CAJ | 학술논문

对几种不同型式轴流桨的推力系数进行了实验及CFD模拟研究.结果表明:四宽叶翼型桨A的推力系数最大,三窄叶翼型桨D推力系数最小;模拟结果与实验结果有很好的吻合;四宽叶翼型桨A较其它几种轴流桨形成的全釜大循环更为彻底,没有发生分区现象;四宽叶翼型桨A在叶端线上的最大轴向速度远大于其它4种桨;四宽叶翼型桨A最大轴向速度随着r/R的增大而逐渐减小且逐渐向釜底方向移动.在水体系中的实验结果表明:当通气量Q_g为1.1 vvm,P/V≥1.5 kW/m~3时,四宽叶翼型桨A-透平桨组合的传质系数较双层透平桨组合高约9.6%.
대궤충불동형식축류장적추력계수진행료실험급CFD모의연구.결과표명:사관협익형장A적추력계수최대,삼착협익형장D추력계수최소;모의결과여실험결과유흔호적문합;사관협익형장A교기타궤충축류장형성적전부대순배경위철저,몰유발생분구현상;사관협익형장A재협단선상적최대축향속도원대우기타4충장;사관협익형장A최대축향속도수착r/R적증대이축점감소차축점향부저방향이동.재수체계중적실험결과표명:당통기량Q_g위1.1 vvm,P/V≥1.5 kW/m~3시,사관협익형장A-투평장조합적전질계수교쌍층투평장조합고약9.6%.
The thrust coefficient of different hydrofoil impellers was experimentally studied and simulated with CFD.Results showed that the thrust coefficient of four-broad-blade hydrofoil A is the largest,and that of three-narrow-blade hydrofoil D is the smallest.The simulation results axe in good agreement with experiment.Compared with other axial impellers,four-broad-blade hydrofoil A produces a fully developed circulation.The maximum axial velocity of four-broad-blade hydrofoil A is the biggest in these impellers at the vertical line of blade tip.The maximum axial velocity of four-broad-blade hydrofoil A gradually declines with the increase of r/R,and moves toward the bottom of the tank.Experimental results in water system indicated that the mass transfer coefficient (k_Lα) of four-broad-blade hydrofoil A-Rushton turbine (HF-A-RT) is 9.6% higher than that of Rushton turbine-Rushton turbine (RT-RT) when gas aerated rate is 1.1 vvm and the power consumption per volume (P/V) is not less than 1.5 kW/m~3.