On the Development and Verification of a Three-Phase Soil Model for Tunnelling under Compressed Air

2009 ◽  
Author(s):  
G. Oettl ◽  
R.F. Stark ◽  
G. Hofstetter
Keyword(s):  
Compressed Air ◽  
Soil Model ◽  
Three Phase

scholarly journals ASYNCHRONOUS THREE-PHASE MACHINE DRIVEN AS GENERATOR BY A TWIN-SCREW EXPANDER

2021 ◽  
Vol 2020 (1) ◽  
pp. 1-8
Author(s):  
Claudia BORZEA ◽  
Adrian SAVESCU ◽  
Iulian VLADUCA ◽  
Adrian STOICESCU
Keyword(s):  
Energy Storage ◽  
Compressed Air ◽  
Storage Facility ◽  
Generator System ◽  
Control Cabinet ◽  
Three Phase ◽  
Twin Screw ◽  
Absorbed Power ◽  
Automation Control ◽  
Power Curves

The paper presents the functioning regimes of a 132 kW asynchronous three-phase machine, used for the expander-generator system in a compressed air energy storage facility. The installation consists of a 110 kW twin-screw electro-compressor, which supplies pressurized air up to ~16 bar into a 50 cubic meters storage vessel. The compressed air is afterwards released from the reservoir into expander’s inlet, spinning its shaft. When the expander’s shaft spins the electric machine over its synchronous speed, this one enters in generator mode, supplying electric power into the grid. Two power analysers installed on the automation control cabinet monitor the generated/absorbed power and the power supplied/consumed by the system from the grid. Using the data acquired by means of PLC during commissioning tests, we plotted the power curves, differential pressure and significant temperatures, as well as the electric machine’s speed.

Powder Mixed near Dry Electrical Discharge Machining

2012 ◽  
Vol 500 ◽  
pp. 253-258 ◽  
Author(s):  
Xue Bai ◽  
Qin He Zhang ◽  
Tian Tian Li ◽  
Jian Hua Zhang
Keyword(s):  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Discharge Voltage ◽  
Dielectric Medium ◽  
Compressed Air ◽  
Comparative Experiment ◽  
Three Phase ◽  
Dry Electrical Discharge Machining

Powder mixed near dry electrical discharge machining (PMND-EDM), which uses gas-liquid-powder mixture as three phase dielectric medium to remove materials, is proposed. Compared with dry EDM, much higher material removal rate (MRR) is achieved in PMND-EDM. The mechanism of PMND-EDM is analyzed and reasons for its MRR improvement are illustrated. Comparative experiment is done in compressed air and three phase dielectric medium, respectively. MRR is calculated. And discharge voltage waveforms are obtained by oscilloscope. It is shown that three phase dielectric medium can improve MRR effectively.

Test of the stability of a three-phase contact line with negative line tension

1999 ◽  
Vol 96 (9) ◽  
pp. 1335-1339 ◽  
Author(s):  
ALAN E. VAN GIESSEN, DIRK JAN BUKMAN, B.
Keyword(s):  
Contact Line ◽  
Line Tension ◽  
Phase Contact ◽  
Three Phase ◽  
The Stability
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