THE RELATIONSHIP OF BUS VENTILATION WITH ITS FRONTAL RESISTANCE COEFFICIENT

Abstract

The article presents the results of a study of the influence of natural and mechanical ventilation of the cabin and the driver's cabin on the air flow of the bus. Experimental studies were carried out in wind tunnels. Based on the measurements, the distribution of air velocities in the boundary layer was determined. In addition, the influence of natural ventilation of the interior space on the thickness of the air boundary layer was analyzed. The results are presented by means of a distribution diagram and analytical dependences. The purpose of this study is to determine both the thickness of the boundary layer when air passes through the car model and the drag coefficient. Experimental studies of the flow of a bus model in a wind tunnel have been carried out. It is determined that when the speed of air supply is increased, the ventilation supply devices should be placed in the rear part of the bus, and the exhaust devices should be placed in the front part of the bus. This measure improves body flow while the bus is moving. As a result, the coefficient of frontal resistance decreases and its economic indicator of fuel consumption improve.