Improvement of Engine Cooling Performance by Cooling Airflow Visualization

1969 ◽

Vol 184 (1) ◽

pp. 117-124 ◽

Cited By ~ 1

Author(s):

S. R. G. Taylor

Keyword(s):

Coolant Temperature ◽

Analytical Prediction ◽

Cooling Performance ◽

Pump Speed ◽

Power Characteristics ◽

Engine Cooling ◽

System Pressure ◽

Component Design ◽

Additional Resistance ◽

Water Pumps

To improve economically the cooling performance of trucks an analytical approach was used to assist development. The component tests undertaken included the complete net pressure and power characteristics of two engine water pumps and four engine fans, the heat transfer and pressure drop performances over appropriate flow ranges of some 14 radiators, the additional resistance to air flow offered by two noise shields, and studies of the effects of pump speed, coolant temperature, system pressure, thermostat resistance, and by-pass resistance on radiator water flow with three different engines. The apparatus and methods used for each type of test are outlined. Using the above and other existing data, cooling performance was predicted for some 80 different configurations and conditions, and fan power consumption was predicted for several of these. These results enabled component design and manufacturing problems to be identified and the selection of the most promising configurations for actual development testing. The agreement between the predicted and actual cooling performances is discussed. The use of computer programmes in component testing and analytical prediction is mentioned, and various possible developments in future cooling systems of still higher performance are discussed.

Download Full-text

Improvement of Engine Cooling Performance for a Construction Truck using Numerical and Experimental Methods

10.4271/2010-01-2054 ◽

2010 ◽

Cited By ~ 4

Author(s):

Cenk Dinc ◽

Ozgur Arslan ◽

Tolga Akgun ◽

Roger Almenar

Keyword(s):

Experimental Methods ◽

Cooling Performance ◽

Engine Cooling

Download Full-text

Experimental Evaluation of the Density Ratio Effects on the Cooling Performance of a Combined Slot/Effusion Combustor Cooling System

ISRN Aerospace Engineering ◽

10.1155/2013/423190 ◽

2013 ◽

Vol 2013 ◽

pp. 1-14 ◽

Cited By ~ 5

Author(s):

Antonio Andreini ◽

Gianluca Caciolli ◽

Bruno Facchini ◽

Lorenzo Tarchi

Keyword(s):

Heat Transfer ◽

Working Conditions ◽

Film Cooling ◽

Cooling System ◽

Velocity Ratio ◽

Density Ratio ◽

Cooling Performance ◽

Engine Cooling ◽

Flow Parameters ◽

Adiabatic Effectiveness

The purpose of this study is to investigate the effects of coolant-to-mainstream density ratio on a real engine cooling scheme of a combustor liner composed of a slot injection and an effusion array with a central dilution hole. Measurements of heat transfer coefficient and adiabatic effectiveness were performed by means of steady-state thermochromic liquid crystals technique; experimental results were used to estimate, through a 1D thermal procedure, the Net Heat Flux Reduction and the overall effectiveness in realistic engine working conditions. To reproduce a representative value of combustor coolant-to-mainstream density ratio, tests were carried out feeding the cooling system with carbon dioxide, while air was used in the main channel; to highlight the effects of density ratio, tests were replicated using air both as coolant and as mainstream and results were compared. Experiments were carried out imposing values of effusion blowing and velocity ratios within a range of typical modern engine working conditions. Results point out the influence of density ratio on film cooling performance, suggesting that velocity ratio is the driving parameter for the heat transfer phenomena; on the other hand, the adiabatic effectiveness is less sensitive to the cooling flow parameters, especially at the higher blowing/velocity ratios.

Download Full-text

Assessment of Engine Cooling Performance by Measurement of Cooling Airflow Drag in Aerodynamic Wind Tunnels

10.4271/980428 ◽

1998 ◽

Cited By ~ 5

Author(s):

F. Chometon ◽

P. Gilliéron

Keyword(s):

Wind Tunnels ◽

Cooling Performance ◽

Engine Cooling

Download Full-text

Improvement of a Diesel Engine Water Cooling Performance Through Implementation of Different Cooling Designs

Volume 2: Fuels; Numerical Simulation; Engine Design, Lubrication, and Applications ◽

10.1115/icef2013-19212 ◽

2013 ◽

Cited By ~ 1

Author(s):

Mazdak Jafarabadi ◽

Hamidreza Chamani ◽

Seyed Ali Jazayeri

Keyword(s):

Diesel Engine ◽

Wall Temperature ◽

Thermal Efficiency ◽

Cylinder Head ◽

Nucleate Boiling ◽

Cooling Performance ◽

Advantages And Disadvantages ◽

Engine Cooling ◽

Cooling Design ◽

Face Cooling

Improving engine cooling performance requires sophisticated and intelligent engine cooling design especially when interactions of all engine parts are to be considered. The cooling system would highly influence engine thermal efficiency, durability and engine design criteria. Several attempts have been made by engine designers to improve the cooling design during the past decades, each with particular purpose considerations. In this paper, based on the cylinder head flame face of an existing heavy duty medium speed diesel engine, three other flame face cooling systems are designed, modeled and changes are implemented using a three dimensional computer aided design modeling software. Modeled cylinder head flame face cooling concepts are experiencing the effect of cooling passages geometry changes on performance of thermal efficiency, effective subcooled regions and other resultant factors. A detailed coupled computational fluid dynamic and thermal finite element analysis for one cylinder bank assembly is performed several times; paying special attention to the risky areas to get comparative results to assess the flame face cooling designs. Engine specifications and loading conditions together with the engine performance data are available from test rig. Initial and boundary conditions have been determined through a global model simulation and analysis. The subcooled nucleate boiling heat transfer computation is carried out using the boiling departure lift-off model. In order to obtain the temperature for components under consideration, a comprehensive thermal analysis has been performed coupling with the detailed CFD analysis 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 proper cooling design could improve wall temperature and thermal stress related phenomena significantly. The advantages and disadvantages of each concept are discussed and preferred flame face design is demonstrated. Calculated results of original design are validated with test cell records.

Download Full-text