He二维射流阵列放电模式转换条件实验

为获得高强度和大面积大气压下等离子体射流,利用类蜂巢状电极结构,在大气压He中获得了两种不同模式的二维射流阵列放电,比较了它们的放电特性,并研究了气流速度、射流单元之间距离和外加电压幅值等参数对射流阵列模式转换的影响。结果表明,He中射流阵列在一定条件下会出现具有较高放电强度的强耦合模式和具有较大放电面积的均匀模式两种放电模式,相同的外加电压幅值下,强耦合模式阵列的放电功率、传输电荷和主要粒子谱线强度均高于均匀模式。射流单元之间距离和气体流速是影响射流阵列模式转换的主要决定因素,外加电压的变化只会影响到放电强度而不会影响到射流阵列的放电模式。射流单元之间距离为0.2mm,流速小于5L/min时,放电模式为强耦合模式;流速大于5L/min放电转换到均匀模式;当射流单元之间的距离超过0.4mm时,放电只出现均匀模式。

新型扭转冲击钻井工具的研制与应用

针对临兴PSC区块致密砂岩胶结致密、硬度高、研磨性强及可钻性差等特点,研发了一种新型扭转冲击钻井工具;钻进过程中,利用高压流体在射流单元中的附壁和换向自然特性,造成活塞切向敲击下接头,这样给PDC钻头施加一个周期性切向冲击载荷,增加PDC钻头剪切破岩能量,提高机械钻速和减缓PDC钻头粘滑振动。现场应用结果表明:该工具平均机械钻速较邻井提高了152%,有效降低钻井成本。

Research of chemical induction unit on mixing effect and chlorine saving

Rapid mixing and chlorine saving are two important problems that most drinking water industries are focus on, and this paper adopts chemical induction unit to compare with water jet injector to study what merits chemical induction unit has. The experiment chose coefficient of variability of chlorine concentration to evaluate the mix effect and used chlorine consumption to compare the two equipments. Distribution reservoir experiments show that chemical induction unit can completely mix chlorine less than 6.2 seconds and water jet injector can not completely mix in 3 minutes. Mixing pool experiments show that chemical induction unit can save chlorine compared with water jet injector, and can save more if more chlorine is consumed.