航空發(fā)動機噪聲源分析及噴流噪聲抑制技術(shù)研究
[Abstract]:Noise is one of the key indexes of modern civil airliner design. The main sources of civil aircraft noise include airframe noise and engine noise. The engine noise level has been obviously reduced, but it is still one of the main noise sources of large civil aircraft. With the increasingly stringent noise requirements of aero-engines in the world, it is particularly important to control the noise of turbofan engines with large ducts. Therefore, the noise source analysis and jet noise suppression technology are studied for the aero-turbofan engine. In the aspect of noise source analysis, the noise sources of different parts of engine (including impeller noise, combustion noise and jet noise) are analyzed. Firstly, the noise of engine impeller is analyzed. The generation mechanism and types of fan noise are understood, and the main secondary noise in fan noise is distinguished. Secondly, the noise of engine combustor is analyzed. Because of the complexity of combustor noise, the mechanism of combustor noise and the influence factors of combustor noise are analyzed in this paper. Finally, the mechanism and characteristics of engine jet noise are introduced. In the aspect of noise suppression, according to the mechanism and characteristics of the above noise, several noise suppression techniques are analyzed. Firstly, four kinds of impeller noise suppression techniques are analyzed under the reference of existing literatures. It has a good effect on noise suppression, and the noise suppression technology of increasing transposon distance is built by Ansys software, and obtained by velocity cloud diagram and acoustic power cloud diagram, which can increase the transposon distance of 5mm. Noise can be reduced by about 4.2 dB; Secondly, due to the harsh environmental conditions of the aero-engine combustion chamber and the lack of research on the noise suppression technology of the combustion chamber, this paper analyzes the influence factors of the engine combustion chamber noise. Sound absorption technology is the most effective noise suppression method for combustion chamber at present. Finally, in the aspect of noise suppression technology of jet flow, this paper selects the noise-reducing technology of sawtooth nozzle, simulates and calculates an engine model by Ansys software, and obtains the temperature, velocity and noise distribution of jet flow. Through image analysis and comparison, it is concluded that the jagged tail nozzle can reduce the noise of jet from 4 to 5 dB, which proves the feasibility of the noise suppression technology of the jagged nozzle. In this paper, the influence of the number of jagged nozzle teeth on the effect of jet noise suppression is studied, and the results of optimizing the gear number are obtained.
【學(xué)位授予單位】:中國民航大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:V231.92
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