In aerodynamics, the airflow velocity on the pressure side (windward side) of a blade is relatively low, while the pressure is high. The geometric profile of the pressure side is a critical determinant of aerodynamic performance; modern designs often employ parametric methods-such as Bézier curves-to precisely control the shape by defining characteristic points, thereby meeting specific mechanical performance requirements regarding pressure drop, torque, and efficiency.
In rotating machinery (such as turbines), the flow and cooling characteristics on the pressure side are significantly influenced by rotational effects. Regarding film cooling on the pressure side, the cooling film trajectory deflects toward a larger radius; the degree of this deflection diminishes as the blowing ratio increases but intensifies as the rotation number rises. Concurrently, the film coverage area and cooling efficiency increase with the blowing ratio but decrease as the rotation number increases. To optimize performance, structural modifications can be implemented on the pressure side; for instance, installing spoilers of specific dimensions along the spanwise direction of a wind turbine blade can effectively reduce local fluid velocity and increase pressure, thereby enhancing the blade's aerodynamic performance and power generation efficiency.
