A large amount of experimental work has been carried out in the past tounderstand mean and fluctuating forces on a single circular cylinder in cross flows. In comparisonsubstantially less work can be found on the inte...A large amount of experimental work has been carried out in the past tounderstand mean and fluctuating forces on a single circular cylinder in cross flows. In comparisonsubstantially less work can be found on the interference between multiple cylinders and the numberof publications a-vailable becomes drastically smaller as the number of cylinders involvedincreases. The current experimental work systematically examines the wake shielding effects of threecylinders in a towing tank. Though staggered, the three cylinders are arranged mainly along theflow direction with the downstream cylinders situating in the wakes of the upstream cylinders. Thetests are mainly carried out in the sub-critical Reynolds number regime with the upper end close tothe critical Reynolds number regime. Significant drag reduction on downstream cylinders isidentified.展开更多
为设计原子光泵磁力仪中的高屏蔽效能磁屏蔽体,修正了多层磁屏蔽筒轴向屏蔽效能公式,并对比验证多层磁屏蔽筒各尺寸参数对轴向屏蔽效能的影响。对3层磁屏蔽筒模型应用Ansoft Maxwell建模仿真得到中心点磁屏蔽效能159.77 d B,公式计算结...为设计原子光泵磁力仪中的高屏蔽效能磁屏蔽体,修正了多层磁屏蔽筒轴向屏蔽效能公式,并对比验证多层磁屏蔽筒各尺寸参数对轴向屏蔽效能的影响。对3层磁屏蔽筒模型应用Ansoft Maxwell建模仿真得到中心点磁屏蔽效能159.77 d B,公式计算结果为167.5 d B,研究结果表明修正的磁屏蔽筒轴向屏蔽系数公式比现阶段研究中的屏蔽筒轴向屏蔽系数公式(170.5 d B)具有更高的准确度,且参数对磁屏蔽效能的影响趋势与仿真具有较高的一致性。在其他尺寸参数相同情况下,3层磁屏蔽筒轴向长度间隔为46.5 mm时,轴向屏蔽效能存在最优值167.486 d B,在地磁场环境中剩磁小于0.6 p T,对磁屏蔽筒的尺寸设计具有重要指导意义。展开更多
文摘A large amount of experimental work has been carried out in the past tounderstand mean and fluctuating forces on a single circular cylinder in cross flows. In comparisonsubstantially less work can be found on the interference between multiple cylinders and the numberof publications a-vailable becomes drastically smaller as the number of cylinders involvedincreases. The current experimental work systematically examines the wake shielding effects of threecylinders in a towing tank. Though staggered, the three cylinders are arranged mainly along theflow direction with the downstream cylinders situating in the wakes of the upstream cylinders. Thetests are mainly carried out in the sub-critical Reynolds number regime with the upper end close tothe critical Reynolds number regime. Significant drag reduction on downstream cylinders isidentified.
文摘为设计原子光泵磁力仪中的高屏蔽效能磁屏蔽体,修正了多层磁屏蔽筒轴向屏蔽效能公式,并对比验证多层磁屏蔽筒各尺寸参数对轴向屏蔽效能的影响。对3层磁屏蔽筒模型应用Ansoft Maxwell建模仿真得到中心点磁屏蔽效能159.77 d B,公式计算结果为167.5 d B,研究结果表明修正的磁屏蔽筒轴向屏蔽系数公式比现阶段研究中的屏蔽筒轴向屏蔽系数公式(170.5 d B)具有更高的准确度,且参数对磁屏蔽效能的影响趋势与仿真具有较高的一致性。在其他尺寸参数相同情况下,3层磁屏蔽筒轴向长度间隔为46.5 mm时,轴向屏蔽效能存在最优值167.486 d B,在地磁场环境中剩磁小于0.6 p T,对磁屏蔽筒的尺寸设计具有重要指导意义。
