High Performance Engine Warm-Up Thermo-Fluid-Dynamic Analysis

2008 ◽  
Author(s):  
Adolfo Senatore ◽  
Massimo Cardone ◽  
Dario Buono ◽  
Agostino Dominici
Keyword(s):  
Heat Exchange ◽  
High Performance ◽  
Cooling System ◽  
Fluid Dynamic ◽  
Specific Power ◽  
Warm Up ◽  
Engine Cooling ◽  
High Specific Power ◽  
Increasing Demand ◽  
Power Outputs

Luxury car market is characterized by a more and more increasing demand of high performance engines, and this requires high specific power outputs and a continuous evolution of technical solutions. This trend implies consequently, higher amounts of heat to be released from the cooling system. The latter requires special care in design since it must release as much heat as possible from the engine without compromising the aerodynamic performance of the car. In this paper the results of thermo-fluid-dynamic model of an 8 cylinder high-performance engine cooling system are shown. The model has been validated by both thermal and hydraulic experimental data. In particular, this study has been carried out on simulation of the warm up procedure and deep attention was given to the thermostat behavior and to the heat exchange phenomena during this procedure. The goal of this activity was not only to perform a dedicated simulation model to analyze the complex heat exchange phenomena and to highlight eventual critical aspects, but also to define a methodology to optimize the cooling system and its components.

Thermo-Fluid-dynamic Analysis of a High Performance Engine Cooling System

2007 ◽  
Author(s):  
A. Senatore ◽  
M. Cardone ◽  
D. Buono ◽  
E. Pulci Doria ◽  
A. Dominici
Keyword(s):  
Dynamic Analysis ◽  
High Performance ◽  
Cooling System ◽  
Fluid Dynamic ◽  
Engine Cooling

Fluid-Dynamic Analysis of Motorbike Race Engine Injection System

2008 ◽  
Author(s):  
Adolfo Senatore ◽  
Massimo Cardone ◽  
Dario Buono ◽  
Mario Manganelli
Keyword(s):  
Experimental Data ◽  
Fluid Dynamic ◽  
Injection System ◽  
Specific Power ◽  
Design Data ◽  
Good Reliability ◽  
Commercial Code ◽  
High Specific Power ◽  
In The Beginning ◽  
Simulated Analysis

The working conditions of all components of a competition engine are very hard: they must assure durability and reliability during a race where the running conditions changes very rapidly. The injection system of a competition engine must ensure a great amount of injected fuel and a great precision about control (timing and quantity) of the injected fuel. In this paper a simulated analysis of a competition engine injection system is shown. The engine was developed by the race team of Aprilia and it will be employed in 4 stroke racing application. The simulation model of the injection system was accurately validated by experimental data. The model was performed by a mono-dimensional and commercial code, which ensures a good reliability and fast calculation times. The model was performed during the engine development, so in the beginning of this activity only design data was used to realize the model. In the first step only experimental data performed on system components by their own manufacturers was used to calibrate the model then, when the engine was realized and tested on an experimental bench, the model was validated by dedicated experimental test performed on the injection system. The model was used to test several design solutions, in particular it was used during the design and the choice of the injectors, furthermore it was used to test several system configurations. This model is an interesting example of a modellistic approach and methodology that could be employed during the development of a new engine and its components of high specific power.

Automotive Thermostat Valve Configurations: Enhanced Warm-Up Performance

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
T. Mitchell ◽  
M. Salah ◽  
J. Wagner ◽  
D. Dawson
Keyword(s):  
Cooling System ◽  
Combustion Engine ◽  
Experimental Testing ◽  
Engine Performance ◽  
Coolant Temperature ◽  
Warm Up ◽  
Engine Cooling ◽  
Temperature Tracking ◽  
Smart Thermostat ◽  
Electric Radiator

