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首页> 外文期刊>Thermal engineering >An Experimental Investigation into Nozzle Vane Heating to Prevent Erosion in the Last Stages of Steam Turbines
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An Experimental Investigation into Nozzle Vane Heating to Prevent Erosion in the Last Stages of Steam Turbines

机译：喷嘴叶片加热的实验研究，防止汽轮机最后阶段腐蚀

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Abstract The paper is devoted to an experimental investigation of nozzle vane heating in the last stage of a wet steam turbine. The investigation was performed at a steam-dynamic test facility whose circuit was connected to an operating cogeneration power station (TETs). The working fluid was steam from a heat extraction assembly of a steam turbine. To prepare a polydisperse wet steam flow specific for the last stages of steam turbines, a three-stage wetting system based on feedwater injection into the flow was used. The object of investigation is a flat vane cascade consisting of hollow vanes. The vane cavities are fed with superheated steam to provide heating. Experimental data are presented demonstrating that it is advisable to heat nozzle vanes: first, the economic characteristics are improved, and, second, erosion of the blades in the last stages decreases. This method can be used as an alternative to the internal moisture separation from the steam path. The experimental investigation yielded the effect of the temperature difference between the main flow and the heating steam on the amount of heat transferred to the main flow and on the steam conditions at the outlet from the heating chamber. It was found that condensation in the heating chamber decreased its outlet pressure. This should be considered in designing a similar active system to control erosion of rotor blades. The measured profile losses of kinetic energy downstream of the vane cascade for different temperature difference values are presented. The kinematic characteristics of the liquid phase downstream of the vane trailing edge are determined. Large temperature differences are found to have a negative effect on droplets and can reduce the erosion resistance of the blades as compared with profiles without any active erosion control methods.
机译：摘要本文致力于在湿汽轮机的最后阶段进行喷嘴叶片加热的实验研究。该研究在蒸汽动力学测试设备进行，其电路连接到操作热电电站（Tets）。从蒸汽涡轮机的热萃取组件中工作流体是蒸汽。为了制备针对蒸汽轮机的最后一级的多分散湿蒸汽流动，使用基于进给流入流入的三级润湿系统。调查对象是由空心叶片组成的扁平叶片级联。叶片空腔用过热的蒸汽供给以提供加热。提出了实验数据，表明热喷嘴叶片是可取的：首先，经济特点得到改善，第二个阶段中叶片的侵蚀降低。该方法可以用作与蒸汽路径的内部水分分离的替代方案。实验研究产生了主流和加热蒸汽之间的温差与加热室中的热量的温差和加热蒸汽之间的效果。发现加热室中的冷凝降低了其出口压力。这应该考虑在设计类似的主动系统来控制转子叶片的侵蚀。呈现了在叶片级联下游的测量轮廓损耗，用于不同的温差值。确定叶片后缘下游的液相的运动学特性。发现大的温度差异对液滴产生负面影响，与没有任何主动腐蚀控制方法的曲线相比，可以降低叶片的腐蚀性阻力。

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