Journal of Engineering for Gas Turbines and Power
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Lean-Burn Stationary Natural Gas Engine Operation With a Prototype Laser Spark Plug
Journal of Engineering for Gas Turbines and Power - Tập 132 Số 7 - 2010
An end pumped passively Q-switched laser igniter was developed to meet the
ignition system needs of large bore lean burn stationary natural gas engines.
The laser spark plug used an optical fiber coupled diode pump source to axially
pump a passively Q-switched Nd:YAG laser and transmit the laser pulse through a
custom designed lens. The optical fiber coupled pump source permits the
excitation ener...
Laser Ignition of Methane-Air Mixtures at High Pressures and Diagnostics
Journal of Engineering for Gas Turbines and Power - Tập 127 Số 1 - Trang 213-219 - 2005
Methane-air mixtures at high fill pressures up to 30 bar and high temperatures
up to 200°C were ignited in a high-pressure chamber with automated fill control
by a 5 ns pulsed Nd:YAG laser at 1064 nm wavelength. Both, the minimum input
laser pulse energy for ignition and the transmitted fraction of energy through
the generated plasma were measured as a function of the air/fuel-equivalence
ratio (λ...
Synthesized Synchronous Sampling Technique for Differential Bearing Damage Detection
Journal of Engineering for Gas Turbines and Power - Tập 132 Số 7 - 2010
The differential bearing between the low-pressure turbine (LPT) and
high-pressure turbine (HPT) shafts is one of the most vulnerable parts in a
turbomachinery engine. Unfortunately, it is also one of the most difficult parts
to monitor for damage existence signatures, because the signal-to-noise ratio at
the normal sensor locations is extremely low. In addition, the speed variations
in both the LP...
Experimental Analysis of Confined Jet Flames by Laser Measurement Techniques
Journal of Engineering for Gas Turbines and Power - Tập 134 Số 4 - 2012
An experimental analysis of confined premixed turbulent methane/air and
hydrogen/air jet flames is presented. A generic lab scale burner for
high-velocity preheated jets equipped with an optical combustion chamber was
designed and set up. The size and operating conditions were configured to enable
flame stabilization by recirculation of hot combustion products. The geometry of
the rectangular conf...
Description of a Semi-Independent Time Discretization Methodology for a One-Dimensional Gas Dynamics Model
Journal of Engineering for Gas Turbines and Power - Tập 131 Số 3 - 2009
Modeling has become an essential technique in design and optimization processes
of internal combustion engines. As a consequence, the development of accurate
modeling tools is, in this moment, an important research topic. In this paper, a
gas-dynamics modeling tool is presented. The model is able to reproduce the
global behavior of complete engines. This paper emphasizes an innovative
feature: the...
Ceramic Matrix Composite Materials for Engine Exhaust Systems on Next-Generation Vertical Lift Vehicles
Journal of Engineering for Gas Turbines and Power - Tập 140 Số 10 - 2018
Future gas turbine engines will operate at significantly higher temperatures
(∼1800 °C) than current engines (∼1400 °C) for improved efficiency and power
density. As a result, the current set of metallic components (titanium-based and
nickel-based superalloys) will be replaced with ceramics and ceramic matrix
composites (CMCs). These materials can survive the higher operating temperatures
of futur...
Development and Turbine Engine Performance of Three Advanced Rhenium Containing Superalloys for Single Crystal and Directionally Solidified Blades and Vanes
Journal of Engineering for Gas Turbines and Power - Tập 120 Số 3 - Trang 595-608 - 1998
Turbine inlet temperatures over the next few years will approach 1650°C (3000°F)
at maximum power for the latest large commercial turbofan engines, resulting in
high fuel efficiency and thrust levels approaching 445 KN (100,000 lbs.). High
reliability and durability must be intrinsically designed into these turbine
engines to meet operating economic targets and ETOPS certification requirements.
Th...
Crack Initiation in a Coated and an Uncoated Nickel-Base Superalloy Under TMF Conditions
Journal of Engineering for Gas Turbines and Power - Tập 120 Số 4 - Trang 792-795 - 1998
A thermomechanical fatigue (TMF) cycle, intended to represent aeroengine blade
working conditions, was selected for carrying out tests on uncoated and
aluminide coated SRR99 samples until test piece failure. Optical images of the
surface of test pieces were collected during testing to monitor surface crack
initiation and accompanying transformations. Using these images, surface changes
were quanti...
A Study of Combustion Characteristics of Gasified Coal Fuel
Journal of Engineering for Gas Turbines and Power - Tập 123 Số 1 - Trang 22-32 - 2001
The development of integrated, coal-gasification combined cycle (IGCC) systems
provides cost-effective and environmentally sound options for meeting future
coal-utilizing power generation needs in the world. The Japanese government and
the Electric Power Industries in Japan promoted research and development of an
IGCC system. We have being working on developing a low-NOx combustion technology
used...
High Pressure Test Results of a Catalytically Assisted Ceramic Combustor for a Gas Turbine
Journal of Engineering for Gas Turbines and Power - Tập 121 Số 3 - Trang 422-428 - 1999
A catalytically assisted ceramic combustor for a gas turbine was designed to
achieve low NOx emission under 5 ppm at a combustor outlet temperature over
1300°C. This combustor is composed of a burner system and a ceramic liner behind
the burner system. The burner system consists of 6 catalytic combustor segments
and 6 premixing nozzles, which are arranged in parallel and alternately. The
ceramic l...
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