基于燃气发电机组的工作原理,难以用降低声源噪声的方法来消声,所以主要是要有效阻断其噪声传播途径。消声技术的核心就是利用声波在传播中自然衰减的规律去缩小噪声的污染面。具体降低噪声的方法有以下几种:

Based on the working principle of gas generator set, it is difficult to reduce the noise of sound source, so the main thing is to effectively block the noise transmission path. The core of noise elimination technology is to use the law of natural attenuation of sound waves in propagation to reduce the noise pollution surface. Specific noise reduction methods are as follows:

吸声、隔声及改变噪声传播方向。

Sound absorption, sound insulation and change of noise propagation direction.

在实际工程应用中往往只用其中一种,本文采用三种方法并用的措施,针对燃气发电机组提出了新型组合降噪技术。原来的消声器以阻性消声为主,功耗大,消声效果不理想。经仔细论证,应用三级组合降噪技术,将消声器改造为新型组合式消声器。

In practical engineering applications, only one of them is often used. In this paper, a new combined noise reduction technology for gas-fired generator units is proposed by using three methods. The original muffler mainly used resistive silencing, with high power consumption and unsatisfactory silencing effect. After careful demonstration, the muffler is transformed into a new type of combined muffler by using the three-stage combined noise reduction technology.

该组合式消声器的主要组成部件有对喷消声减振腔、多孔式消声罩及吸声隔热层和吸声共振板等。声源通过一级的对喷消声减振腔,可将中低频声源的噪声能量充分进行抗性耗散。

The main components of the combined muffler include a counter spray silencing and damping chamber, a porous silencing cover, a sound absorption and heat insulation layer, a sound absorption resonance plate, etc. The sound source can fully dissipate the noise energy of the medium and low frequency sound source through the first-class counter spray anechoic damping cavity.

改造规划

Renovation planning

根据燃气发电机组的作业原理,难以用下降声源噪声的方法来消声,所以首要是要有用阻断其噪声传达途径。消声技能的就是运用声波在传达中自然衰减的规则去缩小噪声的污染面。详细下降噪声的方法有以下几种:吸声、隔声及改动噪声传达方向。在实践工程运用中往往只用其间一种,针对燃气发电机组提出了新式组合降噪技能。

According to the operating principle of gas generator set, it is difficult to reduce the noise by reducing the noise source, so the first thing is to effectively block the noise transmission path. The center of silencing skill is to use the rule of natural attenuation of sound wave in transmission to reduce the pollution surface of noise. Detailed noise reduction methods include the following: sound absorption, sound insulation and changing the direction of noise transmission. In practical engineering application, only one of them is often used, and a new combined noise reduction skill is proposed for gas-fired generator sets.

消声排风道

Silencing exhaust duct

电扇噪声是由旋转噪声和涡流噪声组成。旋转噪声由旋转电扇叶片切开空气流发生周期性扰动而引起。涡流噪声是在旋转叶片截面上发生边界层别离时,气体滑脱或割裂而成的一系列的漩涡流,然后辐射出一种非安稳的活动噪声。

Fan noise is composed of rotating noise and eddy current noise. The rotating noise is caused by the periodic disturbance of the air flow through the blades of the rotating electric fan. Vortex noise is a series of vortex flows formed by gas slippage or splitting when boundary layer separation occurs on the section of rotating blade, and then radiates a kind of unstable moving noise.

排风道直接与外界相通,空气流速很大,气流噪声、电扇噪声和机械噪声经此通道辐射出去。为了操控电扇和排风通道的噪声,规划了一个消音排风道。这个消音排风道长度较大,由导风槽和排风降噪腔组成。排风降噪腔的作业原理,类似于阻性消声器。可经过替换吸音资料(改动资料的吸音系数),改动吸音资料厚度、排风通道长度和宽度等参数来提高消音效果。

The exhaust duct is directly connected with the outside world, and the air velocity is very large. The air flow noise, electric fan noise and mechanical noise are radiated through this channel. In order to control the noise of electric fan and exhaust duct, a silencing exhaust duct is planned. The silencing exhaust duct has a large length and is composed of an air guide slot and an exhaust noise reduction chamber. The operation principle of exhaust noise reduction chamber is similar to that of resistive muffler. The silencing effect can be improved by replacing the sound-absorbing data (changing the sound-absorbing coefficient of the data), changing the thickness of the sound-absorbing data, the length and width of the exhaust channel and other parameters.

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