Bead formation and wire temperature distribution during ULTRA-HIGH-SPEED GTA WELDING using pulse-heated hot-wire

2011 ◽  
Vol 55 (3-4) ◽  
pp. 12-18 ◽  
Author(s):  
Kenji Shinozaki ◽  
Motomichi Yamamoto ◽  
Koichi Mitsuhata ◽  
Toshiharu Nagashima ◽  
Tatsunori Kanazawa ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
High Speed ◽  
Gta Welding ◽  
Hot Wire ◽  
Wire Temperature ◽  
Bead Formation ◽  
Ultra High Speed

scholarly journals Melting Phenomenon during Ultra-High-Speed GTA Welding Method using Pulse-heated Hot-wire

2009 ◽  
Vol 27 (2) ◽  
pp. 22s-26s ◽  
Author(s):  
K. Shinozaki ◽  
M. Yamamoto ◽  
Y. Nagamitsu ◽  
T. Uchida ◽  
K. Mitsuhata ◽  
...  
Keyword(s):  
High Speed ◽  
Gta Welding ◽  
Hot Wire ◽  
Welding Method ◽  
Melting Phenomenon ◽  
Ultra High Speed

Steady and Unsteady Temperature Measurements in the Wake of a Linear Cascade with Heated Airfoils

2021 ◽  
pp. 1-14
Author(s):  
Svenja Aberle-Kern ◽  
Thomas Ripplinger ◽  
Reinhard Niehuis
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
High Speed ◽  
Measurement Data ◽  
Current Mode ◽  
Constant Current ◽  
Energy Separation ◽  
Hot Wire ◽  
Compressor Cascade ◽  
Unsteady Temperature

Abstract Understanding basic aerodynamic and thermodynamic processes in engine components is critical to achieving higher efficiencies and lower fuel consumption in aircraft engines. To aid in this process, a linear compressor cascade was investigated in the high-speed cascade wind tunnel of the Institute of Jet Propulsion to quantify the influence of heat transfer on the temperature distribution in the wake and, finally, the profile loss. For this purpose, a patented five-hole probe with an integrated thermocouple was developed and applied for steady measurements. Additionally, a hot-wire measurement set-up was implemented to receive temperature fluctuations via the constant current mode as well as velocity fluctuations via the constant temperature mode. A novel method for a two-way temperature and velocity correction for the two types of hot-wire measurement is presented. Good agreement between the measurement data of the five-hole probe and averaged data from hot-wire anemometry was found. The temperature distribution indicates the occurrence of energy separation which in some cases is overlain with the effects of heat transfer. In addition, the analysis of unsteady fluctuations of temperature and velocity give more detailed information about the vortex shedding in the wake, including the size of the vortices. Finally, this is the first discussion of energy separation at a compressor cascade combined with overlain effects of heat transfer on the blade surface.

Steady and Unsteady Temperature Measurements in the Wake of a Linear Cascade With Heated Airfoils

2020 ◽  
Author(s):  
Svenja Aberle-Kern ◽  
Thomas Ripplinger ◽  
Reinhard Niehuis
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
High Speed ◽  
Measurement Data ◽  
Current Mode ◽  
Constant Current ◽  
Energy Separation ◽  
Hot Wire ◽  
Compressor Cascade ◽  
Unsteady Temperature

Abstract Understanding basic aerodynamic and thermodynamic processes in engine components is critical to achieving higher efficiencies and lower fuel consumption in aircraft engines. To aid in this process, a linear compressor cascade was investigated in the high-speed cascade wind tunnel of the Institute of Jet Propulsion to quantify the influence of heat transfer on the temperature distribution in the wake and, finally, the profile loss. For this purpose, a patented five-hole probe with an integrated thermocouple was developed and applied for steady measurements. Additionally, a hot-wire measurement set-up was implemented to receive temperature fluctuations via the constant current mode as well as velocity fluctuations via the constant temperature mode. A novel method for a two-way temperature and velocity correction for the two types of hot-wire measurement is presented. Good agreement between the measurement data of the five-hole probe and averaged data from hot-wire anemometry was found. The temperature distribution indicates the occurrence of energy separation which in some cases is overlain with the effects of heat transfer. In addition, the analysis of unsteady fluctuations of temperature and velocity give more detailed information about the vortex shedding in the wake, including the size of the vortices. Finally, this is the first discussion of energy separation at a compressor cascade combined with overlain effects of heat transfer on the blade surface.

Recent Advances in Ultra-High-Speed Waveguide Photodiodes for Optical Communication Systems

2009 ◽  
Vol E92-C (7) ◽  
pp. 922-928 ◽  
Author(s):  
Kikuo MAKITA ◽  
Kazuhiro SHIBA ◽  
Takeshi NAKATA ◽  
Emiko MIZUKI ◽  
Sawaki WATANABE
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
High Speed ◽  
Recent Advances ◽  
Ultra High Speed ◽  
Optical Communication Systems
Sign in / Sign up

Export Citation Format

Share Document