Laser Ignition Characteristics of Gox/GH2 and Gox/GCH4 Propellants

2003 ◽  
Author(s):  
Keichi Hasegawa ◽  
Kazuo Kusaka ◽  
Akinaga Kumakawa ◽  
Masahiro Sato ◽  
Makoto Tadano ◽  
...  
Keyword(s):  
Laser Ignition ◽  
Ignition Characteristics

Laser Ignition Characteristics of Mixtures of Aluminium Powder and Explosives

2013 ◽  
Vol 40 (9) ◽  
pp. 0903003
Author(s):  
郝海霞 Hao Haixia ◽  
姚二岗 Yao Ergang ◽  
赵凤起 Zhao Fengqi ◽  
徐司雨 Xu Siyu ◽  
高红旭 Gao Hongxu ◽  
...  
Keyword(s):  
Laser Ignition ◽  
Aluminium Powder ◽  
Ignition Characteristics

Performance Analysis of a Natural Gas Generator Using Laser Ignition

2004 ◽  
Author(s):  
Munidhar S. Biruduganti ◽  
Sreenath B. Gupta ◽  
Bipin Bihari ◽  
Gregory Klett ◽  
Raj Sekar
Keyword(s):  
Natural Gas ◽  
Optical Fibers ◽  
High Pressures ◽  
Gasoline Engine ◽  
Pressure Rise ◽  
Laser Pulses ◽  
Laser Ignition ◽  
Solid Core ◽  
Gas Generator ◽  
Ignition Characteristics

A single cylinder spark ignited gasoline engine was modified to operate with natural gas. In such an engine, laser ignition was successfully demonstrated while transmitting the high-power laser pulses via solid core optical fibers. Subsequently, ignition studies were performed while using laser ignition (LI) and conventional spark ignition (SI). However, due to limitations imposed by the engine hardware the adverse conditions for ignition could not be simulated, i.e., of lean operation and high-pressures. As a result, the scope of the study was limited to comparing LI and SI ignition characteristics at various ignition timings. It was observed that both LI and SI resulted in reliable combustion over all ignition timings. Furthermore, LI resulted in higher rates of pressure rise and higher peak cylinder pressures. However, the higher NOx emissions resulting from such conditions might not be representative as the final performance of an engine as it is determined by optimizing ignition timing and other operating parameters.

Laser Ignition Characteristics of CL-20 Composite Modified Double-Base Propellants

2011 ◽  
Vol 38 (5) ◽  
pp. 0502009
Author(s):  
郝海霞 Hao Haixia ◽  
南宝江 Nan Baojiang ◽  
安亭 An Ting ◽  
徐司雨 Xu Siyu ◽  
赵凤起 Zhao Fengqi ◽  
...  
Keyword(s):  
Laser Ignition ◽  
Ignition Characteristics ◽  
Double Base

205 Ignition Characteristics Of Microwave-enhanced Laser Ignition

2016 ◽  
Vol 2016.91 (0) ◽  
pp. 78-81
Author(s):  
Chen LIU ◽  
Jun HAYASHI ◽  
Yusuke SAWADA ◽  
Fumiteru AKAMATSU ◽  
Atsushi NISHIYAMA ◽  
...  
Keyword(s):  
Laser Ignition ◽  
Ignition Characteristics

scholarly journals Effect of flow velocity and temperature on ignition characteristics in laser ignition of natural gas and air mixtures

2015 ◽  
Vol 66 ◽  
pp. 132-137 ◽  
Author(s):  
J. Griffiths ◽  
M.J.W. Riley ◽  
A. Borman ◽  
C. Dowding ◽  
A. Kirk ◽  
...  
Keyword(s):  
Natural Gas ◽  
Flow Velocity ◽  
Laser Ignition ◽  
Ignition Characteristics

Ignition Characteristics of Methane-Air Mixtures at Elevated Temperatures and Pressures

2005 ◽  
Author(s):  
Gregory M. Klett ◽  
Sreenath Gupta ◽  
Bipin Bihari ◽  
Raj Sekar
Keyword(s):  
High Pressures ◽  
Elevated Temperatures ◽  
Current Knowledge ◽  
Laser Ignition ◽  
Rapid Compression Machine ◽  
Lean Burn ◽  
Engine Design ◽  
Mode Of Operation ◽  
Ignition Characteristics ◽  
Lean Conditions

Lean operation of natural gas fired reciprocating engines has been the preferred mode of operation as it allows low NOx emissions and simultaneous high overall efficiencies. In such engines, the operation point is often close to where the ignition boundary and the knock limiting boundary cross-over. While knocking is, to a large extent, limited by engine design, ignition of lean-mixtures is limited by the mode of ignition. Since significant benefits can be achieved by extending the lean-ignition limits, many groups have been researching alternate ways to achieve ignition reliably. One of the methods, laser ignition, appears promising as it achieves ignition at high pressures and under lean conditions relatively easily. However, most of the current knowledge about laser ignition is based on measurements performed at room temperature. In this paper, ignition studies on methane-air mixtures under in-cylinder conditions are presented. A Rapid Compression Machine (RCM) was designed to reproduce typical in-cylinder, conditions of high temperature (∼ 490°C) and pressure (∼ 77 Bar) at the time of ignition. Experiments were performed comparing conventional coil based ignition (CDI) and laser ignition on methane-air mixtures while varying pressure and equivalence ratio systematically. It was observed that substantial gains are possible with the use of laser ignition as it extends the lean-ignition limit to the flammability limit, i.e., φ = 0.5. On the other hand, conventional CDI ignition could not ignite mixtures leaner than φ = 0.6. Also, faster combustion times and shorter ignition delays were observed in the case of laser ignition. Through scans performed for minimum required laser energies (MRE), it was noted that the measured values were substantially higher than those reported elsewhere. However, the trends of these values indicate that a laser ignition system designed for φ = 0.65 will successfully operate under all other equivalence ratios of a typical lean-burn engine.

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