【摘要】：為了研究泵與透平換算系數(shù)隨黏度與比轉數(shù)的變化規(guī)律,選用5臺不同比轉數(shù)離心泵反轉作透平,在5種不同的介質黏度下,對透平工況進行數(shù)值模擬.根據(jù)數(shù)值模擬結果,擬合求得透平的壓頭、效率與流量的關系式.通過對透平效率-流量關系式的求導,可得到透平在最優(yōu)效率點處的流量、壓頭.據(jù)此可以求得泵反轉作透平時,透平在黏性介質時的最優(yōu)工況下的流量、壓頭與水泵在清水介質最優(yōu)工況下流量、揚程之間的換算系數(shù).通過黏性介質下透平的水力效率、壓頭與流量關系曲線發(fā)現(xiàn):介質黏度對透平性能的影響較大,隨介質黏度的增大,透平的水力效率明顯下降.比較不同比轉數(shù)下的換算關系隨黏度變化曲線圖可發(fā)現(xiàn):對于同一比轉速的透平,換算系數(shù)均隨黏度的增大而增大;而當介質黏度相同時,隨著比轉數(shù)的增大,流量、揚程換算系數(shù)大體呈減小趨勢.
[Abstract]:In order to study the change rule of conversion coefficient between pump and turbine with viscosity and specific rotation number, five centrifugal pumps with different specific rotation numbers were selected to reverse the turbine, and the turbine working conditions were simulated under five different medium viscosity. According to the results of numerical simulation, the relationship between pressure head, efficiency and flow rate of turbine is obtained by fitting. Through the derivation of the relationship between turbine efficiency and flow rate, the flow rate and pressure head of the turbine at the optimum efficiency point can be obtained. On the basis of this, the conversion coefficient between the flow rate of turbine and pump under the optimal condition of viscous medium, the flow rate of pump and pump under the optimal condition of clean water medium can be obtained. Through the hydraulic efficiency of turbine under viscous medium and the relation curve between pressure head and flow rate, it is found that the influence of medium viscosity on turbine performance is great, and the hydraulic efficiency of turbine decreases obviously with the increase of medium viscosity. Comparing the curves of conversion relationship with viscosity under different specific rotation numbers, it can be found that the conversion coefficient increases with the increase of viscosity for the turbine with the same specific speed. However, when the viscosity of the medium is the same, with the increase of the specific rotation number, the flow rate and the head conversion coefficient tend to decrease.
【作者單位】： 蘭州理工大學能源與動力工程學院;甘肅省流體機械及系統(tǒng)重點實驗室;
【基金】：國家自然科學基金資助項目(51569013)
【分類號】：TH311

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