Experimental Investigations on Slurry Erosion Behaviour of HVOF and HVOLF Sprayed Coatings on Hydraulic Turbine Steel

2016 ◽  
Vol 70 (6) ◽  
pp. 1585-1592 ◽  
Author(s):  
Harjinder Singh ◽  
Khushdeep Goyal ◽  
Deepak Kumar Goyal
Keyword(s):  
Hydraulic Turbine ◽  
Experimental Investigations ◽  
Slurry Erosion ◽  
Erosion Behaviour ◽  
Turbine Steel ◽  
Sprayed Coatings

Slurry erosion behaviour of HVOF sprayed WC–10Co–4Cr and Al2O3+13TiO2 coatings on a turbine steel

Wear ◽  
2012 ◽  
Vol 289 ◽  
pp. 46-57 ◽  
Author(s):  
Deepak Kumar Goyal ◽  
Harpreet Singh ◽  
Harmesh Kumar ◽  
Varinder Sahni
Keyword(s):  
Slurry Erosion ◽  
Erosion Behaviour ◽  
Turbine Steel

An overview of slurry erosion control by the application of high velocity oxy fuel sprayed coatings

2011 ◽  
Vol 225 (11) ◽  
pp. 1092-1105 ◽  
Author(s):  
D K Goyal ◽  
H Singh ◽  
H Kumar
Keyword(s):  
Thermal Spray ◽  
High Velocity ◽  
Power Plants ◽  
Thermal Spray Technology ◽  
Research Work ◽  
Hydraulic Turbine ◽  
Economic Losses ◽  
Slurry Erosion ◽  
Spray Process ◽  
Sprayed Coatings

Slurry erosion of turbine components is a serious problem in most of the hydraulic power plants all around the world. Although some counter measures such as catchment area treatment to reduce the amount of sand particles going through the turbine components and modifying the hydraulic shape of turbine to reduce slurry erosion have been taken, still slurry erosion is responsible for heavy economic losses. Research is also in progress for improving the surface properties of the turbine components by the application of thermal sprayed coatings. Among various thermal spray processes, high-velocity oxy fuel (HVOF) spray process is a relatively industrially established and economical process. In this paper, an attempt has been made to describe HVOF thermal spray technology. Further, this paper presents a tutorial introduction, comprehensive history, and review of research work done on the use of this technique to provide protection against slurry erosion of some metals and alloys with a special emphasis on the hydraulic turbine steels.

Slurry erosion behaviour and mechanism of HVOF sprayed micro-nano structured WC-CoCr coatings in NaCl medium

2020 ◽  
Vol 148 ◽  
pp. 106315 ◽  
Author(s):  
Yan Huang ◽  
Xiang Ding ◽  
Cheng-Qing Yuan ◽  
Zhong-Kun Yu ◽  
Zhang-Xiong Ding
Keyword(s):  
Slurry Erosion ◽  
Erosion Behaviour

Investigations Of Pressure Pulsations In A Model Of Draft Tube Of Hydraulic Turbine Caused By Vortex Rings

2016 ◽  
Vol 11 (4) ◽  
pp. 25-32
Author(s):  
Sergey Skripkin ◽  
Mikhail Tsoy ◽  
Sergey Shtork ◽  
Pavel Kuibin
Keyword(s):  
Vortex Ring ◽  
High Speed ◽  
Draft Tube ◽  
Hydraulic Turbine ◽  
Vortex Rings ◽  
Experimental Investigations ◽  
Visualization Technique ◽  
Vortex Rope ◽  
Hydro Turbine ◽  
Hydraulic Turbines

Current work is devoted to experimental investigations of behavior of precessing vortex rope in a draft tube model of hydraulic turbine. We used combination of stationary and freely rotating swirlers as a hydro turbine model. Such construction provides velocity distribution on the draft tube inlet close to distribution in natural hydraulic turbines operated at non-optimal conditions. The phenomenon of precessing vortex rope reconnection with further formation of vortex ring was founded in this experimental research using high-speed visualization technique. Synchronization of highspeed visualization and pressure measurements allowed us to relate pressure shock on the draft tube wall with vortex ring moving along wall.

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