High brightness extreme ultraviolet (at 13.5 nm) emission from time-of-flight controlled discharges with coaxial fuel injection

2008 ◽  
Vol 104 (5) ◽  
pp. 053305 ◽  
Author(s):  
Tomonao Hosokai ◽  
Takuma Yokoyama ◽  
Alexei Zhidkov ◽  
Hiroto Sato ◽  
Kazuhiko Horioka ◽  
...  
Keyword(s):  
Fuel Injection ◽  
Extreme Ultraviolet ◽  
Time Of Flight ◽  
High Brightness

scholarly journals Elongation of extreme ultraviolet (at 13.5 nm) emission with time-of-flight controlled discharges and lateral fuel injection

2008 ◽  
Vol 104 (5) ◽  
pp. 053306 ◽  
Author(s):  
Tomonao Hosokai ◽  
Takuma Yokoyama ◽  
Alexei Zhidkov ◽  
Hiroto Sato ◽  
Eiki Hotta ◽  
...  
Keyword(s):  
Fuel Injection ◽  
Extreme Ultraviolet ◽  
Time Of Flight

An Acoustic Time-of-Flight Approach for Unsteady Temperature Measurements: Characterization of Entropy Waves in a Model Gas Turbine Combustor

2016 ◽  
Vol 139 (4) ◽  
Author(s):  
Dominik Wassmer ◽  
Bruno Schuermans ◽  
Christian Oliver Paschereit ◽  
Jonas P. Moeck
Keyword(s):  
Gas Turbine ◽  
Acoustic Waves ◽  
Fuel Injection ◽  
Acoustic Pulse ◽  
Time Of Flight ◽  
Phase Lag ◽  
Mean Flow ◽  
Unsteady Temperature ◽  
Arrival Times ◽  
Flow Velocities

Lean premixed combustion promotes the occurrence of thermoacoustic phenomena in gas turbine combustors. One mechanism that contributes to the flame–acoustic interaction is entropy noise. Fluctuations of the equivalence ratio in the mixing section cause the generation of hot spots in the flame. These so-called entropy waves are convectively transported to the first stage of the turbine and generate acoustic waves that travel back to the flame; a thermoacoustic loop is closed. However, due to the lack of experimental tools, a detailed investigation of entropy waves in gas turbine combustion systems has not been possible up to now. This work presents an acoustic time-of-flight based temperature measurement method which allows the measurement of temperature fluctuations in the relevant frequency range. A narrow acoustic pulse is generated with an electric spark discharge close to the combustor wall. The acoustic response is measured at the same axial location with an array of microphones circumferentially distributed around the combustion chamber. The delay in the pulse arrival times corresponds to the line-integrated inverse speed of sound. For the measurement of entropy waves in an atmospheric combustion test rig, fuel is periodically injected into the mixing tube of a premixed combustor. The subsequently generated entropy waves are measured for different forcing frequencies of the fuel injection and for different mean flow velocities in the combustor. The amplitude decay and phase lag of the entropy waves adhere well to a Strouhal number scaling for different mean flow velocities.

Numerical evaluation of a 13.5-nm high-brightness microplasma extreme ultraviolet source

2015 ◽  
Vol 118 (19) ◽  
pp. 193301 ◽  
Author(s):  
Hiroyuki Hara ◽  
Goki Arai ◽  
Thanh-Hung Dinh ◽  
Weihua Jiang ◽  
Taisuke Miura ◽  
...  
Keyword(s):  
Numerical Evaluation ◽  
Extreme Ultraviolet ◽  
High Brightness

Evaluation of a dot target based high-brightness microplasma extreme ultraviolet (EUV) source by hydrodynamic simulation

2015 ◽  
Author(s):  
Hiroyuki Hara ◽  
Goki Arai ◽  
Thanh-Hung Dinh ◽  
Atsushi Sunahara ◽  
Takeshi Higashiguchi
Keyword(s):  
Extreme Ultraviolet ◽  
Hydrodynamic Simulation ◽  
High Brightness

Stable droplet generator for a high brightness laser produced plasma extreme ultraviolet source

2016 ◽  
Vol 87 (10) ◽  
pp. 103304 ◽  
Author(s):  
A. Vinokhodov ◽  
M. Krivokorytov ◽  
Yu. Sidelnikov ◽  
V. Krivtsun ◽  
V. Medvedev ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Droplet Generator ◽  
High Brightness ◽  
Laser Produced Plasma

Evolution of laser-produced Sn extreme ultraviolet source diameter for high-brightness source

2014 ◽  
Vol 105 (7) ◽  
pp. 074103 ◽  
Author(s):  
Amitava Roy ◽  
Goki Arai ◽  
Hiroyuki Hara ◽  
Takeshi Higashiguchi ◽  
Hayato Ohashi ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
High Brightness
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