首页> 外文OA文献 >Relieving loading on tidal turbines operating in a turbulent environment: proposal for load alleviation device for a marine turbine
【2h】

Relieving loading on tidal turbines operating in a turbulent environment: proposal for load alleviation device for a marine turbine

机译:减轻在湍流环境下运行的潮汐涡轮机的负荷:船用涡轮机负荷减轻装置的建议

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Tidal turbines operate in marine currents characterised by strong turbulence. This environmentimpacts on the life of the device, blades, transmission and running train ancillaries,bearings and seals, for example. The reduction of the transient load on the turbine blade canbe achieved through a range of measures; in this investigation, modifications to the bladecomprising blowing actuators will be modelled using the FLUENT CFD RANS solver withthe k-ω SST turbulence model.Different locations on the suction side for the blowing are explored. Different anglesand pressures of the blowing are explored for steady state cases. The final chosen locationfor the ejection was near the trailing edge (TE) for unsteady simulations with sinusoidal jetexcitation and an oscillating-flow inlet boundary condition.The most obvious effectiveness is at low actuation frequency and mid-to-high jet-strength.This results in reduction of lift at the higher angles of attack, α, and reduction of∆L∆α. Theaction of the unsteady ejection re-shapes the hysteresis lift curve with little change in dragand reduces drag in some cases. A counter-rotating pair of vortices is formed due to the TEejection, which altered the direction of flow leaving the TE due to a small region of inducedrecirculating flow behind the TE. One of the vortices takes the form of a curtailed TE vortex.It is thought that this could, under the right conditions, be caused to merge with the wake andshed to result in a more docile stall.The CFD validation study performed first of all, consisted of a comparison betweenthe two relative types of motion - a pitching aerofoil and static aerofoil subjected to flowoscillation. This study uncovered substantial differences in the dynamic stall mechanicsbetween wind tunnel experiments on a pitching aerofoil and the kind experienced by a turbineblade due to oscillating loads in highly unsteady flow. Many wind turbine data currentlydepends on the relative motion between aerofoil and flow.
机译:潮汐涡轮机在湍流强烈的海流中运行。例如,这种环境会影响设备,刀片,传动和行驶的火车附件,轴承和密封件的寿命。可以通过一系列措施来减少涡轮叶片上的瞬态负载。在这项研究中,将使用FLUENT CFD RANS求解器与k-ωSST湍流模型对包含叶片的吹风执行器进行建模,并探索在吹风的吸力侧的不同位置。对于稳态情况,探索了不同角度和吹气压力。对于正弦喷射激流和振荡流入口边界条件的不稳定模拟,最终选择的喷射位置在后缘(TE)附近,最明显的效果是在低致动频率和中高喷射强度下。较大的迎角α时,升力降低,ΔLΔα降低。不稳定喷射的作用在阻力变化不大的情况下重塑了磁滞升力曲线,并在某些情况下减小了阻力。由于TE的喷射,形成了一对反向旋转的涡流,由于TE后面的一小部分诱导循环流,改变了离开TE的流动方向。其中一个涡流采取减少的TE涡流的形式,据认为可以在适当的条件下将其与尾流融为一体,从而产生更温顺的失速.CFD验证研究首先进行,包括两种相对运动类型的比较-桨叶翼型和静翼翼型受到流振荡的影响。这项研究揭示了桨叶翼型风洞实验与涡轮叶片由于高度不稳定流动中的振荡载荷而经历的那种之间的动态失速力学之间的实质性差异。当前,许多风力涡轮机数据取决于翼型和流之间的相对运动。

著录项

  • 作者

    Garden Sarah Rosaline;

  • 作者单位
  • 年度 2016
  • 总页数
  • 原文格式 PDF
  • 正文语种
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利

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