發(fā)布時(shí)間：2018-10-14 10:42

【摘要】：防風(fēng)網(wǎng)抑塵工程技術(shù)是治理大型露天料堆場(chǎng)二次揚(yáng)塵的有效措施,其主要是由具有一定開(kāi)孔率的金屬網(wǎng)板或者編織、粘接、擠壓成型的非金屬網(wǎng)片,懸掛防風(fēng)網(wǎng)片并起支撐作用的鋼構(gòu)架,地面混凝土基礎(chǔ)組成,該技術(shù)的核心部件為防風(fēng)網(wǎng),而防風(fēng)網(wǎng)尾流區(qū)的流場(chǎng)特性直接影響著防風(fēng)網(wǎng)的抑塵效果。 本文以當(dāng)前防風(fēng)網(wǎng)抑塵工程建設(shè)常用的蝶形防風(fēng)網(wǎng)為研究對(duì)象,采用Fluent軟件為模擬工具,進(jìn)行開(kāi)孔率和底部間隙對(duì)蝶形網(wǎng)尾流區(qū)內(nèi)流場(chǎng)特性影響的數(shù)值模擬,并且通過(guò)與實(shí)驗(yàn)數(shù)據(jù)的對(duì)比來(lái)驗(yàn)證本文數(shù)值模型的合理性與正確性。其次,在數(shù)值模型驗(yàn)證正確性的基礎(chǔ)上,開(kāi)展開(kāi)孔率、開(kāi)孔直徑、開(kāi)孔形式、孔的分布情況及底部間隙對(duì)蝶形防風(fēng)網(wǎng)尾流區(qū)內(nèi)流場(chǎng)特性影響的數(shù)值模擬。得出了如下的結(jié)論： (1)通過(guò)模擬結(jié)果與實(shí)驗(yàn)數(shù)據(jù)的對(duì)比驗(yàn)證了本文所建立的數(shù)值模型是正確的,可以作為進(jìn)行蝶形防風(fēng)網(wǎng)相關(guān)內(nèi)容研究的有效手段； (2)針對(duì)圓孔直徑為6mm的蝶形防風(fēng)網(wǎng),開(kāi)孔率Φ=0.301時(shí)庇護(hù)效果最好,減風(fēng)率為65.33%； (3)針對(duì)開(kāi)孔率Φ=0.301的蝶形防風(fēng)網(wǎng),圓孔直徑D=9mm時(shí)庇護(hù)效果最好,減風(fēng)率為69.274%； (4)針對(duì)開(kāi)孔率Φ=0.301且開(kāi)孔截面積相同的蝶形防風(fēng)網(wǎng),圓形開(kāi)孔庇護(hù)效果最好,減風(fēng)率為69.274%； (5)開(kāi)孔率Φ=0.301,圓孔直徑為D=6mm的蝶形防風(fēng)網(wǎng),以中間平板為基準(zhǔn)將網(wǎng)板分為上下對(duì)稱(chēng)的兩部分,上部Φ=0.25下部Φ=0.35時(shí)庇護(hù)效果最好,減風(fēng)率為71.35%；均勻布孔時(shí)減風(fēng)率為69.27%,兩者差距非常小,但考慮到現(xiàn)實(shí)加工的難易程度和加工成本,均勻布孔的蝶形防風(fēng)網(wǎng)應(yīng)為工程首選； (6)開(kāi)孔率Φ=0.273,圓孔直徑D=6mm且均勻分布的蝶形網(wǎng),底部間隙在0-0.025H時(shí)蝶形防風(fēng)網(wǎng)的庇護(hù)效果最好,減風(fēng)率都在60%以上。
[Abstract]:The anti-dust engineering technology of windproof net is an effective measure to control the secondary hoisting dust in large open-air storage yard. It is mainly made up of metal mesh plate with a certain opening rate or non-metal mesh that is woven, bonded and extruded. The main component of this technology is windproof net, which is composed of steel frame and ground concrete foundation. The characteristics of flow field in wake zone of windproof net have direct influence on the dust suppression effect of windproof net. In this paper, using the Fluent software as the simulation tool, the numerical simulation of the influence of the opening rate and the bottom clearance on the flow field characteristics in the wake zone of the butterfly mesh is carried out, which is commonly used in the construction of the current wind screen dust suppression engineering as the object of study, and the Fluent software is used as the simulation tool. The rationality and correctness of the numerical model are verified by comparing with the experimental data. Secondly, on the basis of the correctness of the numerical model, numerical simulation is carried out on the influence of the opening rate, the diameter of the hole, the form of the hole, the distribution of the hole and the bottom clearance on the characteristics of the flow field in the wake zone of the butterfly windbreakers. The conclusions are as follows: (1) by comparing the simulation results with the experimental data, the numerical model established in this paper is proved to be correct and can be used as an effective means to study the relevant contents of the butterfly windbreak network; (2) for butterfly wind-proof mesh with round hole diameter of 6mm, the opening rate 桅 = 0.301 is the best, and the wind reducing rate is 65.33.The (3) for the butterfly windproof net with opening rate 桅 = 0.301, the sheltering effect is the best when the diameter of circular hole is D=9mm, and the wind reducing rate is 69.274; (4) for the butterfly wind-proof net with opening ratio 桅 = 0.301 and the same cross section area, the circular aperture has the best shelter effect, and the wind reducing rate is 69.274.The (5) the butterfly wind mesh with opening rate 桅 = 0.301 and the diameter of the circular hole D=6mm, is the best, and the diameter of the circular hole is D=6mm, the diameter of the circular hole is D=6mm. On the basis of the intermediate plate, the mesh plate is divided into two parts: the upper section 桅 = 0.25, the lower 桅 = 0.35, the sheltering effect is the best, the wind reducing rate is 71.35, and the air reducing rate is 69.27 when the holes are evenly arranged, the difference between them is very small. However, considering the difficulty and cost of machining in reality, the butterfly windproof mesh with uniform hole placement should be the first choice for engineering; (6) the opening ratio 桅 = 0.273, the diameter of circular hole D=6mm, and the evenly distributed butterfly mesh, When the bottom gap is 0-0.025H, the sheltering effect of butterfly windproof net is the best, and the wind reduction rate is above 60%.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：X964

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