本文選題：螺旋曝氣法 + 螺旋曝氣池��； 參考：《東南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2016年05期

【摘要】：為了提高曝氣效率,提出了一種具有螺旋流場(chǎng)特性的新型曝氣方式.通過對(duì)螺旋曝氣進(jìn)行理論分析發(fā)現(xiàn),該方法可以提高氣液兩相的總接觸面積,進(jìn)而增強(qiáng)曝氣效率.同時(shí)采用EulerEuler雙流體模型對(duì)螺旋曝氣池流場(chǎng)進(jìn)行了數(shù)值模擬,并與傳統(tǒng)曝氣方式(垂直曝氣和水平曝氣)進(jìn)行對(duì)比分析.工程實(shí)例分析結(jié)果表明,當(dāng)曝氣總流量為7.48 kg/s時(shí),螺旋曝氣池全流域平均混合效率約為垂直曝氣池的23倍,且為水平曝氣池的10倍.此外,對(duì)螺旋曝氣池中渦運(yùn)動(dòng)和湍流脈動(dòng)等流動(dòng)機(jī)理進(jìn)行分析以及對(duì)氣含率分布的考察發(fā)現(xiàn),螺旋曝氣中的氣羽柱前行路徑成螺旋狀,渦運(yùn)動(dòng)和湍流脈動(dòng)增強(qiáng),使得氣液總接觸面積增大,流場(chǎng)更均勻,曝氣效率更高.
[Abstract]:In order to improve aeration efficiency, a new aeration method with helical flow field characteristics was proposed. Through theoretical analysis of spiral aeration, it is found that this method can increase the total contact area of gas-liquid two phases and further enhance aeration efficiency. At the same time, the EulerEuler two-fluid model was used to simulate the flow field of spiral aeration tank, and compared with the traditional aeration mode (vertical aeration and horizontal aeration). The result of engineering example shows that when the total aeration flow is 7.48 kg/s, the average mixing efficiency of spiral aeration tank is about 23 times of that of vertical aeration tank and 10 times of that of horizontal aeration tank. In addition, the flow mechanism of vortex motion and turbulence pulsation in spiral aeration tank is analyzed and the gas holdup distribution is investigated. It is found that the forward path of the gas plume in spiral aeration becomes spiral, and the vortex motion and turbulence pulsation are enhanced. The gas-liquid contact area is increased, the flow field is more uniform, and the aeration efficiency is higher.
【作者單位】： 南京航空航天大學(xué)航空宇航學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(21407077) 江蘇省“六大人才高峰”資助項(xiàng)目(2012-JNHB-014) 江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程資助項(xiàng)目
【分類號(hào)】：X703
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本文編號(hào)：1841154