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Double-lip distortion resistance air inlet duct structure suitable for crosswind working condition

An anti-distortion, air inlet technology, which is applied to the combustion of the air inlet of the power unit, the arrangement/installation of the power unit, aircraft parts, etc., can solve the problems of lack of practical value, energy loss, etc., and achieve stable air flow and smooth air flow. Effect of Distortion Strength Reduction

Active Publication Date: 2017-09-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, such solutions often bring unacceptable extra weight and even extra energy loss, and ultimately lack practical value

Method used

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  • Double-lip distortion resistance air inlet duct structure suitable for crosswind working condition
  • Double-lip distortion resistance air inlet duct structure suitable for crosswind working condition
  • Double-lip distortion resistance air inlet duct structure suitable for crosswind working condition

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Embodiment Construction

[0026] 1. See Figure 1-Figure 2 , the present invention is aimed at the power system of the existing vertical take-off and landing aircraft, which is prone to lip airflow separation phenomenon in the crosswind condition and the gust condition, resulting in the performance degradation of the aircraft or even loss of control, while the existing improvement measures are less achievable, and propose The double-lip anti-distortion inlet is suitable for cross-wind conditions. When the traditional inlet encounters cross-wind, flow separation is easily generated on the windward side of the lip, resulting in flow field distortion, such as figure 1 shown. The present invention obviously suppresses this separation phenomenon, the air flow is stable, and the air flow distortion intensity is obviously reduced, as seen figure 2 shown.

[0027] 2. See Figure 3-Figure 7 , the double-lip anti-distortion air inlet structure of the present invention is suitable for cross-wind conditions, a...

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Abstract

The invention relates to a double-lip distortion resistance air inlet duct structure suitable for the crosswind working condition. The structure comprises a first-stage lip and a second-stage lip, a flange is designed on the first-stage lip and is responsible for being connected with a duct casing, a lemniscate is adopted for the lip curve, and thus air flows can enter a duct fan at a smallest loss under the crosswind-free working condition. According to the double-lip distortion resistance air inlet duct structure suitable for the crosswind working condition, the air inlet quality of the crosswind-free working condition cannot be lowered firstly, and the excessive extra weight cannot be caused. On the other hand, when a traditional air inlet duct encounters crosswind, flow separation extremely easily occurs on the windward sides of the lips, and thus flow field distortion is caused; and according to the double-lip distortion resistance air inlet duct structure suitable for the crosswind working condition, the separation phenomenon is obviously inhibited, air flow flowing is stable, and the airflow distortion strength is obviously lowered.

Description

technical field [0001] The invention relates to the field of aircraft aerodynamic design, and belongs to air inlet parts, in particular to a double-lip anti-distortion air inlet structure suitable for cross wind conditions, and the structure is used to improve the air intake quality of an engine. Background technique [0002] Vertical take-off and landing aircraft has been better developed this year because of its flexible use and diversified expansion functions. Among them, due to its compact structure and good portability, the ducted fan drone has received extensive attention from researchers in the past ten years, and a large number of ducted fan drone prototypes have emerged, such as HoverEye, Istar, FanTail And Honeywell's T-Hawk etc. However, this type of UAV is prone to flow separation at the leading edge of the lip when flying forward rapidly, encountering gusts of inlet distortion, etc., which eventually leads to problems such as unstable lift and reduced fan perfo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64D33/02
CPCB64D33/02B64D2033/0253
Inventor 王掩刚王海童刘汉儒
Owner NORTHWESTERN POLYTECHNICAL UNIV
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