Laser Ignition: A New Concept to Use and Increase the Potentials of Gas Engines

2005 ◽  
Author(s):  
Gu¨nther Herdin ◽  
Johann Klausner ◽  
Ernst Wintner ◽  
Martin Weinrotter ◽  
Josef Graf ◽  
...  
Keyword(s):  
Power Density ◽  
Test Bench ◽  
New Technologies ◽  
Combustion Stability ◽  
Laser Ignition ◽  
High Power Density ◽  
High Compression Ratio ◽  
High Expectations ◽  
Gas Engine ◽  
Very High

Due to market demands aimed at increasing the efficiency and the power density of gas engines, existing ignition systems are rapidly approaching their limits. To avoid this, gas engine manufacturers are seeking new technologies. From the viewpoint of gas engine R&D engineers, ignition of the fuel/air mixture by means of a laser has great potential. Especially the thermodynamic requirements of a high compression ratio and a high power density are fulfilled well by laser ignition. Results of measurements on the test bench confirm the high expectations — with a BMEP of 1.8 MPa it was possible to verify NOx values of a non-optimized system of 30 ppm (70 mg/Nm3 @ 5 % O2) with very high combustion stability. Despite this, considerable developmental steps are still necessary to adapt the laser ignition concept fully to desired objectives (especially costs).

Very high-power-density CW operation of GaAs/AlGaAs microwave heterojunction bipolar transistors

1993 ◽  
Vol 14 (10) ◽  
pp. 493-495 ◽  
Author(s):  
B. Bayraktaroglu ◽  
J. Barrette ◽  
L. Kehias ◽  
C.I. Huang ◽  
R. Fitch ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
Heterojunction Bipolar Transistors ◽  
Bipolar Transistors ◽  
High Power Density ◽  
Cw Operation ◽  
Very High

Development of an Open Path Laser Ignition System for a Large Bore Natural Gas Engine: Part 2 — Single Cylinder Demonstration

2005 ◽  
Author(s):  
David L. Ahrens ◽  
Daniel B. Olsen ◽  
Azer P. Yalin
Keyword(s):  
Natural Gas ◽  
Combustion Stability ◽  
Electrode Erosion ◽  
Laser Ignition ◽  
Engine Test ◽  
Test Results ◽  
Ignition System ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Spark Plug

Using a laser, as opposed to a conventional (electrical) spark plug, to create a combustion initiating spark is potentially advantageous for several reasons: flexibility in choosing and optimizing the spark location, in particular to move the spark away from solid heat sinks; production of a more robust spark containing more energy; and obviation of electrode erosion problems. In this paper we present the on-engine test results of the laser ignition system on a large bore natural gas engine. Test results include: mass fraction burn duration, hydrocarbon emissions data, and combustion stability comparisons to the conventional spark plug ignition system. Design and spark location considerations for the laser ignition system were presented in the first paper of this two-paper series.

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