The automotive cooling system has unrealized potential to improve internal combustion engine performance through enhanced coolant temperature control and reduced parasitic losses. Advanced automotive thermal management systems use controllable actuators (e.g., smart thermostat valve, variable speed water pump, and electric radiator fan) that must work in harmony to control engine temperature. One important area of cooling system operation is warm-up, during which fluid flow is regulated between the bypass and radiator loops. A fundamental question arises regarding the usefulness of the common thermostat valve. In this paper, four different thermostat configurations were analyzed, with accompanying linear and nonlinear control algorithms, to investigate warm-up behaviors and thermostat valve operations. The configurations considered include factory, two-way valve, three-way valve, and no valve. Representative experimental testing was conducted on a steam-based thermal bench to examine the effectiveness of each valve configuration in the engine cooling system. The results clearly demonstrate that the three-way valve has the best performance as noted by the excellent warm-up time, temperature tracking, and cooling system power consumption.

Simulation Research of Engine Cooling System

2012 ◽  
Vol 442 ◽  
pp. 224-228 ◽  
Author(s):  
Xiao Jie Chen
Keyword(s):  
High Performance ◽  
Cooling System ◽  
Simulation System ◽  
System Structure ◽  
Temperature Decrease ◽  
Simulation Research ◽  
Engine Cooling

The engine cooling system is very important for engine working efficiently. Using AMEsim software to simulate the cooling system can make it easily and clearly. So the simulation system is built. The engine cooling system structure is given first, and the model followed. The influence of the heat component and the fan operating is studied also. Through the analysis of the cooling system, we know that with the help of fan, the system can get additional air in the radiator and make the temperature decrease onsequently. This is very useful to make engine working in high performance.

Improved Estimation of Subcooled Flow Boiling Heat Flux for Automotive Engine Cooling Applications

2019 ◽  
Author(s):  
Sudharsan Vasudevan ◽  
Sassan Etemad ◽  
Lars Davidson
Keyword(s):  
Heat Flux ◽  
Internal Combustion Engines ◽  
Flow Boiling ◽  
Bubble Nucleation ◽  
Specific Power ◽  
Subcooled Flow Boiling ◽  
Automotive Engine ◽  
Engine Cooling ◽  
Subcooled Flow ◽  
High Specific Power

Abstract Tapping the potential of subcooled flow boiling can be the key strategy for enhanced cooling of modern day internal combustion engines with high specific power. Accurate prediction of the boiling heat flux is a prerequisite for employing such strategy and to avoid stepping into the dangerous film boiling regime. The complexity involved in the boiling phenomena makes it difficult to develop a model that accounts for all the dominant mechanisms. However, boiling models available in literature provide a good estimate of the heat flux within their range of applicability. This work attempts to introduce a blending based on probability of bubble nucleation to blend two different models developed for different boiling regimes. Corroboration of results with experiments show improved estimation of boiling heat flux.

A Numerical Procedure for the Evaluation of the Engine Head-Cylinder Group Cooling Effectiveness

2009 ◽  
Author(s):  
Marco Antonelli ◽  
Luigi Martorano ◽  
Alessio Simi ◽  
Stefano Di Palma ◽  
Carlo Carapellucci
Keyword(s):  
Heat Transfer ◽  
Gasoline Engine ◽  
Cooling System ◽  
Fluid Dynamic ◽  
Thermal Power ◽  
Numerical Procedure ◽  
Heat Fluxes ◽  
Specific Power ◽  
Simple Modification ◽  
Cooling Circuit

