Comparison of two types of twin-rotor piston engine mechanisms

Preliminary explorations of the performance of a novel small scale opposed rotary piston engine

“…This rotary piston engines inherited Wankel engines' merits including the potentials of less wear and quenching effect. Other novel designs, such as Deng et al [32] invented a twin-rotor piston engine, which had a high power density and no complex valve mechanism. The configurations and working principles of the rotary piston engine were analysed, additionally, the piston velocity and acceleration during movements were investigated.…”

Intake characteristics and pumping loss in the intake stroke of a novel small scale opposed rotary piston engine

“…In the protype, the end faces of the pistons are flat, which leads to a small range of spark timing, which provides a small potential of improving brake thermal efficiency and decreasing exhaust emissions by adjusting sparking timing under different operating conditions (Duan et al, 2019;Li et al, 2019;Zhu et al, 2018). Other researches of the ORP engines, such as the work (Deng et al, 2013) investigated the piston velocity and acceleration in the engine operating process using a mathematical method, and the authors (Deng et al, 2013) hold the opinion that the power density of the ORP engine increases with piston numbers under the conditions of same engine size. However, this opinion neglects the effect of intake duration on charging efficiency which dominates the engine power output.…”

The Potential of Wobble Plate Opposed Piston Axial Engines for Increased Efficiency

“…The undoubted advantages of these engines include a compact design, barrel shape, and a significantly limited number of parts (no complicated timing system). One of the latest constructions of this type is the twin rotor piston engine, design of which is described in the publication [9]. The engine works on the principle of cooperation between quadrant vane pistons mounted on two oscillating rotors.…”

“…It has been noted that this engine has a number of power strokes equal to the square of the number of vanes on each rotor. For the design presented in [9] with six pistons on one rotor, the engine will work with 36 power strokes per revolution. Rotary engines have unfortunately some fundamental disadvantages, such as the shape of the combustion chambers with a low volume to surface ratio which causes greater heat loss.…”