Two-stroke aero-engine composite silencer and application

Abstract

The invention provides a two-stroke aero-engine composite silencer and an application, and relates to the technical field of aircraft exhaust silencing. The exhaust noise of an engine can be effectively reduced. The silencer can keep smooth exhaust of the engine, reduce the airflow speed, reduce the exhaust back pressure and reduce the power loss of the engine. The silencer comprises a casing body. An exhaust inlet is formed in the first end face of the casing body, and an exhaust outlet is formed in the second end face of the casing body. Between the exhaust inlet and the exhaust outlet, a resistive noise reduction structure used for absorbing high-frequency-band noise, a Helmholtz silencing structure used for eliminating low-frequency-band noise, a gas flow dividing and hedging structureused for enabling gas flow to be reflected, interfered and hedged in the gas flow dividing and hedging structure so as to reduce flow speed, back pressure and noise, and a resistant silencing structure used for silencing the air flow again by utilizing a volume expansion principle are arranged in sequence. The technical scheme provided by the invention is suitable for the silencing process of theaircraft engine.

Description

【Technical field】 [0001] The invention relates to the technical field of aircraft exhaust silencing, in particular to a compound silencing device for a two-stroke aero-engine and its application. 【Background technique】 [0002] With the maturity of drone control technology, the application of drones is gradually expanding and popularizing, and the application occasions are various. It is very likely that there will be a situation where the flying population is concentrated. As the main noise reduction device, the muffler can block the propagation of sound waves and allow airflow to pass through. It is an effective tool for noise control. [0003] Traditionally, the exhaust silencing devices for internal combustion engines are mainly based on the principle of resistive silencing and resistive silencing, or combining the two into an impedance compound type. [0004] The resistant muffler is to set a sudden change interface or a resonant cavity next to the pipeline to reflect...

AI Technical Summary

Problems solved by technology

[0006] In the field of exhaust silencing of small and medium-sized UAVs, especially for aviation piston two-stroke engines, the exhaust airflow velocity is generally greater than that of four-stroke engines. Noisy, the noise reduction performance deteriorates, and at the same time, the regenerative noise inside the muffler and the exhaust back pressure also increase

In addition, the available space of the aircraft is limited, and it is impossible to use a larger space structure to decelerate the airflow, so it is more difficult to eliminate the low-frequency noise

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