Abstract
Nonuniform distribution of velocity of cooling air over the front surface of a radiator increases its drag. The paper analyzes the factors affecting the increase of aerodynamic drag under the influence of unsteady air flow. The degree of drag change depends on aerodynamic properties of radiator core, namely, the curvature of the graph of aerodynamic characteristics of a radiator and nonuniform air velocity field over the front of a radiator. In actual use, increase of drag of a radiator can be more than 20%.
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