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2023-07-18　　點(diǎn)擊次數(shù)： 864次 </div> <div id="pfyahkbyo" class="art-body"> <div><span style="font-size: 14px;">　　1、增強(qiáng)工業(yè)渦流風(fēng)機(jī)葉柵的氣動(dòng)力栽荷，降低圓周速度<br /> </span></div><div><span style="font-size: 14px;">　　對(duì)于風(fēng)機(jī)采用強(qiáng)前向葉片，且多葉片葉輪有利于增大葉柵的氣動(dòng)力載荷，在得到同樣風(fēng)量風(fēng)壓情況下，葉輪葉片外圓上圓周速度可使風(fēng)機(jī)噪聲明顯降低。<br /> </span></div><div><span style="font-size: 14px;">　　2、合理的蝸舌間隙和蝸舌半徑<br /> </span></div><div><span style="font-size: 14px;">　　當(dāng)氣流與葉片做相對(duì)運(yùn)動(dòng)時(shí)，葉片后緣的氣流尾跡中速度及壓力均小于主流區(qū)，使葉柵后的氣流速度與壓力分布皆不均勻，這種不均勻的氣流在旋轉(zhuǎn)，由于在動(dòng)葉的氣流出口有蝸舌存在，則這種非穩(wěn)定流動(dòng)與蝸舌相互作用將產(chǎn)生噪聲，距離噪聲愈近噪聲愈烈，通常適當(dāng)取較大的風(fēng)舌前端半徑可以降低離心風(fēng)機(jī)的旋轉(zhuǎn)噪聲與渦流噪聲。<br /> </span></div><div><span style="font-size: 14px;">　　3、蝸舌傾斜<br /> </span></div><div><span style="font-size: 14px;">　　工業(yè)渦流風(fēng)機(jī)葉輪葉柵氣流的周期性脈動(dòng)速度所產(chǎn)生的周期性脈動(dòng)氣動(dòng)力也使蝸舌相互作用產(chǎn)生旋轉(zhuǎn)噪聲，此噪聲大小與脈動(dòng)氣動(dòng)力的劇烈程度及渦舌的迎風(fēng)面積有關(guān)，把蝸舌做成傾斜式，則同相位的脈動(dòng)氣動(dòng)力的作用面積小了，輻射的噪聲也就減小了。<br /> </span></div><div><span style="font-size: 14px;">　　4、葉輪入(出)口處加紊流化裝置<br /> </span></div><div><span style="font-size: 14px;">　　在風(fēng)機(jī)葉輪葉片的入口或出口處加紊流化裝置(金屬網(wǎng))可以使葉片背面的層流附面層立即轉(zhuǎn)換成紊流附面層，推遲葉片背面附面層的分離，甚至不分離，葉片后緣裝上網(wǎng)，氣流速度與壓力梯度能迅速變均勻，若網(wǎng)在渦區(qū)中則可將渦區(qū)大大縮小，可進(jìn)一步減噪。<br /> </span></div><div><span style="font-size: 14px;">　　5、在動(dòng)葉進(jìn)出氣邊上設(shè)鋸齒形結(jié)構(gòu)<br /> </span></div><div><span style="font-size: 14px;">　　在動(dòng)葉進(jìn)出氣邊上設(shè)鋸齒形結(jié)構(gòu)可使葉片上氣流層流附面層較早地轉(zhuǎn)化為紊流，從而避免層流附面層中的不穩(wěn)定波導(dǎo)致渦流分離，使渦流分離，噪聲降低。<br /> </span></div><div><span style="font-size: 14px;">　　6、在蝸舌處設(shè)置聲學(xué)共振器<br /> </span></div><div><span style="font-size: 14px;">　　蝸舌處設(shè)置聲學(xué)共振器，當(dāng)聲波傳到共振器時(shí)，小孔孔徑和空腔中的氣體存聲波作用下來(lái)回運(yùn)動(dòng)，這運(yùn)動(dòng)的氣體具有一定的質(zhì)量，它抗拒由于聲波作用而引起的運(yùn)動(dòng)，同時(shí)聲波進(jìn)入小孔孔徑時(shí)，由于頸壁的摩擦和阻尼，使相當(dāng)一部分聲能因熱耗而損失掉。另外充滿氣體的空腔具有阻礙來(lái)自小孔的壓力變化的特性，由于這些因素的共同作用，當(dāng)氣體通過(guò)共振器時(shí)，噪聲得到了降低。</span></div> </div> <div id="pfyahkbyo" class="art-next"> <dl class="shangxia"> <dd>上一篇：<a href="/Article-357661.html">真空渦旋氣泵故障排除</a></dd> <dd>下一篇：<a href="/Article-346703.html">曝氣高壓氣泵能夠滿足各種不同的曝氣設(shè)備的使用需求</a></dd> </dl> </div> </div> </div> </div> </div> </div> <div class="pfyahkbyo" id="clear"></div>  <div id="pfyahkbyo" class="foot_box"> <div id="pfyahkbyo" class="foot_t"> <div id="pfyahkbyo" class="w1200"> <a href="/">網(wǎng)站首頁(yè)</a>　|　<a href="/aboutus.html">關(guān)于我們</a>　|　<a href="/products.html">產(chǎn)品中心</a>　|　<a href="/news.html">新聞動(dòng)態(tài)</a>　|　<a href="/article.html">技術(shù)文章</a>　|　<a href="/honor.html">榮譽(yù)資質(zhì)</a>　|　<a href="/order.html">在線留言</a>　|　<a 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