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

在實(shí)際工程應(yīng)用中往往只用其中一種,本文采用三種方法并用的措施,針對(duì)燃?xì)獍l(fā)電機(jī)組提出了新型組合降噪技術(shù)。原來的消聲器以阻性消聲為主,功耗大,消聲效果不理想。經(jīng)仔細(xì)論證,應(yīng)用三級(jí)組合降噪技術(shù),將消聲器改造為新型組合式消聲器。

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.

該組合式消聲器的主要組成部件有對(duì)噴消聲減振腔、多孔式消聲罩及吸聲隔熱層和吸聲共振板等。聲源通過一級(jí)的對(duì)噴消聲減振腔,可將中低頻聲源的噪聲能量充分進(jìn)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.

改造規(guī)劃

Renovation planning

根據(jù)燃?xì)獍l(fā)電機(jī)組的作業(yè)原理,難以用下降聲源噪聲的方法來消聲,所以首要是要有用阻斷其噪聲傳達(dá)途徑。消聲技能的就是運(yùn)用聲波在傳達(dá)中自然衰減的規(guī)則去縮小噪聲的污染面。詳細(xì)下降噪聲的方法有以下幾種:吸聲、隔聲及改動(dòng)噪聲傳達(dá)方向。在實(shí)踐工程運(yùn)用中往往只用其間一種,針對(duì)燃?xì)獍l(fā)電機(jī)組提出了新式組合降噪技能。

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.

消聲排風(fēng)道

Silencing exhaust duct

電扇噪聲是由旋轉(zhuǎn)噪聲和渦流噪聲組成。旋轉(zhuǎn)噪聲由旋轉(zhuǎn)電扇葉片切開空氣流發(fā)生周期性擾動(dòng)而引起。渦流噪聲是在旋轉(zhuǎn)葉片截面上發(fā)生邊界層別離時(shí),氣體滑脫或割裂而成的一系列的漩渦流,然后輻射出一種非安穩(wěn)的活動(dòng)噪聲。

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.

排風(fēng)道直接與外界相通,空氣流速很大,氣流噪聲、電扇噪聲和機(jī)械噪聲經(jīng)此通道輻射出去。為了操控電扇和排風(fēng)通道的噪聲,規(guī)劃了一個(gè)消音排風(fēng)道。這個(gè)消音排風(fēng)道長(zhǎng)度較大,由導(dǎo)風(fēng)槽和排風(fēng)降噪腔組成。排風(fēng)降噪腔的作業(yè)原理,類似于阻性消聲器。可經(jīng)過替換吸音資料(改動(dòng)資料的吸音系數(shù)),改動(dòng)吸音資料厚度、排風(fēng)通道長(zhǎng)度和寬度等參數(shù)來提高消音效果。

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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