expect that the peak of driving torque can be reduced by using noncircular chamber profiles. Through this research, the noncircular profile design is expected to reduce energy wasting and costs.
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