A Simulation study of cooling system for heavy duty diesel engine

The main function of the cooling system is to control the temperature of the engine components and improve the performance of an engine. To know the flow and temperature distribution in the jacket cooling system for 6 cylinder diesel engine is analyzed using 1 dimensional method by using GT-Suite 1D simulation software package. The present work employs 1D simulation of water jacket in GT-ISE to perform a comprehensive study of mass-flow and thermal distribution over the inlet of the cooling package of a selected engine in several steady state operating points. The results show, that the suggested predictive method successfully captures the thermal effect of recirculation while reducing the necessity for calibration done by prototype testing.

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A Study of the Character and Deposition Rates of Sulfur Species in the EGR Cooling System of a Heavy-Duty Diesel Engine

10.4271/1999-01-3566 ◽

1999 ◽

Cited By ~ 18

Author(s):

James W. Girard ◽

Linda D. Gratz ◽

John H. Johnson ◽

Susan T. Bagley ◽

David G. Leddy

Keyword(s):

Diesel Engine ◽

Cooling System ◽

Heavy Duty ◽

Sulfur Species ◽

Deposition Rates ◽

Heavy Duty Diesel Engine ◽

Heavy Duty Diesel

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A Fast Coupled CFD-Thermal Analysis of a Heavy Duty Diesel Engine Water Cooling System

Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C ◽

10.1115/imece2008-68163 ◽

2008 ◽

Cited By ~ 1

Author(s):

Mazdak Jafarabadi ◽

Hamidreza Chamani ◽

Amir Malakizadi ◽

Seyed Ali Jazayeri

Keyword(s):

Heat Transfer ◽

Thermal Analysis ◽

Heat Flux ◽

Diesel Engine ◽

Cooling System ◽

Nucleate Boiling ◽

Heavy Duty ◽

Engine Cooling ◽

Heavy Duty Diesel Engine ◽

Heavy Duty Diesel

In recent years, the design of an efficient cooling system together with good thermal efficiency for a new engine is becoming a critical task and therefore the need for an accurate and fast thermo-fluid simulation of engine cooling system is of vital importance. In this study, a detailed CFD and thermal FE simulation of a 12 cylinders V-type medium speed heavy duty diesel engine cooling system has been carried out using ANSYS-CFX commercial code. At first, a global model, for one bank with six cylinders, has been simulated using appropriate mesh density which ensures the accuracy of the results together with reasonable computational time. At this stage, the worst cylinder has been selected based on the wall temperature and the cooling flow rate. Later, using the inlet and outlet boundary conditions extracted from the global model, a series of detailed thermo-fluid analyses have been conducted for the worst cylinder with a finer mesh. The subcooled nucleate boiling heat transfer computation is carried out using the boiling departure lift-off (BDL) model, in which the total heat flux is assumed to be additively composed of a forced convective and a nucleate boiling component. In order to obtain the temperature field for components under consideration, a comprehensive thermal analysis has been preformed coupling with the detailed CFD analyses to reach an accepted value through transferring data between the CFD and FEA software. This method leads to an accurate prediction of the wall temperature and heat flux. It is observed that at hot spots, nucleate boiling occurs for low coolant flow regions specifically around the cylinder head’s exhaust port and liner coolant side wall. Also a considerable increment in the Heat Transfer Coefficient (HTC) has been observed on the superheated regions where the boiling is initiated.

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Optimisation of torsional vibration system for a heavy-duty inline six-cylinder diesel engine

Proceedings of the Institution of Mechanical Engineers Part K Journal of Multi-body Dynamics ◽

10.1177/1464419319826744 ◽

2019 ◽

Vol 233 (3) ◽

pp. 642-656 ◽

Cited By ~ 2

Author(s):

H Karimaei ◽

M Mehrgou ◽

HR Chamani

Keyword(s):

Diesel Engine ◽

Torsional Vibration ◽

High Sensitivity ◽

Heavy Duty ◽

Heavy Duty Diesel Engine ◽

Coupling Stiffness ◽

Heavy Duty Diesel ◽

Operating Points ◽

Initial Selection ◽

Selection Of

Torsional vibration is one of the major issues and very important calculation for the safe running of heavy-duty diesel engines, specifically crankshaft. Because of different applications of a heavy-duty diesel engine, different driven machine and different attaching systems are inevitable that affect the torsional system. The cranktrain contains the flywheel and torsional damper. The properties of these parts have significant effect on torsional vibration of the system as well as the crankshaft strength. Initial selection of these properties is usually specified based on engine designer experience and also the torsional vibration calculation of the cranktrain. In this paper, the focus is to find the optimum and reliable operating points for the elements in cranktrain using computer-aided engineering (CAE) tools. These are parameters like tuned mass inertia, flywheel inertia, damper stiffness, damper inertia, damper damping, coupling damping and coupling stiffness. The effect of these parameters on system design criteria, especially crankshaft life, was investigated. The results show high sensitivity of crankshaft safety factor to parameters like tuned mass inertia, damper damping coefficient and damper stiffness. Therefore, damper selection is the most important factor to increase the crankshaft life. The new contribution is that the parameters related to the whole cranktrain system that have the greatest effect were obtained and an optimisation was executed on these parameters to fulfil the vibration targets as well crankshaft life.

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