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COMPUTATIONAL ANALYSIS OF EGR MIXING INSIDE THE INTAKE SYSTEM & EXPERIMENTAL INVESTIGATION ON DIESEL ENGINE FOR LCV

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Author(s): S. KARTHIKEYAN, | R. HARIGANESH, | M.SATHYANDAN | S. KRISHNAN, | P. VADIVEL, | D.VAMSIDHAR

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 3;
Issue: 3;
Start page: 2350;
Date: 2011;
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Keywords: Exhaust Gas Recirculation (EGR) | Diesel engine | Intake Manifold | Half bluff body.

ABSTRACT
This paper emphasizes use of Computational Fluid Dynamics (CFD) technique for evaluating the effectiveness of an intake system design for homogeneous mixing of Exhaust Gas Recirculation (EGR) with fresh air inside the intake system i.e. inlet-manifold and duct. Modern diesel engines are commonly turbocharged, in such case proper mixing will take place only when the turbine upstream pressure is sufficiently higher than the boost pressure. In case the pressure difference is not enough to meet the engine requirements an alternate solution must be arrived by either increasing the turbine upstreampressure or reducing the boost pressure locally by providing the bstruction in the air flow passage inside the duct without affecting the engine performance. As part of this study, five different novel concepts for mixing is analyzed computationally at 1800 rpm to meet the above requirement. From the five different concepts the optimized inlet manifold with larger injection area and half bluff body concept has given increased air and EGR mixing rate computationally. herefore using this concept the smoke level is experimentally investigated on the engine for different load conditions.
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