Torch Ignition: Ideal for Lean Burn Premixed-Charge EnginesSource: Journal of Engineering for Gas Turbines and Power:;1994:;volume( 116 ):;issue: 004::page 793DOI: 10.1115/1.2906887Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Sluggish flame initiation and propagation, and even potential misfiring, become major problems with lean-fueled, premixed-charge, spark-ignited engines. This work studies torch ignition as a means for improving combustion, fuel economy, and emissions of a retrofitted, large combustion chamber with nonideal spark plug location. A number of alternative configurations, employing different torch chamber designs, spark-plug locations, and materials, were tested under full-load and part-load conditions. Results indicate a considerable extension of the lean operating limit of the engine, especially under part-load conditions. In addition, torch ignition can lead to substantial thermal efficiency gains for either leaner or richer air-fuel ratios than the optimum for the conventional ignition system. On the richer side, in particular, the torch-ignited engine is capable of operating at maximum brake torque spark timings, rather than compromised, knock-limited spark timings used with conventional ignition. This translates into thermal efficiency improvements as high as 8 percent at an air-fuel ratio of 20:1 and full load.
keyword(s): Engines , Ignition , Stress , Fuels , Torque , Combustion , Combustion chambers , Flames , Fuel efficiency , Emissions AND Brakes ,
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contributor author | N. S. Mavinahally | |
contributor author | D. N. Assanis | |
contributor author | K. R. Govinda Mallan | |
contributor author | K. V. Gopalakrishnan | |
date accessioned | 2017-05-08T23:44:04Z | |
date available | 2017-05-08T23:44:04Z | |
date copyright | October, 1994 | |
date issued | 1994 | |
identifier issn | 1528-8919 | |
identifier other | JETPEZ-26733#793_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/113522 | |
description abstract | Sluggish flame initiation and propagation, and even potential misfiring, become major problems with lean-fueled, premixed-charge, spark-ignited engines. This work studies torch ignition as a means for improving combustion, fuel economy, and emissions of a retrofitted, large combustion chamber with nonideal spark plug location. A number of alternative configurations, employing different torch chamber designs, spark-plug locations, and materials, were tested under full-load and part-load conditions. Results indicate a considerable extension of the lean operating limit of the engine, especially under part-load conditions. In addition, torch ignition can lead to substantial thermal efficiency gains for either leaner or richer air-fuel ratios than the optimum for the conventional ignition system. On the richer side, in particular, the torch-ignited engine is capable of operating at maximum brake torque spark timings, rather than compromised, knock-limited spark timings used with conventional ignition. This translates into thermal efficiency improvements as high as 8 percent at an air-fuel ratio of 20:1 and full load. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Torch Ignition: Ideal for Lean Burn Premixed-Charge Engines | |
type | Journal Paper | |
journal volume | 116 | |
journal issue | 4 | |
journal title | Journal of Engineering for Gas Turbines and Power | |
identifier doi | 10.1115/1.2906887 | |
journal fristpage | 793 | |
journal lastpage | 798 | |
identifier eissn | 0742-4795 | |
keywords | Engines | |
keywords | Ignition | |
keywords | Stress | |
keywords | Fuels | |
keywords | Torque | |
keywords | Combustion | |
keywords | Combustion chambers | |
keywords | Flames | |
keywords | Fuel efficiency | |
keywords | Emissions AND Brakes | |
tree | Journal of Engineering for Gas Turbines and Power:;1994:;volume( 116 ):;issue: 004 | |
contenttype | Fulltext |