Dynamics Analysis on the Triangular Rotary Engine Structures

[+] Author and Article Information
Chiu-Fan Hsieh

Department of Mechanical and Computer-Aided Engineering, National Formosa University, 64 Wunhua Road, Huwei, Yunlin, Taiwan

1Corresponding author.

ASME doi:10.1115/1.4039810 History: Received February 09, 2017; Revised March 07, 2018


A triangular rotary engine comprises an eccentric shaft, sun gears, triangular rotor, chamber, and apex seals. Using the epitrochoid and envelope principles, this study constructs mathematical models for the chamber and triangular rotor profiles of a rotary engine, as well as for the kinematics and contact force of its apex seals. The chamber profile is represented by the design parameter, trochoid ratio, whose limitations are investigated together with the volume ratio. To simplify the calculation, the dynamics analysis model ignores the effects of combustion and thermal conditions in rotary engines. Gas force effect is taken into account by first constructing a fluid analysis model that measures the gas fluid moment on the triangular rotor. Then, based on the mathematical of chamber and rotor models, a systematic dynamics analysis model for rotary engines is built that is not only capable of analyzing all engine components kinematics but also the stress variations. The dynamics model simultaneously considers both input torsion and fluid moment. The dynamics analysis then uses three trochoid ratios to illustrate the direct effects of chamber profile design on the system dynamics properties of rotary engines. The results not only show the dynamic properties and differences in varied mechanism designs of rotary engines, but also indicate the vibration and stress magnitude among components. The higher trochoid ratio with a larger variation in the chamber profile curvature reduces system stability and increase vibrations, stress fluctuations and large stress peaks risk.

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