A jet structure for drag reduction of a coaxial rigid rotor hub and its application method
A rotor hub and rigidity technology, which is applied in the jet structure field of coaxial rigid rotor hub drag reduction, can solve the problems such as the difficulty of further reducing the hub resistance, so as to avoid premature separation, reduce the hub resistance, and flow Control the best effect
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Embodiment 1
[0045] Such as Figure 1 to Figure 4 As shown, a jet structure for coaxial rigid rotor hub drag reduction, including the upper hub fairing 1, the lower hub fairing 3, the upper hub fairing 1 and the lower hub The intermediate shaft fairing 2 between the fairings 3 is provided with a jet hole 5 , and the jet hole 5 extends from the inner cavity of the intermediate shaft fairing 2 to the outside of the intermediate shaft fairing 2 .
[0046] Due to the setting of the jet hole 5, air is blown from the inner cavity of the countershaft fairing 2 to the outside of the countershaft fairing 2 during operation, and the jet hole 5 has the effect of reducing the resistance of the propeller hub.
[0047] As a preferred technical solution, the extension direction of the jet hole 5 is vertically downward or the included angle range with the vertical downward direction is (0, 80°].
[0048] The setting of the extending direction of the jet holes 5 further reduces the resistance of the prope...
Embodiment 2
[0060] Such as Figure 1 to Figure 4 As shown, as a further optimization of Embodiment 1, this embodiment includes all the technical features of Embodiment 1. In addition, this embodiment also includes the following technical features:
[0061] A method for using a jet structure for drag reduction of a coaxial rigid rotor hub includes the following steps:
[0062] S1, blow or suck air from the inner cavity of the intermediate shaft fairing 2 to the outside of the intermediate shaft fairing 2;
[0063] S2, comparing the drag reduction effects of the jet structure with different extending directions of the jet holes 5 .
[0064] Preferably, in step S1, air is blown from the front edge to the rear edge of the intermediate shaft finishing cover 2, and the effect is better.
[0065] As a preferred technical solution, it also includes the following steps:
[0066] S3, setting different blowing speeds, and comparing the drag reduction effects of the jet structures with different b...
Embodiment 3
[0070] Such as Figure 1 to Figure 4 As shown, this embodiment includes all the technical features of Embodiment 1 and Embodiment 2. On the basis of Embodiment 1 and Embodiment 2, this embodiment provides a more detailed implementation mode.
[0071] The jet holes 5 are placed on both sides of the rear edge of the fairing of the center shaft of the propeller hub, and the slotting method is to vertically set the vertical jet holes 5 along the model from top to bottom, and the aspect ratio of the jet holes 5 is 95~100. The blowing direction of the jet control method is to blow air from the inside of the model to the outside along the jet hole, and the jet angle θ is defined as the horizontal angle with the incoming flow direction. In this embodiment, the incoming flow direction is from the vortex generator to the jet hole, such as Figure 4 As shown, among them, U ∞ is the incoming flow velocity, U jet is the blowing speed, U ∞ with U jet on the same plane.
[0072] It shou...
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