本文選題：斷齒式螺旋 + 間斷距離��； 參考：《農(nóng)業(yè)機械學(xué)報》2017年10期

【摘要】：為了探討在間斷距離影響下斷齒式螺旋流道的脫水性能,采用雙流體模型對斷齒螺旋在20、35、50 mm 3種間斷距離下的流場進行數(shù)值模擬,對比分析了3種結(jié)構(gòu)參數(shù)模型下斷齒式螺旋脫水裝置工作性能、流道內(nèi)顆粒濃度分布、顆粒速度分布及多孔介質(zhì)區(qū)域內(nèi)外壓差分布情況。研究表明,數(shù)值模擬結(jié)果能夠較為準(zhǔn)確地推測斷齒式螺旋擠壓脫水裝置的內(nèi)部流動特性。50 mm間斷距離下斷齒式螺旋擠壓脫水裝置工作效率最大下降了7.9%,20 mm間斷距離下出渣口顆粒體積分?jǐn)?shù)下降3.2%;流道內(nèi)顆粒體積分?jǐn)?shù)變化分3個階段,整體呈波浪型遞增式趨勢,間斷長度對腔體內(nèi)部流態(tài)影響較大。間斷區(qū)對顆粒運動具有一定的緩沖作用,間斷距離長短能夠控制顆粒在腔體內(nèi)的滯留時間。多孔介質(zhì)區(qū)域內(nèi)外側(cè)壓差在脫水后期增幅最大,相同工況下間斷距離越小壓差越大。本次模擬計算下最優(yōu)間斷距離為35 mm、出渣口壓力為5 000 Pa、轉(zhuǎn)速為50 r/min。該研究可為斷齒式螺旋擠壓脫水裝置的設(shè)計提供參考。
[Abstract]:In order to investigate the dewatering performance of broken tooth helical runner under the influence of discontinuous distance, a two-fluid model was used to simulate the flow field of broken tooth helix at three discontinuous distances of 205mm. The working performance, particle concentration distribution, particle velocity distribution and pressure difference distribution inside and outside the porous media region of the helical dewatering device with broken teeth under three structural parameter models were compared and analyzed. Research shows that The numerical simulation results can accurately predict the internal flow characteristics of the broken tooth screw extrusion dehydration device. The working efficiency of the broken tooth screw extrusion dehydration device under the discontinuous distance of 50 mm decreases the maximum working efficiency of the broken tooth screw extrusion dehydration device and decreases the slag outlet at the discontinuous distance of 7.9 mm to 20 mm. The particle volume fraction decreased by 3.2 and the change of particle volume fraction in the channel was divided into three stages. The whole body shows a wave-type increasing trend, and the length of discontinuity has a great influence on the internal flow state of the cavity. The discontinuous region has a certain buffer effect on the particle movement, and the length of the discontinuous distance can control the retention time of the particle in the cavity. The pressure difference between the inner and outer side of porous media is the largest in the later stage of dehydration, and the smaller the discontinuous distance is under the same working condition, the greater the pressure difference is. The optimal discontinuous distance is 35 mm, the slag outlet pressure is 5 000 Paand the rotational speed is 50 r / min. This study can be used as a reference for the design of screw extrusion dehydration device with broken teeth.
【作者單位】： 農(nóng)業(yè)部南京農(nóng)業(yè)機械化研究所;安徽農(nóng)業(yè)大學(xué)工學(xué)院;
【基金】：農(nóng)業(yè)部公益性行業(yè)科研專項(201403019) 江蘇省自然科學(xué)基金項目(BK20151073)
【分類號】：TH69
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本文編號：1818309