Abstract
An experimental system to assess the water erosion resistance of the steam turbine blade material was built. It can conduct the test of the blade material water erosion resistance characteristic with different water jet diameter and different impact velocity. The experimental investigation of the water erosion resistance characteristics of the blade materials with different surface treatment processes are carried out. By weighing the specimens of each stage, the curves of mass loss with time are obtained. The 2D metal micrograph, 3D surface topography and cross section pit curves are achieved with a laser 3D microscopy. The results reveal the characteristics of the specimens at all stages during the experiment. A method was proposed that the water erosion resistance characteristic can be evaluated by the volume loss based on the pit cross section size, which solves the problem that it's difficult to compare the masses with different material densities or coating densities. The experimental study in this paper has great value for the turbine blade material selection in the steam stages and surface protection technology.
Highlights
An experimental system to assess the water erosion resistance of the steam turbine blade material was built. It can conduct the test of the blade material water erosion resistance characteristic with different water jet diameter and different impact velocity
A method was proposed that the water erosion resistance characteristic can be evaluated by the volume loss based on the pit cross section size, which solves the problem that it’s difficult to compare the masses with different material densities or coating densities
The last-stage blades of modern high-power ultrasupercritical and nuclear turbine are longer than before, which leads to a great increase in the circumferential velocity of the blade shroud
Summary
The last-stage blades of modern high-power ultrasupercritical and nuclear turbine are longer than before, which leads to a great increase in the circumferential velocity of the blade shroud. Water erosion resistance test on real turbine blade is expensive, so the key parameters are selected to simplify the experimental system in order to complete the analysis system. The serious influence caused by the high-velocity drop impact was proposed by Honegger [1], and later an experiment was carried out on account of the turbine blade water erosion accidents. The turbine blade material was impacted by the water jet with a velocity of 200m/s. Toshiyuki [9] et al developed a device to study the impact of high-speed steam-droplet spray on solid surface. These experimental systems show that water erosion depends on various experimental conditions and material characteristic parameters.
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