What is the working principle of a rotary engine?

[McGriffin]

Working principle of a rotary engine: The rotary engine directly converts the combustion expansion force of combustible gas into driving torque. Compared with reciprocating engines, the rotary engine eliminates useless linear motion, resulting in a smaller size, lighter weight, and lower vibration and noise for the same power output, giving it significant advantages. Conventional engines are reciprocating engines, where pistons move back and forth in a straight line within the cylinders. To convert this linear motion into rotational motion, a crankshaft-slider mechanism is required. In contrast, the rotary engine uses a triangular rotor's rotational motion to control compression and exhaust, which differs significantly from the linear motion of traditional reciprocating piston engines.