scholarly journals Infrared Borescopic Evaluation of High-Energy and Long-Duration Ignition Systems for Lean/Dilute Combustion in Heavy-Duty Natural-Gas Engines

2018 ◽  
Author(s):  
Ahmet Mazacioglu ◽  
Michael Gross ◽  
Justin Kern ◽  
Volker Sick
Keyword(s):  
Natural Gas ◽  
High Energy ◽  
Heavy Duty ◽  
Natural Gas Engines ◽  
Long Duration

Railplug Design Optimization to Improve Large-Bore Natural Gas Engine Performance

2005 ◽  
Author(s):  
Hongxun Gao ◽  
Matt J. Hall ◽  
Ofodike A. Ezekoye ◽  
Ron D. Matthews
Keyword(s):  
Natural Gas ◽  
High Energy ◽  
Parameter Study ◽  
Transfer Model ◽  
High Speed Photography ◽  
Discharge Process ◽  
Ignition System ◽  
Gas Engine ◽  
Natural Gas Engines ◽  
Natural Gas Engine

It is a very challenging problem to reliably ignite extremely lean mixtures, especially for the low speed, high load conditions of stationary large-bore natural gas engines. If these engines are to be used for the distributed power generation market, it will require operation with higher boost pressures and even leaner mixtures. Both place greater demands on the ignition system. The railplug is a very promising ignition system for lean burn natural gas engines with its high-energy deposition and high velocity plasma jet. High-speed photography was used to study the discharge process. A heat transfer model is proposed to aid the railplug design. A parameter study was performed both in a constant volume bomb and in an operating natural gas engine to improve and optimize the railplug designs. The engine test results show that the newly designed railplugs can ensure the ignition of very lean natural gas mixtures and extend the lean stability limit significantly. The new railplug designs also improve durability.

Methane Dedicated Catalysts for Heavy-Duty Natural Gas Engines

1996 ◽  
Author(s):  
P. Corbo ◽  
M. Gambino ◽  
S. Iannaccone
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Natural Gas Engines

Use of Railplugs to Extend the Lean Limit of Natural Gas Engines

2004 ◽  
Author(s):  
Hongxun Gao ◽  
Ron Matthews ◽  
Sreepati Hari ◽  
Matt Hall
Keyword(s):  
Natural Gas ◽  
Stability Limit ◽  
High Energy ◽  
Lean Burn ◽  
Ignition System ◽  
Natural Gas Engines ◽  
Natural Gas Engine ◽  
Spark Plug ◽  
Lean Mixtures ◽  
Ignition Characteristics

Ignition of extremely lean mixtures is a very challenging problem, especially for the low speed, high load conditions of large-bore natural gas engines. This paper presents initial results from testing a high energy ignition system, the railplug, which can assure ignition of very lean mixtures by means of its high energy deposition and high velocity jet of the plasma. Comparisons of natural gas engine tests using both a spark plug and a railplug are presented and discussed in this paper. The preliminary engine test show that the lean stability limit (LSL) can be extended from an equivalence ratio, φ, of ∼0.63 using a spark plug down to 0.56 using a railplug. The tests show that the railplug is very promising ignition system for lean burn natural gas engines and potentially for other engines that operate with very dilute mixtures. The ignition characteristics of different railplug geometric and circuit designs are also discussed.

Evolution of Heavy Duty Natural Gas Engines - Stoichiometric, Carbureted and Spark Ignited to Lean Burn, Fuel Injected and Micro-Pilot

1997 ◽  
Author(s):  
N. John Beck ◽  
Robert L. Barkhimer ◽  
William P. Johnson ◽  
Hoi C. Wong ◽  
Kresimir Gebert
Keyword(s):  
Natural Gas ◽  
Heavy Duty ◽  
Lean Burn ◽  
Natural Gas Engines
Sign in / Sign up

Export Citation Format

Share Document