为了改善柴油机D6114喷油嘴291 DLLA150 FC PV01内部燃油流动状况,使喷入气缸内的燃油达到较好的雾化质量,在原有喷嘴基础上,针对喷嘴结构参数长径比、喷嘴入口过渡圆角及喷孔锥角设计了9种方案。在CFD(计算流体动力学)软件中建立了喷...为了改善柴油机D6114喷油嘴291 DLLA150 FC PV01内部燃油流动状况,使喷入气缸内的燃油达到较好的雾化质量,在原有喷嘴基础上,针对喷嘴结构参数长径比、喷嘴入口过渡圆角及喷孔锥角设计了9种方案。在CFD(计算流体动力学)软件中建立了喷嘴内部流场的三维模型,对整个流场区域进行了流体动力学模拟计算。分析了喷嘴结构参数对喷孔内部空化程度、湍动能及流速的影响,得出:随着长径比(L/D)的减小,燃油在喷孔中的空化程度增强,湍动能减小,流速增加;随着过渡圆角与直径比(r/D)的增大,喷孔内部流体空化程度增强,流速增大,湍动能减弱;随着喷孔锥角(θ)的增大,喷孔内燃油空化程度加强,湍动能减弱。展开更多
Currently, rotary drilling machines and relative construction technology have been known gradually. They were widely applied in the big diameter drilling compresol pile construction in North China. But the application...Currently, rotary drilling machines and relative construction technology have been known gradually. They were widely applied in the big diameter drilling compresol pile construction in North China. But the application of the rotary drilling machines is limited in South China, especially the southeast area, because of the soft soil and the big scale of pile. On the other hand, impact hammers have been widely used in drilling pile construction in mollisol area. Recently, rotary drilling machines and impact hammer are working together in several projects in mollisol area to prove its feasibility. This article introduces the construction instance using rotary drilling machines together with impact hammer in the drilling compresol pile construction of Wushashan Power Plant in Datang town of Zhejiang Province. Besides, the advantages and the feasibility were listed.展开更多
文摘为了改善柴油机D6114喷油嘴291 DLLA150 FC PV01内部燃油流动状况,使喷入气缸内的燃油达到较好的雾化质量,在原有喷嘴基础上,针对喷嘴结构参数长径比、喷嘴入口过渡圆角及喷孔锥角设计了9种方案。在CFD(计算流体动力学)软件中建立了喷嘴内部流场的三维模型,对整个流场区域进行了流体动力学模拟计算。分析了喷嘴结构参数对喷孔内部空化程度、湍动能及流速的影响,得出:随着长径比(L/D)的减小,燃油在喷孔中的空化程度增强,湍动能减小,流速增加;随着过渡圆角与直径比(r/D)的增大,喷孔内部流体空化程度增强,流速增大,湍动能减弱;随着喷孔锥角(θ)的增大,喷孔内燃油空化程度加强,湍动能减弱。
文摘Currently, rotary drilling machines and relative construction technology have been known gradually. They were widely applied in the big diameter drilling compresol pile construction in North China. But the application of the rotary drilling machines is limited in South China, especially the southeast area, because of the soft soil and the big scale of pile. On the other hand, impact hammers have been widely used in drilling pile construction in mollisol area. Recently, rotary drilling machines and impact hammer are working together in several projects in mollisol area to prove its feasibility. This article introduces the construction instance using rotary drilling machines together with impact hammer in the drilling compresol pile construction of Wushashan Power Plant in Datang town of Zhejiang Province. Besides, the advantages and the feasibility were listed.
