Exhaust gas emission method of engine adopting push-back propeller

Abstract

The invention discloses an exhaust gas emission method of an engine adopting a push-back propeller. Exhaust gas discharged from an engine exhaust gas emission pipe is discharged to the side, not closeto the engine, of the propeller through a gas guide device. The waste gas does not make contact with the propeller in the emission process. Different from a traditional engine exhaust gas direct emission manner, the exhaust gas emission method of the engine adopting the push-back propeller directly discharges the engine exhaust gas to the back side of the propeller through a gas guide ring pipe,so that the surfaces of blades of the propeller cannot be polluted. The exhaust gas emission pipe is not exposed outside the engine body in the manner that the gas guide pipe directly extends into thegas guide ring pipe at the root portion of the blades. The exhaust gas is directly discharged out from the back side of the propeller, so that the engine body, the blades and other components cannotbe polluted.

Description

technical field [0001] The invention relates to an aircraft power system, in particular to an engine exhaust method for a pushback propeller. Background technique [0002] Piston-type aeroengine is a reciprocating internal combustion engine that provides flight power for aircraft. The principle of the engine is to drive propellers such as air propellers to rotate to generate propulsion. Aviation piston engines are widely used in small and medium-sized unmanned aerial vehicles, trainer aircraft and other aviation vehicles due to their low fuel consumption, light weight and wide power range. [0003] Existing push-back piston-type aero-engines mostly use downward exhaust pipes, and the exhaust pipes are located in front of the propellers. In order to prevent the exhaust pipe waste gas from polluting the body, the exhaust pipes generally extend a certain distance. Although the exhaust design of this push-back propeller piston engine avoids pollution to the airframe itself, it ...

AI Technical Summary

Problems solved by technology

[0004] First: Since the propeller of the push-back power design is located behind the engine, and the diameter of the blade is large, it is difficult for the waste gas discharged from the exhaust pipe to avoid the blade, and the waste gas discharged from the exhaust pipe pollutes the propeller and adheres to the blade surface, reducing propeller performance;

[0005] Second: Since the exhaust pipe extends downward or sideways for a certain distance, directly exposing the fuselage, the windward area increases and the resistance increases;

[0006] Third: The waste residue discharged from the exhaust pipe is attached to the propeller and the body, etc. After each flight, it needs to be carefully wiped and cleaned, and the later maintenance is more cumbersome;

[0007] Fourth: The surface of the propeller blades is covered with a large amount of waste residue, which reduces the propulsion efficiency of the propeller, and the exposed exhaust pipe increases the flight resistance, all of which increase the fuel consumption rate of the aircraft during cruising and reduce the cruising time

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