Basic Study on Engine with Scroll Compressor and Expander
نویسندگان
چکیده
Mitsuhiro Nishida Chief Engineer Fukuoka Works Mitsubishi Electric Fukuoka, JAPAN Scroll co1pressors are beco•ins popular in air conditionior and refrigeration. This is priurily due to their higher efficiency and Jo, noise/vibration characteristics. The scroll principle can be appi ied also to the stea• expander and the Brayton cycle engine, as shown in the past literature. The Otto cycle spark-lenition engine with a scroll co•pressor 11nd expander is studied in this report. The principle ond basic structure of the scroll entine are explained. and the enslne characteristics 11re calculated based on the idealized cycles and processes. A prototype 1odel hils been Proposed and constructed. The rotary type engine has always had a problem •ith sealing. The scroll engine might overco•e this shortco•inr Jith its .uch lower rubbinr speed co•Pared to its previous counterparts, and is therefore worth investigatin~. NOIENCLATURE a : radius of a base circle Cv: specific heat at constant volu•e F force h scroll height N nu~ber of scroll turns 1/4 p scroll Pitch P pressure q heat addition per unit 1ass r crank radius R0 : pressure ratio (after ignition/ before isnition) t : scroll wrap thickness T torque Y volume I work per revolution ~ involute initial ansle on the base circle Y specific heat ratio volumetric ratio efficiency rotating angle P pressure ratio ~ Involute extension ~ngle suffixes a : axial av: average c colpressor d discharge e expander i-th chamber (increase outward) s co•pressor suction 8 tansential end of co1pressor discharge process
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تاریخ انتشار 2014