Study on Unstable Structure of Three-dimensional Vortices and its Oscillation induced by Cavitation Interaction

三维涡旋不稳定结构及其空化作用引起的振荡研究

基本信息

  • 批准号:
    17360081
  • 负责人:
  • 金额:
    $ 9.92万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2005
  • 资助国家:
    日本
  • 起止时间:
    2005 至 2007
  • 项目状态:
    已结题

项目摘要

Cavitation instabilities such as rotating cavitation and cavitation surge are one of the most important problems to be solved for realization of small-sized high-speed turbopumps. It is important to understand complex vortex structures in the internal flow and the unsteady cavity behavior, both of which play dominant roles in the cavitation instabilities. In the present study, we focused on the cavitation surge in helical inducers, in which the complex vortical flow structures including strong inlet back flow appear.It is known that the cavitation surge is strongly associated with the inlet back flow and the installation of the obstacle plate upstream of inducer is effective for the suppression of the cavitation surge. In the present study, in FY2005, we measured the inlet flow of inducers with the different blade tip angle, and we investigated the effect of the inlet ring plate, which blocks the back flow near the tip region, on the inlet back flow as well as on the onset region of the cavitation surge. As a result, it was found that the angular momentum in the back flow is increased by installing the inlet plate, resulting in the increase of the static pressure near the tip region and the suppression of the cavitation surge. In FY2006, we carried out the numerical flow analysis of the inducer, which supported the previous experimental results. Next, we measured the inlet flow distortion due to the inlet baffle plate which blocks the back flow partially in the circumferential direction. And also we developed the multi-cameras observation system which enables us to observe the simultaneous cavity pattern from blade to blade. In FY2007, we clarified the suppression mechanism of the cavitaion surge by installing the above two kinds of obstacle plate through the flow measurement, the cavity observation and the numerical simulation.
旋转空化、空化喘振等空化不稳定性是实现小型高速涡轮泵需要解决的重要问题之一。了解内部流动中复杂的旋涡结构和非定常空泡行为是非常重要的,这两者在空化不稳定性中都起着主导作用。本文主要研究了螺旋桨叶轮内的空化喘振现象,发现螺旋桨叶轮内存在着包括强回流在内的复杂的涡流结构,空化喘振与进口回流有很强的相关性,在诱导器上游设置障碍板是抑制空化喘振的有效措施。在本研究中,我们在2005财年测量了不同叶尖角的引进器的进口流量,并研究了进口环板对进口回流的影响,以及对空化喘振起始区的影响。结果表明,加装进气板后,回流角动量增大,导致叶尖附近静压增大,空化浪涌得到抑制。在2006财年,我们进行了诱导器的数值流动分析,支持了前面的实验结果。接下来,我们测量了由于进气挡板在圆周方向上阻挡了部分回流而引起的进气变形。并开发了多摄像机观测系统,可以同时观测叶片间的空泡图案。2007财年,我们通过流量测量、空泡观测和数值模拟,通过安装上述两种障碍板,阐明了空泡涌浪的抑制机理。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Tentative Study on Real-time Data Processing for Advance Detection of Cavitation Surge in Pump Inducer
水泵诱导轮空蚀喘振超前检测实时数据处理初探
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
    J.-H.;Kim;J. -H. Kim;T. Atono
  • 通讯作者:
    T. Atono
Suppression of Cavitation Surge of Pump Inducer by Inserting Ring-shaped Inlet Plate.
插入环形进口板抑制泵导轮空蚀喘振。
  • DOI:
  • 发表时间:
    2006
  • 期刊:
  • 影响因子:
    0
  • 作者:
    J.-H.;Kim
  • 通讯作者:
    Kim
Suppression of Cavitation Surge of Inducer by Inserting Axi-asymmetric Obstacle Plate
插入轴不对称障碍板抑制诱导器空化浪涌
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
    J.-H.;Kim
  • 通讯作者:
    Kim
ポンプインデューサの人工上流に付設した軸対称障害版の脈動キャビテーション抑制効果
泵诱导轮人工上游轴对称失效板的脉动空化抑制效果
Rotating Behavior Observation of Cavitation in Inducer with Suction Axi-asymmetrical Plate
吸力轴非对称板诱导轮空化旋转行为观察
  • DOI:
  • 发表时间:
    2007
  • 期刊:
  • 影响因子:
    0
  • 作者:
    J.-H.Kim;et. al.
  • 通讯作者:
    et. al.
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FURUKAWA Akinori其他文献

FURUKAWA Akinori的其他文献

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{{ truncateString('FURUKAWA Akinori', 18)}}的其他基金

Development of Handy-type Hydraulic Turbine for Shallow Flow in U-type Gutter
U型天沟浅流轻便型水轮机的研制
  • 批准号:
    16K12654
  • 财政年份:
    2016
  • 资助金额:
    $ 9.92万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Basic Study on High Efficiency Operation and Surge Control of Axial Flow Pump with Contra-Rotating Rotors
对转转子轴流泵高效运行及喘振控制基础研究
  • 批准号:
    12450077
  • 财政年份:
    2000
  • 资助金额:
    $ 9.92万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Synthetic Study on Unstable Flow Phenomena in Turbomachineries under Extreme Operating Conditions and the Flow Control and Advance Detection
极端工况下透平机械不稳定流动现象及流量控制与提前检测综合研究
  • 批准号:
    10555061
  • 财政年份:
    1998
  • 资助金额:
    $ 9.92万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
A Development of Operating System with Darrieus-type Cross-flow Water Turbine for Ultra-low Head Hydro-power
超低水头水轮机Darrieus型贯流水轮机操作系统的开发
  • 批准号:
    02555040
  • 财政年份:
    1990
  • 资助金额:
    $ 9.92万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)

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