發(fā)布時(shí)間：2018-07-16 08:42

【摘要】：為研究葉輪切割對(duì)回收液力透平性能的影響,選取比轉(zhuǎn)速分別為46.0、55.7、63.2的離心泵反轉(zhuǎn)作回收液力透平,對(duì)各個(gè)葉輪外徑進(jìn)行四次切割,應(yīng)用CFD軟件對(duì)這三種比轉(zhuǎn)速液力透平在不同切割量下進(jìn)行數(shù)值計(jì)算,得到液力透平運(yùn)行的外特性曲線并分析其內(nèi)部流動(dòng)規(guī)律。結(jié)果表明,對(duì)于離心泵反轉(zhuǎn)作回收液力透平,透平的壓頭隨葉輪外徑切割量的增大而減小。在小流量工況下隨著葉輪外徑切割量的增加,葉輪內(nèi)部流動(dòng)損失逐漸減小,透平的水力效率呈現(xiàn)上升趨勢(shì);在最優(yōu)工況和大流量工況下隨著葉輪外徑切割量的增加,葉輪內(nèi)部流動(dòng)更加紊亂,產(chǎn)生較大的能量損失,透平的水力效率呈現(xiàn)下降趨勢(shì)。
[Abstract]:In order to study the effect of impeller cutting on the performance of recovered hydraulic turbine, the centrifugal pump with specific rotational speed of 46.0 ~ 55.7 / 63.2 was selected as the recovery hydraulic turbine respectively, and the outer diameter of each impeller was cut four times. By using CFD software, the external characteristic curve of hydraulic turbine is obtained and its internal flow law is analyzed. The results show that the pressure head of the turbine decreases with the increase of the cutting volume of the impeller. Under the condition of small flow rate, with the increase of the cutting rate of impeller outer diameter, the internal flow loss of impeller decreases gradually, and the hydraulic efficiency of turbine increases, while under the optimal working condition and the high flow condition, with the increase of impeller outer diameter, the flow loss of impeller decreases gradually, and the hydraulic efficiency of turbine increases with the increase of outside diameter of impeller. The internal flow of impeller is more disordered, resulting in larger energy loss, and the hydraulic efficiency of turbine decreases.
【作者單位】： 蘭州理工大學(xué)能動(dòng)學(xué)院;甘肅省流體機(jī)械及系統(tǒng)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51569013)
【分類號(hào)】：TH311

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