本文關(guān)鍵詞：基于歐拉模型的葉片式拋送裝置內(nèi)氣固兩相流模擬　出處：《內(nèi)蒙古工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 葉片式拋送裝置 氣固兩相流 歐拉模型 參數(shù)化分析

【摘要】：為弄清葉片式拋送裝置工作時(shí)其內(nèi)部物料和氣流的真實(shí)流動情況和分布規(guī)律，本文借助CFD（ComputationalFluid Dynamic）軟件Fluent6.3對裝置內(nèi)部的氣固兩相流流場進(jìn)行三維數(shù)值模擬計(jì)算，獲得了拋送物料過程中裝置內(nèi)兩相流場的壓力及速度分布狀況以及物料運(yùn)動規(guī)律，同時(shí)對葉片式拋送裝置主要工作參數(shù)對兩相流場及物料運(yùn)動的影響進(jìn)行對比分析。 本文在分析了葉片式拋送裝置工作原理基礎(chǔ)上，建立了基于Eulerian模型的葉片式拋送裝置內(nèi)氣固兩相流數(shù)學(xué)模型；創(chuàng)建了裝置的三維實(shí)體模型及流道模型，，并分區(qū)對其進(jìn)行網(wǎng)格劃分；確定了該裝置內(nèi)氣固兩相流數(shù)值模擬方法：采用Eulerian模型和標(biāo)準(zhǔn)k-ε湍流模型，選用simple算法對裝置內(nèi)部流場進(jìn)行數(shù)值模擬；將物料速度仿真計(jì)算結(jié)果與文獻(xiàn)[15]相同工況下高速攝像實(shí)測數(shù)據(jù)進(jìn)行比較分析，在驗(yàn)證模擬結(jié)果可靠基礎(chǔ)上，進(jìn)行了裝置主要工作參數(shù)對物料運(yùn)動影響的對比分析。 經(jīng)數(shù)值計(jì)算，本文得出：1.葉片數(shù)為四時(shí)，與葉片數(shù)為三和五比較，壓力場分布對稱均勻且速度場的渦流區(qū)域較小，拋送性能較好。2.進(jìn)料速度對物料的流場分布影響很大；進(jìn)料速度為13.5m/s時(shí)裝置既不會造成堵塞，又能在單位時(shí)間拋出更多的物料，拋送效率較高，為此工況下的最佳進(jìn)料速度。3.進(jìn)料口物料體積濃度變化僅改變?nèi)~輪以及出料管區(qū)的物料濃度，進(jìn)料口處物料體積濃度越大，整個(gè)區(qū)域的物料體積濃度越大；而對物料速度分布規(guī)律及大小影響不大。4.葉輪葉片安裝時(shí)傾斜一定角度有利于物料拋送，葉片后傾10o時(shí)葉輪區(qū)速度分布更為均勻，渦流小，有利于拋送效率的提高。5.葉輪轉(zhuǎn)速的提高有利于流場內(nèi)物料流場的均勻化和出口速度的提高。其中葉片數(shù)、葉片傾角以及葉輪轉(zhuǎn)速對裝置工作性能的影響與拋送裝置工作性能試驗(yàn)結(jié)果基本一致，進(jìn)一步驗(yàn)證了仿真結(jié)果的可靠性。本課題的研究為葉片式拋送裝置的進(jìn)一步改進(jìn)設(shè)計(jì)提供依據(jù)。
[Abstract]:Throwing device to work in order to clarify the internal material and vane airflow real flow and distribution, with the aid of CFD (ComputationalFluid Dynamic) software Fluent6.3 on the device inside the gas-solid two-phase flow field of three-dimensional numerical simulation, the pressure and velocity distribution and movement of material flow within the device to throw things the material in the process of comparative analysis and throwing device main working parameters of vane type of two-phase flow and material movement.
Based on the analysis of the leaf blower based on the working principle of the blade type Eulerian model throwing device in gas-solid two-phase flow mathematical model based on; to create three-dimensional entity model and channel model of the device, and partition mesh; determine the device in gas-solid two-phase numerical simulation method flow: the Eulerian model and the standard k- turbulence model and simple algorithm is adopted to simulate the flow field inside the device; the material velocity simulation results and literature [15] under the same conditions of high-speed camera measurement data comparison analysis, the simulation result is reliable on the basis of comparative analysis of the impact of the main parameters of the working device of material movement.
By numerical calculation, the paper concludes: 1. leaf number and leaf number was four, three and five compared to small eddy current region pressure field distribution symmetry and velocity field, the throwing performance.2. feed speed material has great influence on flow field distribution; feed speed of 13.5m/s device is not blocked, it can throw more material in unit time, throwing for higher efficiency, under the condition of optimum feed speed of.3. inlet material volume concentration changes only change the impeller and material concentration area, inlet material volume concentration and the volume of material concentration in the whole region of the greater; influence of material velocity distribution and the size is small.4. impeller blade installation angle for material throwing blades, backward 10o impeller more uniform velocity distribution, eddy current is small, is conducive to improve the efficiency of the.5. cast send impeller Is conducive to the material flow field flow field uniformity and exit velocity of raising speed increased. The leaf number, leaf angle and impeller speed effect on device performance and throwing device performance test results are basically consistent, further verify the reliability of the simulation results. This study provides a basis for further polishing blade type improved design of feeding device.

【學(xué)位授予單位】：內(nèi)蒙古工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TH238;O359

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