發(fā)布時(shí)間：2018-06-23 00:14

  本文選題：小底坡 + 突擴(kuò)突跌�。� 參考：《水力發(fā)電學(xué)報(bào)》2017年07期

【摘要】：小底坡條件下,在高水頭有壓弧形門(mén)后采用突擴(kuò)突跌體型兼作摻氣措施使用時(shí),摻氣空腔容易積水,而且主流水舌受側(cè)墻擠壓后越出水面,形成較高折沖水翅現(xiàn)象。采用流動(dòng)特征分析與模型試驗(yàn)相結(jié)合的方法,認(rèn)為空腔積水及折沖水翅的主要原因是兩個(gè)"積水源"和一個(gè)"退水機(jī)制",強(qiáng)調(diào)了使射流沖擊角最小化對(duì)空腔穩(wěn)定及消除水翅問(wèn)題起關(guān)鍵作用。在試驗(yàn)結(jié)構(gòu)優(yōu)化及對(duì)比分析的基礎(chǔ)上,給出一種局部變坡消退空腔積水及改善折沖水翅的方法,同時(shí)探討了底空腔及側(cè)空腔的相互關(guān)系以及摻氣效果的影響因素。結(jié)合具體工程,驗(yàn)證了優(yōu)化體型沿程摻氣濃度及對(duì)運(yùn)行水頭的適應(yīng)能力。
[Abstract]:Under the condition of small bottom slope, the aeration cavity is easy to accumulate water and the mainstream water tongue can cross the water surface after the pressure arc door with high head, when the sudden expansion and falling shape are used as aeration measures, and the mainstream water tongue is extruded by the side wall, which forms the phenomenon of high flushing wings. Using the method of flow characteristic analysis and model test, It is considered that the main causes of cavity hydrops and flushing wings are two "water sources" and one "water receding mechanism". It is emphasized that minimizing jet impingement angle plays a key role in cavity stability and eliminating water wing problem. On the basis of experimental structure optimization and comparative analysis, this paper presents a method of local variable slope regression of cavity hydrops and improvement of flushing wing, and also discusses the relationship between bottom cavity and side cavity and the influence factors of aeration effect. Combined with the concrete project, the optimized aeration concentration along the range and the adaptability to the running head are verified.
【作者單位】： 南京水利科學(xué)研究院水文水資源與水利工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;河海大學(xué)水利水電學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51379128) 國(guó)家國(guó)際科技合作專項(xiàng)(2015DFA01000)
【分類號(hào)】：TV135.2
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本文編號(hào)：2054851