- 标题
- 摘要
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- 实验方案
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Restoration of Steam Turbine Last Stage Rotor Blades by Laser Surfacing
摘要： Technology is provided for restoring erosion damaged rotor blades of the last stages of steam turbine low-pressure cylinders (LPC) using laser-powder surfacing and application of an erosion-resistant coating. For this method there is typically low heat input into the blade basic metal, which improves its restoration reliability. Results are obtained for comprehensive experimental studies on specimens and blades, confirming the high quality of welded joints obtained by laser surfacing of nickel alloy proposed for restoring the blade profile of blade steels éI961-Sh and 15Kh11MF-Sh, and application of a stellite-6 erosion-resistant coating. The possibility is concluded of using the laser-powder surfacing method during refurbishment of steam turbine LPC rotor blades.
关键词： blade restoration,erosion damage,rotor blades,steam turbine,laser-powder surfacing
更新于2025-09-16 10:30:52
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Infrared Thermography and DIT of Quadcopter Rotor Blades Using Laser Heating
摘要： A measuring method to detect wall flow topologies by active infrared thermography was developed. Quadcopter rotor blades were studied in typical hover and forward flight conditions, while using a high-power infrared laser to heat the blade surface. By this, the distance between heat source and measuring object could be significantly increased compared to conventional heat sources. The resulting images show little blurring at high signal-to-noise ratios. In steady-state flow conditions, wall flow topologies could be detected reliably and show good agreement with performed oil-film interferometry measurements. Wind tunnel experiments at forward flight conditions were conducted and indicate unsteady shifts of the transition location.
关键词： laser heating,rotor blades,differential infrared thermography,boundary-layer transition,thermography,oil-film interferometry
更新于2025-09-11 14:15:04