1) destruction of turbulence
紊流衰减
2) turbulent drag reduction
紊流减阻
1.
Based on the confirmation of the turbulent drag reduction effect of flexible tubes,an experimental study was conducted on the drag reduction effect by self-excited vibration of flexible tubes with a double-sleeve structure.
在实验确认柔性管紊流减阻效果的基础上,采用双重管结构,对柔性管的自激振动减阻效果进行了实验研究。
2.
Based on there existing the effect of turbulent drag reduction in flexible tubes examined by experiment, the experimental investigation was performed on effect of turbulent drag reduction and character of flow-excited vibration.
在实验确认弹性管确有紊流减阻效果的基础上,对其流激振动特性及紊流减阻效果进行了实验研究。
3) flow rate attenuation
流速衰减
4) discharge attenuation
流量衰减
1.
The trend of the spring discharge attenuation was given based on water dynamics in Xin an Spring.
通过对辛安泉的泉水动态分析,获得了泉流量衰减变化的趋势。
2.
The karst multi-media structure is high heterogeneity,and the outflow process is simulated by using laboratory experiment,especially the discharge attenuation process is deeply analyzed.
本文借助室内实验装置,模拟了结构不均匀的岩溶多重介质的出流过程,并着重对流量衰减过程进行了分析。
5) runoff decline
径流衰减
6) decaying DC component
衰减直流
1.
New approach for fault line selection in distribution system with arc suppressing coil grounding using decaying DC component;
一种利用衰减直流分量的谐振接地系统故障选线方法
补充资料：高分子减阻剂
| 高分子减阻剂 polymeric drag-reduction additives 具有减小流体流动阻力作用的高分子。在流体输送过程中加入此类高分子，能减少转展阻力，降低能耗。水相输送减阻剂研究开发较早，已研究了大量的水溶性高分子减阻剂，使用量仅几个ppm就可降低50％以上的阻力，有时高达80％。高分子减阻剂的结构及性质是：高分子具有无支链结构，分子量高，溶解性好等。聚环氧乙烷、聚丙烯酰胺是良好的水相减阻剂。油相减阻剂具有重要的实际意义，原油多以管道输送。由于粘度大、摩擦力高，输送中消耗也高，已应用的油相减阻剂有聚异丁烯、氢化聚异戊二烯、无规聚丙烯、丁二烯及苯乙烯的嵌段共聚物、乙烯与乙烯基酯的共聚物聚丙烯酰胺、乙烯和丙烯的共聚物等。如氢化聚异戊二烯，一般用量2～20ppm，即可使流速增加，摩擦损耗降低27％到50％。高分子减阻剂已广泛用于灌溉、泄洪、消防、原油输送等方面。其缺点是价格贵、易降解等。 |
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条