本文選題：氣固分離　切入點：離心葉輪　出處：《華中科技大學(xué)》2015年碩士論文

【摘要】：氣固分離與排氣一體機(以下簡稱一體機),創(chuàng)新性地將離心風(fēng)機置于傳統(tǒng)旋風(fēng)分離器內(nèi)部,對超細顆粒具有較強的分離能力,然而前人研究表明,一體機分離筒體部分壓力損失太大,離心風(fēng)機提供的能頭不足以滿足氣體在一體機中運輸,所以需要對裝置進行改進,提升裝置能頭,改善一體機內(nèi)部流場。本文即從增加一體機能頭的角度進行探索性研究,通過改變一體機的單一做功部件(離心風(fēng)機),在一體機中加入不同類型的葉輪機械,通過數(shù)值模擬研究不同做功部件對一體機能頭的影響,并對比不同模型的內(nèi)部流場情況和分離性能,為提高一體機的能頭和分離效率做貢獻。主要內(nèi)容和結(jié)論如下:(1)選擇軸流風(fēng)機和離心扭曲葉輪作為提高一體機能頭的方向。用CF-turbo對離心扭曲葉輪建模,采用MATLAB和SolidWorks對軸流風(fēng)機進行建模。選擇適合一體機的做功元件并確定對比模型:原始模型(A)與加入離心扭曲葉輪后的模型(B);原始模型(A)與加軸流風(fēng)機后的模型(C);加軸流風(fēng)機后的模型(C)和同時加入軸流和扭曲葉輪的模型(D)。(2)通過模擬發(fā)現(xiàn),軸流風(fēng)機能有效改善一體機流場,但是并沒有增加離心葉輪的能頭,表示軸流風(fēng)機和離心風(fēng)機匹配并不成功,后期還應(yīng)繼續(xù)探索。(3)離心扭曲葉輪能夠很好的提高一體機的能頭,模擬算例中離心葉輪全壓提高了18.7%,但是分離筒壓力損失也相應(yīng)增加了,提高一體機能頭的同時應(yīng)該同時考慮減小壓力損失。(4)采用隨機軌道模型(DPM)對模型機內(nèi)顆粒相進行模擬,結(jié)果顯示一體機對超細顆粒具有較強的分離能力。
[Abstract]:The gas-solid separation and exhaust integrated machine (hereinafter referred to as "integrated machine") innovatively placed the centrifugal fan inside the traditional cyclone separator, which has a strong ability to separate ultrafine particles. However, previous studies have shown that, The pressure loss of the separation cylinder part of the integrated machine is too large, the energy head provided by the centrifugal fan is not enough to satisfy the gas transportation in the integrated machine, so it is necessary to improve the device and raise the energy head of the device. Improving the internal flow field of an integrated machine. In this paper, an exploratory study is carried out from the angle of increasing the energy head of an integrated machine, and by changing the single work component of the integrated machine (centrifugal fan or fan, different types of impeller machinery are added to the integrated machine, Through numerical simulation, the influence of different work components on the energy head of an integrated machine is studied, and the internal flow field and separation performance of different models are compared. In order to improve the energy head and separation efficiency of an integrated machine, the main contents and conclusions are as follows: 1) the axial flow fan and centrifugal twisted impeller are selected as the direction to improve the energy head of the integrated machine. The centrifugal twisted impeller is modeled by CF-turbo. MATLAB and SolidWorks are used to model the axial flow fan. The work elements suitable for the integrated machine are selected and the comparative models are determined: the original model (A) and the model after the centrifugal twisted impeller is added, the original model (A) and the model after adding the axial flow fan (A) and the model after the addition of the axial flow fan are selected. The model after adding axial flow fan (C) and the model with axial flow and twisted impeller are found by simulation. The axial flow fan can effectively improve the flow field of the integrated engine, but it does not increase the energy head of the centrifugal impeller, indicating that the matching between the axial flow fan and the centrifugal fan is not successful, and should continue to explore at the later stage) that the centrifugal twisted impeller can improve the energy head of the integrated machine very well. In the simulation example, the full pressure of centrifugal impeller is increased by 18.7%, but the pressure loss of the separation cylinder is also increased accordingly. While increasing the energy head of an integrated machine, the pressure loss should be reduced at the same time. (4) the particle phase in the model is simulated by using the random track model (DPM). The results show that the one-body machine has strong separation ability for ultrafine particles.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X701.2

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