The purpose of this paper is to investigate the thermal flows and heat transfer phenomena occurring in the cooling circuit of a high specific power engine and to suggest a valid method to evaluate its effectiveness in keeping the temperature below a safety limit even in the highest thermal power points. This is a first work showing the analysis of the cooling circuit of a small single-cylinder, four-stroke, high power density gasoline engine carried out with a numerical three-dimensional CFD analysis by means of a CFD conjugate simulation, whose boundary conditions have been taken from a validated one-dimensional fluid dynamic engine model. Once its validity has been assessed by the comparison between the simulation results and data collected by literature and experiments, the interest for this procedure relies on the fact that heat fluxes are directly calculated by the CFD code through the knowledge of gas temperatures and convective heat transfer coefficients. Hence an arbitrary, a priori subdivision of the total heat flux released by fuel combustion into heat converted into mechanical work, heat released to the cooling system, heat rejected to the exhaust, etc. can be avoided; at the same time, the model provides the proper distribution of the heat rejected to the various surfaces constituting the water jackets. The evaluation of the effectiveness of the cooling system is then directly performed in terms of temperature distribution. By this way, once the engine has been designed from a fluid dynamic and mechanical point of view, the effectiveness of the cooling system can be immediately verified through the application of the described procedure. This study takes into consideration the evaluation of average and instantaneous heat transfer coefficient and in-cylinder gas temperature through the use of a validated 1D CFD model, the analysis of the temperature field by means of a conjugate heat transfer simulation of the whole head and cylinder group and an example of the application of this procedure for the evaluation of a simple modification of the cooling system.

Active Shutters of the Internal Combustion Engine Cooling System of a Passenger Car

2019 ◽  
pp. 44-51 ◽  
Author(s):  
A.P. Petrov ◽  
S.N. Bannikov
Keyword(s):  
High Efficiency ◽  
Aerodynamic Drag ◽  
Cooling System ◽  
Combustion Engine ◽  
Air Conditioning System ◽  
Warm Up ◽  
Engine Cooling ◽  
Air Supply ◽  
Reduce Emissions ◽  
Cooling Air

The practice of using active shutters in the modern automotive industry is analyzed in this work, and the high efficiency of such systems is emphasized. It is also noted that by using active shutters the aerodynamic drag of the car can be reduced by 6–10 %. The reduction in the engine’s warm-up time provides faster heating of the car interior. All this helps to save fuel and reduce emissions of harmful substances into the atmosphere. The possibility of utilizing the radiator’s active shutters with two autonomously controlled sections is considered. CFD numerical modelling is used to conduct the research, and the potential of the proposed active shutters design is determined. The research has shown that besides the high efficiency, the proposed shutters system has a simpler design and reliability associated with several factors. Due to the vertical arrangement of the slats, the shutters do not reduce the efficiency of the engine’s cooling system and the air conditioning system in the passenger compartment. Unlike in the existing designs, in the proposed system the cooling air supply is regulated by separate opening or closing of two independent sections.

Oil Free 8 kW High-Speed and High Specific Power Turbogenerator

2014 ◽  
Author(s):  
Hooshang Heshmat ◽  
James F. Walton ◽  
Andrew Hunsberger
Keyword(s):  
High Speed ◽  
High Performance ◽  
Modular Design ◽  
Preliminary Test ◽  
Specific Power ◽  
Design System ◽  
Turbine Engine ◽  
Foil Bearings ◽  
High Specific Power ◽  
And Performance

In the paper the authors will present the design and preliminary test results for a high specific power (i.e., kW/kg) fully integrated and completely oil-free gas turbine driven electric generating system that operates with commercially available heavy fuel. The oil-free, high-speed micro-turboalternator system achieves high specific power through operating speeds to 180,000 rpm and the use of compliant foil bearings, high performance compressor and turbine and a permanent magnet alternator. The high operating temperatures and speeds require that oil-free compliant foil bearings be used and that the alternator section be isolated from the turbine engine portion of the system. The selected modular design approach, including compressor and turbine aerodynamic design, system thermal management issues and the corresponding impact on rotor bearing system dynamics, will all be presented. The paper concludes with a presentation of preliminary testing results showing stable full speed operation and peak power generated. Data obtained compares well with design predictions both from a rotordynamic and with regard to the cycle efficiency and performance. Conclusions regarding the ability to scale the technology to even smaller systems will also be presented.

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