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Axial-Swept Influence on Inner Flow Performance of HP Steam Turbine Based on CFD

机译：基于CFD的HP汽轮机内流性​​能的轴向扫描影响

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Swept blade technology was used to redesign the supercritical steam turbine sets that could improve the inner-efficiency of turbine sets and decrease the consumption of coal the noxious gas such as NOx. The eighth high-pressure stages, including static and rotor cascades, were selected as tested prototypes that were blew in the low-velocity wind tunnel. We used the five-hole ball head needle to measure the aerodynamic parameters distribution along the width and span direction of the high-pressure stage cascades. With the inkblot display technology, the limit flow spectrums were displaced in the blade surface and the endwalls. These tested data could be used to check the simulation results of CFD software. To improve the efficiency of the steam turbine high-pressure (HP) stage, we selected the supercritical steam turbine HP stage cascade blade as the prototype to research into its inner flow performance of the axial-swept blade by the CFD software. Two different redesigned blades, with +/- 20 degrees, swept angle, and 30% swept height, named axial fore-swept and axial aft-swept, were built up. The stage passages flow field of the prototype blade, and the two redesigned swept blades were simulated using CFD software with stage interface planes between the stages. The CFD simulation results indicated that the leading edge of swept blades influenced the inlet flow field; the pressure in aft-swept blade stage in both endwalls was higher than in the middle and was beneficial to improve the passage flow properties of HP stage. But for the fore-swept HP stage, its pressure distribution was lower in both endwalls than in the middle and not beneficial to passage flow.
机译：扫地刀片技术用于重新设计超临界汽轮机组，可以提高涡轮机组的内效，降低煤的煤炭消耗，例如NOx。包括静态和转子级联包括静态和转子级联的第八个高压阶段作为在低速风隧道中吹过的测试原型。我们使用了五孔球头针来测量沿高压级级联的宽度和跨度方向的空气动力学参数分布。利用墨迹显示技术，极限流程谱在叶片表面和端壁中移位。这些测试数据可用于检查CFD软件的仿真结果。为了提高汽轮机高压（HP）阶段的效率，我们选择了超临界汽轮机HP级级联刀片作为研究CFD软件的轴向扫描刀片内部流动性能的原型。建立了两个不同的重新设计刀片，+/-20度，扫过角度和30％的扫掠高度，被建立在轴上前扫和轴向斩波。使用CFD软件模拟了原型刀片的舞台通道流场和两个重新设计的扫刀片，其中级在阶段之间具有舞台界面平面。 CFD仿真结果表明，扫刀片的前缘影响了入口流场;两端横扫叶片阶段的压力高于中间的级，有利于改善HP阶段的通道流动性质。但对于前扫HP阶段，其在端壁中的压力分布比中间的压力分布较低，而不是有益于通过流动。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第16期|5363496.1-5363496.13|共13页
  • 作者

    Feng Zi-Ming; Guo Chenhao; Wei Bingkun; Cui Wei; Gu Huibin; Zhang Jindong;

  • 作者单位

    Northeast Petr Univ Sch Mech Sci & Engn Daqing Peoples R China;

    Northeast Petr Univ Sch Mech Sci & Engn Daqing Peoples R China;

    Daqing Oilfield Powerlift Pump Ind Co Ltd Daqing Peoples R China;

    Northeast Petr Univ Sch Mech Sci & Engn Daqing Peoples R China;

    Northeast Petr Univ Sch Mech Sci & Engn Daqing Peoples R China;

    Northeast Petr Univ Sch Mech Sci & Engn Daqing Peoples R China;

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