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搖臂式噴頭全流道湍流數(shù)值模擬與試驗(yàn)研究 批準(zhǔn)號(hào) 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(guó)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(xiàng)目類別 青年科學(xué)基金項(xiàng)目 亞類說明 附注說明 摘要 參與人 全部 摘要 申請(qǐng)書摘要 噴頭是組成噴灌機(jī)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(jì)目前尚處于半經(jīng)驗(yàn)半理論階段。本項(xiàng)目擬以應(yīng)用最廣的搖臂式噴頭為研究對(duì)象，將計(jì)算流體動(dòng)力學(xué)（CFD）、計(jì)算結(jié)構(gòu)動(dòng)力學(xué)（CSD）及流固耦合力學(xué)、粒子成像速度場(chǎng)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(dòng)、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(dòng)機(jī)理及動(dòng)力學(xué)分析提供了一種 申請(qǐng)書主題詞 搖臂式噴頭;全流道;湍流;數(shù)值模擬;試驗(yàn) 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(dòng)試驗(yàn)和數(shù)值模擬研究，研究對(duì)象是PY系列搖臂式噴頭。通過對(duì)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(dòng)試驗(yàn)，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(jìn)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(dòng)三維湍流模型和數(shù)值模擬計(jì)算方法，對(duì)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(jìn)行了數(shù)值模擬，并與試驗(yàn)結(jié)果進(jìn)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(duì)PY1-30、PY1-40搖臂式噴頭的導(dǎo)流器運(yùn)動(dòng)特性進(jìn)行了試驗(yàn)研究，獲取了搖臂式噴頭在正反轉(zhuǎn)過程中運(yùn)動(dòng)參數(shù)的變化規(guī)律；建立了搖臂式噴頭外部流動(dòng)二維數(shù)值模擬計(jì)算方法，獲得了噴頭外部流動(dòng)流場(chǎng)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(jì)算方法，對(duì)不同轉(zhuǎn)動(dòng)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(dòng)應(yīng)力分布進(jìn)行了計(jì)算模擬，數(shù)值模擬結(jié)果與試驗(yàn)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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