本文選題：氣力輸送系統(tǒng) + 噴射器�。� 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：氣力輸送裝置具有不直接消耗機(jī)械能而實(shí)現(xiàn)增壓過程,輸送過程相對傳統(tǒng)機(jī)械輸送具有安全、結(jié)構(gòu)簡單、易于自動化過程、對環(huán)境污染少,可以使固體顆粒沿著輸送管道實(shí)現(xiàn)一到多地的輸送和多地向一地的聚集等優(yōu)點(diǎn)�，F(xiàn)已廣泛運(yùn)用在礦產(chǎn)、電力、水泥、糧食、鑄造、建材等領(lǐng)域中。噴射器是氣力輸送系統(tǒng)的關(guān)鍵裝置,其結(jié)構(gòu)和性能都必受到人們越來越多的關(guān)注。從噴射器工作原理出發(fā),對設(shè)計(jì)所涉及到的理論計(jì)算公式進(jìn)行了歸納。由實(shí)際設(shè)計(jì)要求,采用最優(yōu)化結(jié)構(gòu)設(shè)計(jì)法,對噴射器的主要尺寸進(jìn)行了設(shè)計(jì)。氣力輸送系統(tǒng)涉及到兩相流動,由于兩相流動的復(fù)雜性,對于氣力輸送相關(guān)的設(shè)計(jì)計(jì)算大部分采用理論和實(shí)驗(yàn)相結(jié)合的方法。本文利用FLUENT軟件,采用雙歐拉模型和離散模型對其內(nèi)部流動進(jìn)行了數(shù)值模擬。首先利用三維建模工具對噴射器模型建立,再通過網(wǎng)格劃分軟件對其進(jìn)行網(wǎng)格劃分,最后在FLUENT軟件中完成對噴射器的數(shù)值模擬。通過數(shù)值模擬驗(yàn)證所設(shè)計(jì)結(jié)構(gòu)的準(zhǔn)確性,并對其內(nèi)部的流動特性進(jìn)行了分析�？紤]了結(jié)構(gòu)參數(shù)改變對氣力輸送噴射器的影響,得到了靜壓變化曲線,固體顆粒速度矢量圖、氣體湍流動能圖和速度云圖等。分析了不同結(jié)構(gòu)參數(shù)對氣力輸送系統(tǒng)的性能影響,并對氣力輸送相關(guān)的輸送管道的顆粒懸浮理論做了驗(yàn)證。所運(yùn)用的設(shè)計(jì)理論過程和數(shù)值模擬過程,對噴射器在工程上的應(yīng)用有一定的指導(dǎo)作用。
[Abstract]:Pneumatic conveying device has the advantages of realizing pressurized process without directly consuming mechanical energy. Compared with traditional mechanical transportation, the conveying process is safe, simple in structure, easy to automate process, and less pollution to the environment. The solid particles can be transported one to many places along the conveying pipeline and aggregating from one place to one place. Has been widely used in minerals, electricity, cement, grain, casting, building materials and other fields. Ejector is the key device of pneumatic conveying system, its structure and performance will be paid more and more attention. Based on the working principle of the ejector, the theoretical calculation formulas involved in the design are summarized. According to the actual design requirements, the main dimensions of the ejector are designed by the method of optimum structure design. Pneumatic conveying system involves two-phase flow. Due to the complexity of two-phase flow, most of the design and calculation of pneumatic conveying are based on the combination of theory and experiment. In this paper, FLUENT software is used to simulate the internal flow with double Euler model and discrete model. Firstly, the ejector model is built by using 3D modeling tools, then the ejector model is meshed by the meshing software. Finally, the numerical simulation of the ejector is completed in FLUENT software. The accuracy of the designed structure is verified by numerical simulation, and its internal flow characteristics are analyzed. Considering the influence of the structural parameters on the pneumatic conveying injector, the static pressure variation curve, the velocity vector diagram of solid particles, the kinetic energy map of gas turbulence and the velocity cloud diagram are obtained. The influence of different structural parameters on the performance of pneumatic conveying system is analyzed, and the particle suspension theory of pneumatic conveying pipeline is verified. The design theory process and numerical simulation process are used to guide the application of ejector in engineering.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH232

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