Low-Reynolds-number airfoil section with multi-seam synergetic jet flow control and control method

Abstract

The invention provides a low-Reynolds-number airfoil section with multi-seam synergetic jet flow control and a control method. The low-Reynolds-number airfoil section with multi-seam synergetic jet flow control comprises a jet exhaust (2) arranged on the front edge of the upper surface of the airfoil section (1), wherein a suction area (3) formed by a plurality of orderly arranged suction tiny holes (10) is arranged on the rear edge of the upper surface of the airfoil section (1); the jet exhaust (2) is communicated with the suction area (3) through an airflow pipeline (5) in the airfoil section (1) to form a suction loop; an air pump (4) for driving the synchronous operation of suction and injection is installed in the airflow pipeline (5); the jet exhaust (2) and the suction tiny holes (10) are vertical to the upper surface of the airfoil section (1). The suction control technology is applied to the low-Reynolds-number airfoil section, the lifting-resistance characteristic of the airfoil section is improved and the aerodynamic characteristic of a high-altitude vehicle is perfected by controlling the laminar separation of the low-Reynolds-number airfoil section; the airfoil section has the advantages of low power consumption, so that the aerodynamic efficiency of the high-altitude vehicle is improved.

Description

technical field [0001] The invention belongs to the technical field of fluid control, and in particular relates to a low Reynolds number airfoil with multi-slot cooperative jet control and a control method. Background technique [0002] High-altitude aircraft such as high-altitude drones and stratospheric airships work in areas above 20km above sea level. Due to the high flying altitude and the thin atmosphere (the air density is 1 / 14 of that on the ground), this type of high-altitude aircraft has the characteristics of low cruising Reynolds number. Under the condition of low Reynolds number, laminar flow separation is easy to occur under the small angle of attack of ordinary airfoil. If the turbulent flow can overcome the influence of the reverse pressure gradient, flow reattachment will occur. The region between the separation point and the reattachment point is called the separation bubble. The existence of separation bubbles will have a serious impact on the low Reynol...

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