Combined jet-flow control device for helicopter rotor blade and control method of combined jet-flow control device

Abstract

The invention discloses a combined jet-flow control device for a helicopter rotor blade and a control method of the combined jet-flow control device. The combined jet-flow control device comprises a plurality of blades with a geometric shape of NACA0012-CFJ airfoil shape, each blade is provided with a combined jet flow device, the combined jet flow devices are continuously distributed along the unfolding direction of the blade, each combined jet flow device comprises a high pressure air chamber and a low pressure air chamber, the high pressure air chamber is communicated with an air blowing opening at the front edge, the low pressure air chamber is communicated with an air suction opening at the rear edge, and the high pressure air chamber and the low pressure air chamber are communicated with an air pump device inside a helicopter by virtue of an airflow pipeline. A novel-concept initiative flow control technique of combined jet flow is innovatively adopted to suppress the dynamic stalling of the rotor blade, the air is blown from the opening adjacent to the front edge of the upper surface of the airfoil to the rear edge, the air is sucked through the opening adjacent to the rear edge, and the air suction volume and the air blowing volume are ensured to be the same, so that the recycling of the air is realized, and the control method is flexible.

Description

technical field [0001] The invention relates to the technical field of active flow control, in particular to a combined jet flow control device for helicopter rotor blades and a control method thereof. Background technique [0002] Due to its unique flight characteristics, helicopters can take off and land vertically, do not need an airport runway, can hover in the air, and have the ability to fly in any direction, making them irreplaceable by general fixed-wing aircraft in some aspects of military and civilian use. important position. In terms of military use, it has been widely used in ground attack, weapon delivery, logistics support, battlefield rescue, reconnaissance and patrol, command and control, communication, anti-submarine mine clearance, electronic countermeasures, etc. In civil use, it is used in short-distance transportation, medical rescue, disaster relief, emergency rescue, hoisting equipment, geological exploration, forest protection and fire fighting, aeri...

AI Technical Summary

Problems solved by technology

The vortex generator is a passive flow control method, which has a certain effect on the separation control of the design point, but has a weak effect on the non-design point working conditions, and will bring the adverse effect of increasing the resistance

Synthetic jet delays the separation of airflow through periodic blowing and suction of openings, which is more effective for certain working conditions, but the control effect for dynamic stall with complex working conditions is still not ideal

The trailing edge winglet method is similar to the flap device of the wing. Through periodic deflection, the dynamic stall can be effectively controlled, but it needs to be equipped with an actuating mechanism, resulting in a complex structure and a significant increase in weight

Images