本文關(guān)鍵詞：半高導(dǎo)葉端面間隙對(duì)離心泵水力性能影響的數(shù)值模擬與驗(yàn)證　出處：《農(nóng)業(yè)工程學(xué)報(bào)》2017年17期 　論文類型：期刊論文

  更多相關(guān)文章： 離心泵 水力模型 性能 總壓損失 動(dòng)靜干涉

【摘要】：離心泵中存在各種間隙,其間隙流動(dòng)極其復(fù)雜,易出現(xiàn)泄漏流、間隙渦等復(fù)雜湍流,影響離心泵的水力性能及運(yùn)行穩(wěn)定性。該文結(jié)合數(shù)值模擬與試驗(yàn)方法,采用SST k ω湍流模型,研究半高導(dǎo)葉端面間隙對(duì)離心泵水力性能及內(nèi)部流場(chǎng)的影響規(guī)律,重點(diǎn)探討半高導(dǎo)葉端面間隙對(duì)離心泵水力性能的影響機(jī)理。結(jié)果表明,適當(dāng)?shù)陌敫邔?dǎo)葉端面間隙能有效改善離心泵水力性能,拓寬其高效區(qū),導(dǎo)葉葉高為1.0時(shí),最高效率點(diǎn)流量37.5 m3/h處,而導(dǎo)葉葉高為0~0.8時(shí),其最高效率點(diǎn)流量42.5 m3/h處;導(dǎo)葉端面間隙為0.4~0.6導(dǎo)葉葉高時(shí),離心泵的效率與揚(yáng)程最優(yōu),且最大效率為57.5%;在0.6倍設(shè)計(jì)工況、0.8倍設(shè)計(jì)工況和1.0倍設(shè)計(jì)工況時(shí),帶半高導(dǎo)葉端面間隙的離心泵中葉輪做功和導(dǎo)葉內(nèi)總壓損失均高于普通導(dǎo)葉式離心泵,在0.6倍設(shè)計(jì)工況,導(dǎo)葉葉高為1.0時(shí)葉輪做功比導(dǎo)葉葉高為0~0.8時(shí)葉輪做功低將近7 m水頭,且在0.6倍設(shè)計(jì)工況和0.8倍設(shè)計(jì)工況下,導(dǎo)葉葉高為0時(shí)導(dǎo)葉內(nèi)總壓損失平均值比導(dǎo)葉葉高為1.0時(shí)分別高6.66 m、4.62 m水頭;在1.2倍設(shè)計(jì)工況和1.4倍設(shè)計(jì)工況時(shí),其葉輪做功和導(dǎo)葉內(nèi)總壓損失均低于普通導(dǎo)葉式離心泵;在各流量工況下,帶導(dǎo)葉端面間隙的離心泵中蝸殼內(nèi)總壓損失均小于普通導(dǎo)葉式離心泵;隨著流量增加,帶半高導(dǎo)葉端面間隙的離心泵中葉輪-導(dǎo)葉動(dòng)靜干涉作用在逐漸減弱,葉輪-蝸殼動(dòng)靜干涉作用逐漸凸顯。研究結(jié)果為離心泵導(dǎo)葉優(yōu)化設(shè)計(jì)提供參考。
[Abstract]:There are various clearances in the centrifugal pump, the clearance flow is extremely complex, the leakage flow, clearance vortex and other complex turbulence, which affect the hydraulic performance and operational stability of the centrifugal pump. This paper combines the numerical simulation and test methods. The effect of the end clearance of semi-high guide vane on the hydraulic performance and internal flow field of centrifugal pump was studied by using the SST Ki 蠅 turbulence model. The influence mechanism of the end clearance of semi-high guide vane on the hydraulic performance of centrifugal pump is discussed. The results show that the proper end clearance of semi-high guide vane can effectively improve the hydraulic performance of centrifugal pump and widen its high efficiency area. When the height of the guide blade is 1.0, the flow rate of the highest efficiency point is 37.5 m3 / h, and when the height of the guide blade is 0 ~ 0.8, the flow rate of the highest efficiency point is 42.5 m3 / h. The efficiency and lift of centrifugal pump are optimal when the end clearance of guide vane is 0.4 ~ 0.6 and the maximum efficiency is 57.5; At 0.6 times design condition, 0.8 times design condition and 1.0 times design condition, the work of impeller and total pressure loss of guide vane in centrifugal pump with semi-high clearance of guide vane end face are higher than that of ordinary guide vane centrifugal pump. When the guide blade height is 1.0, the work of the impeller is nearly 7 meters lower than that of the guide vane when the height of the guide vane is 0 ~ 0.8, and under 0.6 and 0.8 times design conditions. When the height of the guide blade is 0:00, the average of the total pressure loss of the guide blade is 6.66 m and 4.62 m higher than that of the guide blade when the height of the guide blade is 1.0; When the design conditions are 1.2 times and 1.4 times, the impeller work and the total pressure loss of the guide vane are lower than that of the ordinary guide vane centrifugal pump. Under each flow condition, the total pressure loss in the volute of the centrifugal pump with guide vane end clearance is smaller than that of the ordinary guide vane centrifugal pump. With the increase of flow rate, the impeller-guide blade static and static interference in centrifugal pump with semi-high clearance of guide vane is gradually weakened. The effect of impeller-volute dynamic and static interference is becoming more and more prominent. The results provide a reference for the optimization design of centrifugal pump guide vane.
【作者單位】： 西北農(nóng)林科技大學(xué)水利與建筑工程學(xué)院;
【基金】：國家自然基金(51479173,51509209) 西北農(nóng)林科技大學(xué)科研啟動(dòng)經(jīng)費(fèi)(Z109021642) 陜西水利科技計(jì)劃項(xiàng)目(2017slkj-5) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(Z109021705)
【分類號(hào)】：TH311
【正文快照】： 0引言P衾胄謀霉惴旱撓τ糜諢ぁ⒑說紜⑹�、航虜倘领宇RＫ孀派緇嶠接肟萍擠⒄，

本文編號(hào)：1361206