Simulation of Cooling Airflow under Different Driving Conditions

Alajbegovic, Ales; Xu, Bin; Константинов, А Ю; Amodeo, Joe; Jansen, Wilko

doi:10.4271/2007-01-0766

Cited by 32 publications

(10 citation statements)

References 17 publications

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“…The resulting methodology allows a large number of rapid 1-D solutions to be performed based on relatively few 3-D simulations. Aerodynamic simulations of the external flow field together with flows through the under-hood and under-body areas over Land Rover LR3 and Ford Mondeo cars have been conducted by Alajbegovic et al (2007). The approach is based on a Lattice-Boltzmann Method and provides accurate predictions of both the cooling airflow and external aerodynamics.…”

Section: Introductionmentioning

confidence: 99%

Computational Aerodynamic Study of Automotive Cooling Fan in Blocked Conditions

Baniasadi¹,

Aydın²,

Dinçer³

et al. 2013

Engineering Applications of Computational Fluid Mechanics

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In this paper, a CFD study of two types of axial-flow automotive cooling fans was conducted to investigate the effects of upstream and downstream blockage on aerodynamic performance of each fan. The realizable k-turbulence model was applied and simulations were performed to represent an automotive engine bay and quantify performance changes as a function of blockage distance. Modeling was performed for two fan designs: one optimized for a low flow rate, high-pressure operation; and a second optimized for high flow rate, low-pressure operation. The results show that the pressure loss caused by engine blockage increases at higher vehicle speed, and decreasing blockage distance. A new relation between blockage to fan proximity and fan performance was established. It is determined that the pressure change follows a quadratic type dependence, but the coefficients may vary, depending on fan type. The fan efficiency can be improved by taking advantage of larger blockage distances at higher speeds of the vehicle. The blockage condition causes an increase in the reverse flow near the fan interface, and a dramatic increase in radial flow.

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Section: Introductionmentioning

confidence: 99%

Computational Aerodynamic Study of Automotive Cooling Fan in Blocked Conditions

Baniasadi¹,

Aydın²,

Dinçer³

et al. 2013

Engineering Applications of Computational Fluid Mechanics

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“…This code shows good correlation between experimental and numerical results for both external aerodynamics and cooling airflow [8]. The code is based on the principle of performing very large eddy simulations (VLES) that directly simulate resolvable flow scales while modeling unresolved scales.…”

Section: Umerical Resultsmentioning

confidence: 99%

“…Numerical simulations give more and more accurate results for both external aerodynamics and cooling airflow predictions [7,8]. Moreover, numerical results give an easy access to flow rates, velocity distributions and recirculation zones that are difficult to obtain with experimental investigations.…”

Section: Introductionmentioning

confidence: 99%

“…Investigating the cooling airflow is then a way to reduce the total drag. Moreover, the amount of flow through the engine compartment is determined by the front end vehicle geometry, the cooling system package and the engine compartment geometry, including the inlet and outlet sections [6][7][8]. The internal flow is complex and divided into several circuits [9].…”

Section: Introductionmentioning

confidence: 99%

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Flow in the engine compartment: analysis and optimisation

D’Hondt

Gilliéron

Devinant

2011

IJAD

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In the current sustainable development context, car manufacturers have to keep doing efforts to reduce the aerodynamic drag of automotive vehicle, and consequently their CO 2 and greenhouse gas emissions. The cooling airflow through the engine compartment of vehicles contributes from 5% to 10% to the total aerodynamic drag. By means of a simplified car geometry, equipped with an engine compartment, flow in the engine compartment is analyzed by three complementary approaches: an experimental approach, a numerical approach and an analytical approach. The experimental approach is mainly used to measure drag values and to explain the drag variations induced by modifications of the outlet location. The purpose of the numerical simulations is to evaluate the flow rates through the engine compartment and particularly through the heat exchangers. Finally, the analytical approach establishes a model to connect the aerodynamic drag with the cooling flow rate. Configurations favorable to low cooling drag values and high cooling flow rates are identified. They correspond to vehicles with an engine compartment outlet located at the rear end.

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“…PowerFLOW is a Lattice Boltzmann equation based flow solver. The underlying equations and turbulence modeling have been reviewed in previous publications [7] [8].…”

Section: Simulation Methodologymentioning

confidence: 99%

Validation and Design of Heavy Vehicle Cooling System with Waste Heat Recovery Condenser

Dickson

Ellis²,

Rousseau

et al. 2014

SAE Int. J. Commer. Veh.

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The idea of recovering waste heat, and using it for some useful purpose, is certainly not new. Within vehicular applications, most people are aware, perhaps unknowingly, of some form of waste heat recovery technology. The simplest of these forms is most-likely the utilization of engine waste heat for the purpose of cabin heating. In this instance, the waste heat engine coolant stream simply transfers heat to the cabin, instead of outside air, in order to provide the desired level of passenger comfort. Another common, and more complex, form of waste heat recovery is the use of a turbocharger. In this instance, some of the waste heat from the exhaust stream is used to drive a compressor, via an exhaust-driven turbine, for the purpose of increasing the aerobic potential of an internal combustion engine, which in turn increases its power output. This evolution of waste heat recovery technology from simple thermal waste heat utilization, to thermal mechanical waste heat utilization with the automotive industry is an evolutionary path not unique to this industry, and has subsequently taken place in other areas outside of on-road applications. Of ABSTRACTFuel efficiency for tractor/trailer combinations continues to be a key area of focus for manufacturers and suppliers in the commercial vehicle industry. Improved fuel economy of vehicles in transit can be achieved through reductions in aerodynamic drag, tire rolling resistance, and driveline losses. Fuel economy can also be increased by improving the efficiency of the thermal to mechanical energy conversion of the engine. One specific approach to improving the thermal efficiency of the engine is to implement a waste heat recovery (WHR) system that captures engine exhaust heat and converts this heat into useful mechanical power through use of a power fluid turbine expander.Several heat exchangers are required for this Rankine-based WHR system to collect and reject the waste heat before and after the turbine expander. The WHR condenser, which is the heat rejection component of this system, can be an additional part of the front-end cooling module. Packaging this WHR condenser as part of the front-end cooling module can be an engineering challenge given the tight underhood environment where the current powertrain cooling components are already near system-capable thermal limits. This paper shows how Lattice Boltzmann Method based simulations using highly-detailed vehicle geometry were utilized in the development of the heat exchanger architecture used to meet peak cooling needs as well as provide sufficient cooling airflow to the WHR condenser under all operating conditions. Heat exchanger results from the simulations are shown to compare well to cooling test measurements in a fully-climatic vehicular wind tunnel.

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Simulation of Cooling Airflow under Different Driving Conditions

Cited by 32 publications

References 17 publications

Computational Aerodynamic Study of Automotive Cooling Fan in Blocked Conditions

Computational Aerodynamic Study of Automotive Cooling Fan in Blocked Conditions

Flow in the engine compartment: analysis and optimisation

Validation and Design of Heavy Vehicle Cooling System with Waste Heat Recovery Condenser

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