18 At the beginning of the century, Watt's steam engine showed the world an unprecedented power device, making the world realize that there are other power driving methods besides manpower, animal power, water power, and wind power. In the following hundreds of years, humans began to endlessly explore power machines. After hundreds of years of development, automobile engine technology has become mature and stable, and has conquered one power and torque mark after another. Car Power machine The enthusiasm gradually subsided, but people are always not "obedient", and the blood that has nowhere to be spilled makes us turn our eyes to the blue sky above our heads. The internal combustion piston engine has achieved great success on the road, and people thought of applying it to airplanes as the power source for airplane flight.

The working principle of the piston engine is Car basically the same as that of an internal combustion piston engine. But relative to Car Power machine the working environment is worse, the power-to-weight ratio is higher, and the coordination requirements between major system institutions are stricter. The ambient temperature of the high-altitude aviation piston engine is low, and the oxygen content is low, but the high-power requirement makes the heat generated during operation far higher than Car Power machine making the flight Power machine more reliable gas distribution mechanism and cooling system. Flight Power machine The takeoff and cruise power requirements of are several times higher than ordinary Car Power machine or even higher. The normal working state during cruise is 60% above the maximum speed, and the working state during takeoff is close to the maximum speed, which requires Power machine The connection and coordination of all institutions and systems in cannot have any errors. Flight Power machine The power-to-weight ratio is also an important standard. Compared with Car Power machine compared to Flight Power machine also needs to overcome the influence of gravity. Under the same constant power, Power machine The lighter it is, the better it carries the aircraft. Therefore, the weight reduction of the whole should be considered during development, and the materials used are changed from cast iron to aluminum alloy, titanium alloy and other lightweight, high-temperature resistant, and high-strength materials. In addition, Flight Power machine The internal of is Flight Power machine more precise and complex than that of a car. Power machine The dimensional tolerances of the combustion chamber, intake port, exhaust port, piston, propeller, and even Power machine each bolt must be strictly guaranteed. The casting, processing, assembly, and quality tracking of parts, as well as the quality management of individual parts, must be accurately controllable.

Piston engines are mainly used in small and light aircraft. Although they are not as powerful as the gas turbines on large civil aircraft, Power machine but they have many advantages that turbine Power machine cannot replace. For turbine Power machine The cost of providing strong thrust is high fuel consumption, which generally reaches full power at startup 80% about. And turbine Power machine The response mechanism is poor, and it takes a long time from startup to aircraft takeoff. Piston engines consume less fuel, can provide good power for the aircraft, and have less noise compared to turbine Power machine 。