發(fā)布時(shí)間：2018-05-12 02:04

  本文選題：泡沫瀝青 + 雙軸臥式攪拌設(shè)備��； 參考：《內(nèi)蒙古工業(yè)大學(xué)》2014年碩士論文

【摘要】：攪拌設(shè)備是一種應(yīng)用相當(dāng)廣泛的工程機(jī)械。在各類攪拌設(shè)備當(dāng)中，瀝青混合料的攪拌設(shè)備主要以強(qiáng)制雙軸臥式攪拌設(shè)備為主。隨著泡沫瀝青發(fā)泡技術(shù)的不斷成熟，以及其較普通瀝青與集料拌合的高技術(shù)性，因而對(duì)強(qiáng)制雙軸臥式攪拌設(shè)備的內(nèi)部結(jié)構(gòu)進(jìn)行優(yōu)化，對(duì)提高泡沫瀝青混合料拌合的技術(shù)水平有著極其重要的意義。雙軸臥式攪拌設(shè)備內(nèi)部的物料流動(dòng)是十分復(fù)雜的非定常湍流流動(dòng)，它的各項(xiàng)流動(dòng)性能都直接與內(nèi)部流場(chǎng)密切相關(guān)。通過(guò)攪拌設(shè)備的內(nèi)部結(jié)構(gòu)設(shè)計(jì)，三維建模，CFD軟件分析，從而解析攪拌設(shè)備內(nèi)部流場(chǎng)，優(yōu)化內(nèi)部流場(chǎng)結(jié)構(gòu)，可最終提高雙軸臥式攪拌設(shè)備的設(shè)計(jì)水平。 本文首先根據(jù)泡沫瀝青的物理特性、泡沫瀝青混合料級(jí)配以及實(shí)驗(yàn)工作要求，確定了攪拌設(shè)備為強(qiáng)制間歇式雙軸臥式攪拌設(shè)備。 根據(jù)雙軸臥式攪拌設(shè)備影響拌和性能的結(jié)構(gòu)形式參數(shù)，使用三維建模軟件UG建立三維模型。應(yīng)用流體力學(xué)分析軟件Fluent的前處理軟件Gambit建立網(wǎng)格數(shù)遞增的六面體網(wǎng)格，從而確定了兼顧計(jì)算精度和效率的合適的網(wǎng)格規(guī)模�；诓⑿蠪luent的歐拉多相流模型和動(dòng)網(wǎng)格UDF模型，通過(guò)改變攪拌軸轉(zhuǎn)動(dòng)位置進(jìn)行一系列的非穩(wěn)態(tài)湍流計(jì)算。通過(guò)結(jié)果對(duì)比分析，研究湍流模型中葉輪轉(zhuǎn)動(dòng)過(guò)程其幾何形狀對(duì)計(jì)算結(jié)果的影響，找到各計(jì)算結(jié)果中結(jié)構(gòu)之間的關(guān)系，為利用CFD技術(shù)開(kāi)發(fā)新的高效的雙軸臥式攪拌設(shè)備打下基礎(chǔ)。 在對(duì)比分析中，分別設(shè)計(jì)了雙軸攪拌臂正正、正反、反反三種排列形式和葉片安裝角為45°和60°兩種安裝角度。實(shí)驗(yàn)結(jié)果表明，葉片正正裝，攪拌葉片的安裝角度為45°，攪拌臂排列方式為圍流，兩軸攪拌臂交錯(cuò)布置，，單軸攪拌臂相位為90°可以較好地提高雙軸臥式攪拌設(shè)備的效果。該方法實(shí)現(xiàn)了有效利用湍流方程來(lái)控制邊界層的圍流運(yùn)動(dòng)形態(tài)，進(jìn)而為提高攪拌效果提供了設(shè)計(jì)依據(jù)，對(duì)雙軸臥式攪拌設(shè)備的設(shè)計(jì)理論具有積極意義。
[Abstract]:Mixing equipment is a kind of widely used construction machinery. Among all kinds of mixing equipment, the mixing equipment of asphalt mixture is mainly forced two-axis horizontal mixing equipment. With the maturation of foaming technology of foamed asphalt and its high technology compared with ordinary asphalt and aggregate, the internal structure of forced biaxial horizontal mixing equipment is optimized. It is of great significance to improve the technical level of mixing foamed asphalt mixture. The material flow in a biaxial horizontal mixing plant is a very complicated unsteady turbulent flow, and its flow performance is closely related to the internal flow field. Through the design of the internal structure of the mixing equipment and the analysis of the CFD software, the internal flow field of the mixing equipment is analyzed and the internal flow field structure is optimized, which can eventually improve the design level of the two-axis horizontal mixing equipment. Firstly, according to the physical characteristics of foamed asphalt, the gradation of foamed asphalt mixture and the requirements of experimental work, this paper determines that the mixing equipment is a forced intermittent biaxial horizontal mixing equipment. According to the structural parameters of the biaxial horizontal mixing equipment which affects the mixing performance, the 3D modeling software UG is used to build the 3D model. The hexahedron mesh with increasing number of meshes is established by using the pre-processing software Gambit of the hydrodynamic analysis software Fluent, which determines the appropriate mesh size which takes into account the calculation accuracy and efficiency. Based on the Euler multiphase flow model and the dynamic grid UDF model of parallel Fluent, a series of unsteady turbulence calculations are carried out by changing the rotating position of the stirring axis. Through comparative analysis of the results, the influence of the geometry of the impeller rotation process on the calculation results in the turbulent model is studied, and the relationship between the structures in the calculation results is found. It lays a foundation for the development of a new high-efficiency two-axis horizontal mixing equipment using CFD technology. In the comparison and analysis, the forward, reverse and backward arrangement of the two-axis stirring arm are designed, respectively, and the installation angles of the blade are 45 擄and 60 擄respectively. The experimental results show that the installation angle of the blade is 45 擄, the arrangement of the mixing arm is circumfluence, the two-axis mixing arm is staggered and the phase of the single-axis stirring arm is 90 擄, the effect of the two-axis horizontal mixing equipment can be improved better. The method realizes the effective use of turbulence equations to control the flow pattern of the boundary layer and provides the design basis for improving the mixing effect. It is of positive significance to the design theory of the two-axis horizontal mixing equipment.
【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U415.522

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