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xchzh3605: 金幣+20, 基金HEPI+1, ★★★★★最佳答案 2012-09-05 13:37:41
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搖臂式噴頭全流道湍流數(shù)值模擬與試驗研究 批準(zhǔn)號 50509024 學(xué)科代碼1 農(nóng)業(yè)水利(E0902) 學(xué)科代碼2 負(fù)責(zé)人 嚴(yán)海軍 職稱 講師 全文 上傳全文(獲50丁當(dāng)) 單位名稱 中國農(nóng)業(yè)大學(xué) 資助金額 22萬元 研究性質(zhì) 應(yīng)用基礎(chǔ)研究 起止年月 2006-01-01 - 2008-12-31 項目類別 青年科學(xué)基金項目 亞類說明 附注說明 摘要 參與人 全部 摘要 申請書摘要 噴頭是組成噴灌機組和噴灌系統(tǒng)的關(guān)鍵設(shè)備，其類型與結(jié)構(gòu)繁多，但噴頭設(shè)計目前尚處于半經(jīng)驗半理論階段。本項目擬以應(yīng)用最廣的搖臂式噴頭為研究對象，將計算流體動力學(xué)（CFD）、計算結(jié)構(gòu)動力學(xué)（CSD）及流固耦合力學(xué)、粒子成像速度場儀（PIV）等相關(guān)理論與技術(shù)應(yīng)用于噴頭過水流道內(nèi)部湍流流動、噴嘴出口自由湍射流及其與導(dǎo)流器之間流固耦合作用、搖臂受力等研究，為揭示搖臂式噴頭全流道湍流流動機理及動力學(xué)分析提供了一種 申請書主題詞 搖臂式噴頭;全流道;湍流;數(shù)值模擬;試驗 結(jié)題中文摘要 搖臂式噴頭是噴灌系統(tǒng)的關(guān)鍵設(shè)備之一，本課題主要開展了搖臂式噴頭內(nèi)部和外部流道流動試驗和數(shù)值模擬研究，研究對象是PY系列搖臂式噴頭。通過對不同規(guī)格的穩(wěn)流器和噴嘴組合下PY140搖臂式噴頭內(nèi)流道的穩(wěn)態(tài)和非穩(wěn)態(tài)流動試驗，得到了噴頭內(nèi)流道阻力損失、通過流量的變化規(guī)律及其與內(nèi)流道結(jié)構(gòu)參數(shù)、進口工作壓力之間關(guān)系的數(shù)學(xué)模型；建立了PY1-40搖臂式噴頭內(nèi)流道流動三維湍流模型和數(shù)值模擬計算方法，對不同噴嘴結(jié)構(gòu)及內(nèi)流道安裝穩(wěn)流器與否的多種組合工況進行了數(shù)值模擬，并與試驗結(jié)果進行比較，提出內(nèi)流道的優(yōu)化結(jié)構(gòu)；應(yīng)用高速數(shù)碼攝影技術(shù)對PY1-30、PY1-40搖臂式噴頭的導(dǎo)流器運動特性進行了試驗研究，獲取了搖臂式噴頭在正反轉(zhuǎn)過程中運動參數(shù)的變化規(guī)律；建立了搖臂式噴頭外部流動二維數(shù)值模擬計算方法，獲得了噴頭外部流動流場分布及導(dǎo)流器的力學(xué)特性，初步模擬了噴頭外部水滴的碎裂及霧化的變化過程；建立了搖臂式噴頭搖臂繞軸旋轉(zhuǎn)、碰撞噴體的有限元計算方法，對不同轉(zhuǎn)動角速度和噴體安裝彈性橡膠墊與否等組合工況下?lián)u臂與噴體碰撞過程及動應(yīng)力分布進行了計算模擬，數(shù)值模擬結(jié)果與試驗及解析求解結(jié)果非常接近。 結(jié)題英文摘要 Impact sprinkler is one of the key equipments of the sprinkler irrigation system. The project mainly conducted experimental and numerical simulation research for the internal and external flow passage of the impace sprinkler. The studied object is the PY series impact sprinkler. Based on the steady-state and unsteady-state internal flow tests of the PY1-40 impact sprinkler fixed with different combinations of flow straighteners and nozzles, some mathematical models describing the pressure loss within the internal passage, sprinkler flow rate with the structural parameters of the internal passage and inlet working pressure were established. The 3-D turbulent flow model and numerical simulation method for the internal flow passage of the PY1-40 impact sprinkler were presented. Several simulations of internal flow passage with different flow straighteners as well as without flow straightener were investigated and compared with experiments. By using the high speed photography technique, an experiment study on the movement characteristics of the PY1-30 and PY1-40 impact sprinkler's swing arm was conducted and some important movement parameters both in the positive and reverse rotations were obtained. A 2-D numerical simulation on the external flow and the driven spoon's mechanical properties of the impact sprinkler was established. A preliminary simulation on the generation and change of the water droplet was obtained. A finite-element method for solving the dynamic stress distribution of the swing arm was established. Several cases with different rotating angular velocities and with or without the rubber pad fixed on the sprinkler tube's limit stop were investigated. The simulated results were very close to the measured and calclulated data. |
2樓2012-09-05 11:17:22
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3樓2012-09-11 01:20:48
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