Laser-assisted homogeneous charge ignition in a constant volume combustion chamber |
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Authors: | Dhananjay Kumar Srivastava Martin Weinrotter Henrich Kofler Avinash Kumar Agarwal Ernst Wintner |
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Institution: | 1. Engine Research Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kanpur, IIT Kanpur, Kanpur, UP-208016, India;2. Institute for Photonics, Technical University of Vienna, Gusshausstrasse 27/387, Vienna, Austria |
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Abstract: | Homogeneous charge compression ignition (HCCI) is a very promising future combustion concept for internal combustion engines. There are several technical difficulties associated with this concept, and precisely controlling the start of auto-ignition is the most prominent of them. In this paper, a novel concept to control the start of auto-ignition is presented. The concept is based on the fact that most HCCI engines are operated with high exhaust gas recirculation (EGR) rates in order to slow-down the fast combustion processes. Recirculated exhaust gas contains combustion products including moisture, which has a relative peak of the absorption coefficient around 3 μm. These water molecules absorb the incident erbium laser radiations (λ=2.79 μm) and get heated up to expedite ignition. In the present experimental work, auto-ignition conditions are locally attained in an experimental constant volume combustion chamber under simulated EGR conditions. Taking advantage of this feature, the time when the mixture is thought to “auto-ignite” could be adjusted/controlled by the laser pulse width optimisation, followed by its resonant absorption by water molecules present in recirculated exhaust gas. |
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