Abstract
In this study, a method to solve the passing air flow through under-hood by finite volume method is discussed. The flow field existing around a car or passing through it is going to play an important role from different viewpoints. Lateral flow has an important role in fuel consumption, lower emissions, directional sustainability and the wind sound. On the other hand, the internal flow is important from the viewpoint of the good performance of heating systems, air conditioning systems for reducing the temperature of components and thus increasing the life and better performance of components and also engine cooling systems. The study of internal flow is the subject under consideration in the present study. The ultimate goal of this study is to improve the performance of the engine cooling system and decrease the temperature of the components in the space under the hood. In order to achieve the demands, a commercial CFD code for the simulation of air flow under the hood of a passenger car is utilized and finally the method and results of this study are shown.
Highlights
As we know, the engine in limited space under the hood acts as a heat source which increases the temperature under the hood due to the heat flux
The amount of volumetric air flow rate passing through the heat converters was measured: As it is clear from the Table 1, there is a strong correlation between the data leading to an increase in the confidence level to precede a virtual simulation of car
In 2500 rpm fan speed, low temperatures were obtained from under-hood space
Summary
The engine in limited space under the hood acts as a heat source which increases the temperature under the hood due to the heat flux In this case, the low velocity of air in the space under the hood is considered as the main feature of this issue that stipulates further analysis. Through this analysis, we are able to determine the thermal conditions of areas having critical conditions. The airflow through the front end heat exchangers is critical for the cooling performance of a vehicle. Since many contradicting factors are defining the front end design, a clear understanding of the airflow behavior and its influence on the cooling performance is required. Many have resorted to Computational Fluid Dynamics (CFD) to get this understanding (Lawrence, 2001)
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