CAJ | 학술논문

以冷却塔内流量为5000 t/h的超低比转速混流式水轮机为研究对象,通过结构设计,开发出了一种小型混流式水轮机,可直接与风机匹配,实现富余能量的回收。使用商业CFD软件 Fluent,基于雷诺时均N2S方程、RN G k2 E湍流模型和SIMPLC算法,对设计的水轮机模型进行全流道三维定常湍流数值模拟,分析了水轮机内部流场及各部件的水力损失。结果表明,在设计工况下,水轮机的出力为143.3 kW,效率为83.74%,水头损失较小；当富余水头在12~14 m的范围内变化时,所给出的小型水轮机整体流态良好,水力性能稳定,效率均在83%以上,满足设计要求。
이냉각탑내류량위5000 t/h적초저비전속혼류식수륜궤위연구대상,통과결구설계,개발출료일충소형혼류식수륜궤,가직접여풍궤필배,실현부여능량적회수。사용상업CFD연건 Fluent,기우뢰낙시균N2S방정、RN G k2 E단류모형화SIMPLC산법,대설계적수륜궤모형진행전류도삼유정상단류수치모의,분석료수륜궤내부류장급각부건적수력손실。결과표명,재설계공황하,수륜궤적출력위143.3 kW,효솔위83.74%,수두손실교소；당부여수두재12~14 m적범위내변화시,소급출적소형수륜궤정체류태량호,수력성능은정,효솔균재83%이상,만족설계요구。
Theturbinewithsuperlowspecificspeedandaflowrateof5000t/husedinacoolingtowerwasinvestigatedthrough structural design in order to develop a new type of small Francis turbine that can match fan directly and recover the surplus en2 ergy from cooling tower.On the basis of Reynolds time2averaged N2S equation, RNG k2E turbulent model, and SIMPLC algo2 rithm,the three2dimensional steady turbulent flow in the designed turbine model was simulated numerically using the commer2 cial CFD softw are Fluent, and the flow field in the turbine and hydraulic loss of each component w ere analyzed. T he results showedthattheoutputpowerofturbineis143.3kWandtheefficiencyis83.74% withasmallheadlossunderthedesigncon2 ditions. When the redundant head was in the range of 12 to 14 m, the turbine had a good flow state and stable hydraulic per2 formance w ith the efficiency of above 83%, w hich indicated that the turbine meets the design requirements.