...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Fluid Flow >Experimental investigation of the turbulent wake past real seabed elements for velocity variations characterization in the water column
【24h】

Experimental investigation of the turbulent wake past real seabed elements for velocity variations characterization in the water column

机译：水柱速度变化速度变化的湍流唤醒的实验研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In high flow velocity areas like those suitable for marine energy application, bathymetry variations create strong velocity fluctuations in the water column. It is therefore essential to characterize the turbulence evolution in the wake of seabed elements which may impact the loads on tidal turbines. For that purpose, experiments are carried out in a flume tank with R-e as high as achievable in Froude similitude, with bathymetry variations experimentally represented with various wall-mounted square elements of height H: a cylinder or a cube as unitary obstacles and combinations of these elements followed by an inclined floor to resemble smooth bathymetry changes. The onset flow is a simple boundary layer profile with height 1.3 H and a low turbulence intensity. PIV and LDV measurements are used to investigate the wake past all test cases in order to distinguish high floor elevation cases (unitary obstacles) from mean roughness effect (obstacle combinations). Results show that the obstacle combinations produce a wake less extended than for a single wide cylinder that produces an extended wake and very energetic turbulent events. With a single cube, no downstream development of large turbulent events exist and the wake reduces by a factor of 3 compared to the wake cylinder case. An inclined floor downstream of a single wall-mounted obstacle reduces its wake length but does not alter the turbulent structures shed. Turbulent velocity profiles extracted from every wake topology investigated are also compared. The general conclusion is that: for small aspect ratio cases, the obstacle will not affect the water column. On the contrary, strong energetic turbulent events are emitted from large aspect ratio obstacles. Combinations cases stand in-between.
机译：在适用于海洋能源应用的高流速区域中，沐浴曲率变化在水柱中产生强烈的速度波动。因此，必须在海底元件唤醒中表征湍流演变，这可能会影响潮汐涡轮机上的负载。为此目的，实验在Flume罐中进行，其在Froude类似的可实现的高度，并且由各种壁挂式的高度H：圆筒或立方体作为整体障碍物的浴室变化，以及这些元素，其次是倾斜的楼层以类似于平滑的沐浴浴变化。起始流程是具有高度1.3小时的简单边界层轮廓和低湍流强度。 PIV和LDV测量用于调查所有测试用例的唤醒，以便区分高层仰角（酉障碍）从平均粗糙度效应（障碍物组合）。结果表明，障碍物组合产生的延伸速度，而不是产生延长唤醒和非常精力湍流事件的单个宽圆柱。通过单个立方体，不存在大动荡的事件的下游发展，并且与唤醒气缸壳相比，唤醒减少了3倍。在单壁安装障碍物下游的倾斜地板减小了其唤醒长度，但不会改变湍流结构流动。还比较了从每个尾尾拓扑中提取的湍流速度曲线。一般结论是：对于小宽高比案例，障碍不会影响水柱。相反，强大的能量湍流事件从宽高的宽高比障碍中发出。组合案例站在其中。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号