本文選題：氣旋流　切入點：非接觸懸浮傳送　出處：《浙江大學(xué)》2017年碩士論文

【摘要】：本課題研究了一種具有流量放大功能的新型空氣懸浮單元:氣旋流懸浮單元。氣旋流懸浮單元利用高速旋轉(zhuǎn)氣流所產(chǎn)生的負壓吸入額外的空氣,從而能夠大幅降低耗氣量,在玻璃基板非接觸懸浮傳送的應(yīng)用上可帶來相當(dāng)可觀的節(jié)能效果。目前,氣旋流懸浮單元的相關(guān)研究仍處于初期階段,因此,深入了解其流場結(jié)構(gòu)和流量放大特性、明確流量放大的內(nèi)在機理對于今后的優(yōu)化設(shè)計和應(yīng)用開發(fā)而言至關(guān)重要。首先,我們通過實驗研究詳細分析了氣旋流懸浮單元的排氣縫隙處的壓力分布,指出壓力分布曲線與流場之間的聯(lián)系,以及吸入孔對懸浮單元流場的影響。接著,我們研究了縫隙高度和供給流量對懸浮單元流場、壓力場和吸入流量的影響。此外,我們還利用流體數(shù)值仿真(CFD)來討論了圓柱腔內(nèi)和縫隙處的流線,速度場和壓力分布情況,明確了氣旋流懸浮單元實現(xiàn)流量放大的基本原理以及吸入孔對懸浮單元各區(qū)域的影響�；谏鲜龅膶嶒灁�(shù)據(jù)和流體數(shù)值仿真的工作,我們簡化了Navier-Stokes方程,并結(jié)合角動量守恒和近壁面經(jīng)驗?zāi)Ｐ?提出了氣旋流懸浮單元的流場的數(shù)學(xué)模型。與實驗結(jié)果進行對比后可知,該數(shù)學(xué)模型能很好地再現(xiàn)縫隙的速度分布,壓力分布形狀和吸入流量曲線的趨勢;因為忽略了氣流在豎直方向的流動、上下壁面的阻力等因素,所以最終積分得到的壓力數(shù)據(jù)和吸入流量數(shù)據(jù)與實驗值之間存在一定程度的偏差。最后,本論文根據(jù)理論分析結(jié)果,設(shè)計制作了一種結(jié)構(gòu)可變的氣旋流懸浮單元,以此來探究圓柱腔高度、吸入孔直徑等設(shè)計參數(shù)對流量放大效果的影響。實驗研究發(fā)現(xiàn),圓柱腔過高不利于懸浮單元從外界吸入空氣;吸入孔的直徑直接決定了被吸入的空氣進入圓柱腔的阻力大小,因此,增大吸入孔的直徑能夠有效地提高流量放大效果。
[Abstract]:In this paper, a new type of air suspension unit with the function of flow amplification is studied.Cyclone flow suspension unit inhale extra air by negative pressure generated by high speed rotating airflow, which can greatly reduce air consumption, and can bring considerable energy saving effect in the application of glass substrate non-contact suspension transport.At present, the research of cyclone flow suspension unit is still in its initial stage. Therefore, it is very important to understand the structure of flow field and the characteristics of flow amplification and clarify the internal mechanism of flow amplification for the future optimization design and application development.Firstly, we analyze the pressure distribution at the vent gap of the swirl suspension unit in detail through experimental research, and point out the relationship between the pressure distribution curve and the flow field, and the influence of the suction hole on the flow field of the suspension unit.Then, we study the effects of gap height and supply flow on the flow field, pressure field and suction flow of suspension unit.In addition, the flow line, velocity field and pressure distribution in the cylindrical cavity and the slot are discussed by using the fluid numerical simulation (CFDs).The basic principle of the flow amplification by the swirl suspension unit and the influence of the suction hole on each region of the suspension unit are clarified.Based on the above experimental data and the work of numerical simulation of fluid, we simplify the Navier-Stokes equation, combine the conservation of angular momentum and the empirical model near the wall, and put forward the mathematical model of the flow field of the gas-swirl suspension unit.Compared with the experimental results, the mathematical model can well reproduce the velocity distribution, the pressure distribution shape and the tendency of the suction flow curve of the gap, because the air flow in the vertical direction and the resistance of the upper and lower wall are ignored.So there is a certain deviation between the pressure data and the suction flow data and the experimental data.Finally, according to the results of theoretical analysis, a variable structure swirl suspension unit is designed and fabricated to explore the influence of the design parameters such as the height of cylindrical cavity and the diameter of suction hole on the effect of flow amplification.The experimental results show that the cylinder cavity is too high for the suspension unit to inhale air from the outside, and the diameter of the suction hole directly determines the resistance of the inhaled air to the cylindrical cavity.Increasing the diameter of the suction hole can effectively improve the effect of flow amplification.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN873

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本文編號：1708953