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Water Removal From Vehicles Air Intake
Published May 18, 2003 by Institution of Mechanical Engineers in United Kingdom
The heating ventilation and air conditioning system, HVAC, of a vehicle directly affects the provision of thermal comfort within the vehicle passenger compartment. The first element of a typical HVAC system, namely the cowl box is a critical first barrier in removing water from the air stream. This is achieved by ensuring standing water within the cowl is quickly drained and that water rain droplets or water flows from the windshield and body are separated from the air stream, hence minimizing the effect on the total system volumetric flow rate. An experimental study is conducted to examine the effect of plane baffles on the airflow filed within a rectangular duct. A set of plane baffle plates is placed within the cowl duct. Flow visualization methods are used to acquire the airflow properties within the rectangular duct. The experimental observations and measurements are compared to results of numerical simulation employing the finite volume method and assuming a fully developed flow. Good agreement is found between measured and computed velocity profiles.