發(fā)布時(shí)間：2018-06-29 12:52

  本文選題：轉(zhuǎn)速 + 泵作液力透平　； 參考：《流體機(jī)械》2017年10期

【摘要】：為了明確轉(zhuǎn)速對(duì)離心泵作液力透平的性能影響,本文基于Navier-Stokes方程和標(biāo)準(zhǔn)的湍流模型,采用SIMPLE算法,應(yīng)用商業(yè)軟件ANSYS-FLUENT對(duì)轉(zhuǎn)速分別為750,1000,1500,2000和2900 r/min下的液力透平進(jìn)行了數(shù)值模擬,得到了不同轉(zhuǎn)速下液力透平的外特性曲線。結(jié)果表明:對(duì)于所研究模型而言,隨著轉(zhuǎn)速的不斷增大,液力透平最優(yōu)效率點(diǎn)的效率呈增大趨勢,但增加梯度相對(duì)較小;最優(yōu)效率點(diǎn)的流量與轉(zhuǎn)速呈線性增加的趨勢;揚(yáng)程與功率均隨著轉(zhuǎn)速的增加而增大,其中揚(yáng)程在小流量工況時(shí)增加梯度較大,而在大流量工況時(shí)增加的梯度相對(duì)較小;功率的變化規(guī)律恰好與揚(yáng)程變化規(guī)律相反,即功率隨著轉(zhuǎn)速的增大在小流量工況時(shí)增大梯度較小,而在大流量工況時(shí)急劇上升。另外,根據(jù)不同轉(zhuǎn)速下液力透平的性能特點(diǎn)得出:在小流量工況時(shí),降速對(duì)提高液力透平的效率有顯著作用,與之對(duì)應(yīng),在大流量工況運(yùn)行時(shí),增加轉(zhuǎn)速也可以提高液力透平的能量回收能力,但前提是需要保證結(jié)構(gòu)強(qiáng)度滿足要求�？傊�,該研究結(jié)果可對(duì)液力透平的經(jīng)濟(jì)運(yùn)行提供部分參考。
[Abstract]:In order to determine the effect of rotating speed on the performance of centrifugal pump hydraulic turbine, based on Navier-Stokes equation and standard turbulence model, the numerical simulation of hydraulic turbine with rotating speed of 750,0001000 / 1500 / 2000 and 2900 r/min was carried out by using simple algorithm and commercial software ANSYS-fluent, respectively. The external characteristic curve of hydraulic turbine at different rotational speeds is obtained. The results show that the efficiency of the optimal efficiency point of hydraulic turbine increases with the increase of rotational speed, but the increasing gradient is relatively small, and the flow rate and speed of the optimal efficiency point increase linearly. Both head and power increase with the increase of rotating speed, in which the gradient of lift increases in small flow condition, but the gradient in large flow condition is relatively small, and the law of power change is opposite to that of head. That is, the power increases with the increase of rotational speed in small flow conditions, but increases sharply in large flow conditions. In addition, according to the performance characteristics of hydraulic turbine at different rotational speeds, it is concluded that when the flow rate is small, the speed drop plays a significant role in improving the efficiency of the hydraulic turbine. The energy recovery ability of the hydraulic turbine can also be improved by increasing the rotational speed, but the premise is that the structural strength meets the requirements. In a word, the results can provide some reference for the economic operation of hydraulic turbine.
【作者單位】： 蘭州理工大學(xué);甘肅省流體機(jī)械及系統(tǒng)重點(diǎn)實(shí)驗(yàn)室;流體及動(dòng)力機(jī)械教育部重點(diǎn)實(shí)驗(yàn)值(西華大學(xué));
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51569013) 甘肅省科技基金計(jì)劃(17JR5RA110) 流體及動(dòng)力機(jī)械教育部重點(diǎn)實(shí)驗(yàn)室(西華大學(xué))開放基金項(xiàng)目(szjj2017-091)
【分類號(hào)】：TH311

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