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DESIGN & ANALYSIS OF INDIVIDUAL EXHAUST SYSTEM FOR IMPROVING TRANSIENT RESPONSE OF A TURBO DIESEL ENGINEBYISHAN DEV PARIKSHIT BAJPAI PUSHKAR SHUKLA SANDEEP KR. MISHRAJSS MAHAVIDYAPEETHAJSS ACADEMY OF TECHNICAL EDUCATION, NOIDADEPARTMENT OF MECHANICAL ENGINEERING2014-2015IntroductionTurbo-diesel refers to any diesel engine equipped with a turbocharger.

Turbo-diesels in automobiles offer a higher refinement levels than their naturally aspirated counterparts.

In power boosting of engines, the application of conventional turbochargers could realize only a limited improvement because it is effective in a narrow flow range.

One of the main handicaps of turbocharged diesel engines is their low dynamic response, in the low speed range, compared with spark ignition ones.

Improving the dynamic performance of turbocharged diesel engine, by energy saving in the turbocharger acceleration by engine performance modelling during transient operation with individual exhaust configuration.The possible solutions Supplement the usual exhaust-driven turbo with another turbo driven by an electric motor.Using variable-nozzle or twin-scroll turbochargersUsing a turbocharger spool valve to increase exhaust gas flow speed to the turbine.AFE IntakeExhaust Manifold Remodeling.Our Solution Remodeling the existing exhaust system as an individual exhaust manifold in collector configuration.

Objective and Solution OptionsExhaust Manifold Design

Stock Exhaust ManifoldModelled Exhaust Manifold

Fig: Collector Type Exhaust ManifoldFig: Isometric ViewFlow Analysis of the modelled exhaust manifold.

Number of cells in X26Number of cells in Y12Number of cells in Z12Total cells47599Fluid cells14920Solid cells16050Partial cells16629Irregular cells0Trimmed cells0Calculation Mesh Basic Mesh DimensionsNumber Of Cells

ResultsFlow Analysis: Velocity Variation of a collector style Flow Analysis: Velocity Variation of a log style

Flow Analysis: Pressure Variation of a collector style Flow Analysis: Pressure Variation of a log style

Flow Analysis: Temperature Variation of a collector style NameMinimumMaximumPressure [Pa]71732.21245130.88Temperature [K]833.44996.23Density [kg/m^3]0.270.87Velocity [m/s]0632.824Velocity (X) [m/s]-305.485282.075Velocity (Y) [m/s]-632.436118.746Velocity (Z) [m/s]-180.613377.317Temperature (Fluid) [K]833.44996.23Vorticity [1/s]21.304136785.185Shear Stress [Pa]0850.44Relative Pressure [Pa]-29592.79143805.88Heat Transfer Coefficient [W/m^2/K]00Surface Heat Flux [W/m^2]00Results SummaryFuture WorkDynamic Analysis taking into consideration the effect of firing orderDesign optimization by modifying runner lengths and anglesReferencesGarett T.K., Newton K. and Steeds W., The Motor Vehicle, Butterworth Heinemann, London, 2001Heisler, Heinz, Advanced Engine Technology, SAE, Great Britain, 1995Heywood, John B., Internal Combustion Engine Fundamentals, McGraw-Hill, Inc. New York, 1988Morrison, John C and Smith, Philip H., Scientific Design of Exhaust and Intake Systems. Cambridge, MA, Robert Bentley Publishers, 1972C. Wren, and O. Johnson, Gas Dynamics Simulation for the Design of Intake and Exhaust Systems Latest Techniques SAE Paper No. 951367TG. Blair, D. Mackey, M. Ashe, and G. Chatfield Exhaust Tuning on a Four-Stroke Engine; Experimentation and Simulation SAE Paper No. 2001 01 1797/4218J. Li, L. Zhou, D. Jiang, and K. Pan Frequency Analysis Technique for Intake and Exhaust Manifold Design SAE Paper No. 952070R. Matus, Modeling of Exhaust Systems with CFD SAE Paper No. 941082Ricardo Software. Wave V5P1 Basic Manual. Burr Ridge, Illinois, USA (2003)Ricardo Software. Wave V5P1 Engine Manual. Burr Ridge, Illinois, USA (2003)