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class="ny_right"> <div id="az3h0fd4mnm" class="ny_title"> <span id="az3h0fd4mnm" class="left"> <strong>技術(shù)文章 </strong>/ article </span> <span id="az3h0fd4mnm" class="right"><img src="/skins/147426/images/home.png">您的位置：<a href="/">網(wǎng)站首頁</a> > <a href="/article.html">技術(shù)文章</a> > 簡析離心式風機的氣動噪音是怎么回事？怎么產(chǎn)生的？</span> </div> <div id="az3h0fd4mnm" class="right_content"> <div id="az3h0fd4mnm" class="art-cont"> <h1 class="art-title">簡析離心式風機的氣動噪音是怎么回事？怎么產(chǎn)生的？</h1> <div id="az3h0fd4mnm" class="art-info"> 發(fā)布時間： 2022-01-17　　點擊次數(shù)： 1400次 </div> <div id="az3h0fd4mnm" class="art-body"> <div>　　簡析離心式風機的氣動噪音是怎么回事？怎么產(chǎn)生的？</div><div>　　離心風機屬于葉輪機械的一種，是一種比較精密的運轉(zhuǎn)機械，是工農(nóng)業(yè)生產(chǎn)中主要耗能設(shè)備之一，是除塵通風系統(tǒng)中四大件之一。其通風機理依靠葉輪的轉(zhuǎn)動在風機內(nèi)部形成負壓，將外界氣體吸入并經(jīng)葉輪流道和蝸殼排出風機。廣泛應(yīng)用于能源、環(huán)境、航空等各個領(lǐng)域。隨著國民經(jīng)濟的和社會的發(fā)展，工作和居住環(huán)境的噪聲越來越受到人們的關(guān)注。而工業(yè)生產(chǎn)中廣泛使用的離心風機是噪聲污染的一個重要來源，它遍及人們工作和生活的周圍，因而日益引起人們對離心風機噪聲控制研究的重視。今天廠家簡單談?wù)勲x心式風機的氣動噪音是怎么回事？怎么產(chǎn)生的？來看看吧。</div><div>　　氣動噪聲主要包括旋轉(zhuǎn)噪聲和渦流噪聲。</div><div>　　旋轉(zhuǎn)噪聲又稱離散頻率噪聲，當風機旋轉(zhuǎn)時，葉輪上的葉片通道出口處沿周向的氣流壓力與氣流速度都有較大的變化。當蝸舌與葉片出口邊緣間的間隙較小時，旋轉(zhuǎn)的葉片通道掠過蝸舌處就會出現(xiàn)周期性的壓力和速度脈動。此種脈動產(chǎn)生的噪聲被稱為旋轉(zhuǎn)噪聲。</div><div>　　渦流噪聲也稱旋渦噪聲，是葉輪在旋轉(zhuǎn)過程中，葉輪葉片與氣體相互作用、耦合所輻射的寬頻帶噪聲，包括來流紊流噪聲、紊流邊界層噪聲、尾緣渦流脫落噪聲和葉尖渦流噪聲。它是由于氣體流經(jīng)物體表面形成的紊流邊界層及其脫體，引起氣流壓力脈動造成的。離心風機產(chǎn)生渦流噪聲的主要原因是靠近葉片出口處的附面層分離，氣流在蝸殼內(nèi)擴壓流動時的分離，葉片迸口處的流動分離以及偏離設(shè)計工況時的流動惡化等。該噪聲與風機內(nèi)部氣流的流動狀況密切相關(guān)，設(shè)計制作良好的風機，因其內(nèi)部流動狀態(tài)理想,形成的邊界層脫體較少，則此類噪聲較低:反之，則噪聲較高。</div> </div> <div id="az3h0fd4mnm" class="art-next"> 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