本文選題：水泵水輪機(jī) + 旋轉(zhuǎn)失速��； 參考：《水利學(xué)報(bào)》2017年07期

【摘要】：水泵水輪機(jī)在泵工況部分負(fù)荷下運(yùn)行,葉道內(nèi)易發(fā)生旋轉(zhuǎn)失速,可誘發(fā)劇烈的低頻壓力脈動(dòng),嚴(yán)重影響水電站的安全穩(wěn)定運(yùn)行。本文采用尺度自適應(yīng)(SST-SAS)湍流模型對(duì)某模型水泵水輪機(jī)泵工況進(jìn)行全流道非定常數(shù)值模擬,得到不同工況點(diǎn)下旋轉(zhuǎn)失速引起的壓力脈動(dòng)特性及失速渦團(tuán)的周向轉(zhuǎn)動(dòng)機(jī)理。結(jié)果顯示,在40%~80%設(shè)計(jì)流量下運(yùn)行時(shí),導(dǎo)葉區(qū)發(fā)生旋轉(zhuǎn)失速,失速渦團(tuán)的轉(zhuǎn)動(dòng)頻率為葉輪轉(zhuǎn)頻的3.3%~8.1%。旋轉(zhuǎn)失速發(fā)展強(qiáng)度越劇烈,轉(zhuǎn)動(dòng)越慢。旋轉(zhuǎn)失速周向轉(zhuǎn)動(dòng)的機(jī)理是:失速與非失速相鄰導(dǎo)葉流道內(nèi)存在較大壓力梯度,在其作用下,失速流道內(nèi)流體從活動(dòng)導(dǎo)葉與固定導(dǎo)葉之間通道流向非失速流道,加劇非失速流道內(nèi)流動(dòng)分離。被阻礙的水流與無(wú)葉區(qū)主流疊加流向下一流道,并在活動(dòng)導(dǎo)葉吸力面進(jìn)口前緣產(chǎn)生局部低壓,導(dǎo)致當(dāng)前非失速活動(dòng)導(dǎo)葉流道在進(jìn)口與出口之間的逆壓梯度增強(qiáng),使流體反向流動(dòng),流道產(chǎn)生失速。
[Abstract]:When the pump turbine operates under the partial load of the pump condition, the rotating stall is easy to occur in the impeller duct, which can induce severe low frequency pressure pulsation and seriously affect the safe and stable operation of the hydropower station. In this paper, the full-channel unsteady numerical simulation of a model pump is carried out by using the scale adaptive SST-SAS turbulence model, and the pressure pulsation characteristics and the circumferential rotation mechanism of the stall vortex mass are obtained at different working conditions. The results show that when running at 40% of the designed flow rate, the rotating stall occurs in the guide vane area, and the rotational frequency of the stall vortex mass is 3.3% and 8.1% of the rotating frequency of the impeller. The more intense the rotating stall, the slower the rotation. The mechanism of circumferential rotation of rotating stall is as follows: there is a large pressure gradient in the channel of the stall and non-stall adjacent guide vane, under which the flow in the stall passage flows from the channel between the moving guide vane and the fixed guide vane to the non-stall channel. Aggravation of flow separation in non-stall channels. The blocked flow superposed with the mainstream of the leafless zone to the next channel and produced a local low pressure at the leading edge of the inlet of the suction surface of the active guide vane, resulting in an increase in the reverse pressure gradient between the inlet and outlet of the current non-stall active guide vane channel. Causes the fluid to flow backward, the passage produces the stall.
【作者單位】： 重慶交通大學(xué)西南水運(yùn)工程科學(xué)研究所;武漢大學(xué)水資源與水電科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目(51579187) 重慶市基礎(chǔ)與前沿研究計(jì)劃項(xiàng)目(cstc2016jcyj A1935,cstc2016jcyj A1937) 重慶市教委科學(xué)技術(shù)研究項(xiàng)目(KJ1600514,KJ1600535) 重慶交通大學(xué)內(nèi)河航道整治技術(shù)交通行業(yè)重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金重點(diǎn)項(xiàng)目(NHHD-201501,NHHD-201505,NHHD-201513)
【分類號(hào)】：TV675

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