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A kind of spoiler and spoiler for autonomous disturbance triggering turbulent transition

A technology of spoiler and spoiler, which is applied in the direction of affecting the air flow flowing through the surface of the aircraft, hydrodynamic characteristics/hydrostatic characteristics, transportation and packaging, etc., to achieve the effect of easy implementation and simple structure

Active Publication Date: 2020-02-14
CHINA ACAD OF LAUNCH VEHICLE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the induced flow transition from laminar to turbulent often creates additional resistance

Method used

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  • A kind of spoiler and spoiler for autonomous disturbance triggering turbulent transition
  • A kind of spoiler and spoiler for autonomous disturbance triggering turbulent transition
  • A kind of spoiler and spoiler for autonomous disturbance triggering turbulent transition

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Embodiment Construction

[0076] In order to reduce the resistance of the vehicle body, the turbulent transition is activated upstream of the bottom to increase the flow energy of the boundary layer and eliminate the bottom shedding vortex, thereby reducing the bottom resistance. Moreover, it is necessary to effectively trigger the turbulent flow transition under the premise of little additional resistance.

[0077] It is thus proposed to install a self-popping spoiler upstream of the bottom. Using the pre-set spring compression force, the spoiler can be automatically ejected from the groove at low flow speeds. The spoiler disturbs the flow, triggering a change in the flow from laminar to turbulent. In order to achieve greater disturbance with a small additional resistance, the spoiler is designed as a high-order smooth curve, which guides the flow from the axial flow to the circumferential flow, generates circumferential disturbance, and triggers the transition more effectively. At the same time, dov...

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Abstract

The invention relates to a turbulence transition triggered by autonomous disturbance and a spoiler. The turbulence is installed in a plurality of grooves in the circumferential direction of the navigation body. In the groove, there is no protrusion on the surface of the vehicle body, so it will not cause additional flow resistance. The invention sets a rated critical Reynolds number. When the flow velocity decreases and the density is low, the flow is laminar flow. At this time, the pressure of the flow on the spoiler decreases, and the force of the compression spring can eject the spoiler. . After the spoiler pops up, it will disturb the flow at the bottom of the flow, triggering laminar flow into turbulent flow. By setting the elastic force of the spring, the present invention can automatically turn on the disturbance device when the disturbance triggers the turbulent flow transition, and automatically close it when it is not needed, so as to realize the autonomous control of the turbulent flow transition.

Description

technical field [0001] The invention relates to a spoiler and a spoiler for autonomous disturbance triggering turbulent transition, and belongs to the technical field of navigation body resistance control. Background technique [0002] When the vehicle navigates in the air and underwater, it must overcome resistance. The resistance of the flying body is mainly composed of the friction resistance of the object surface and the pressure difference resistance. For a vehicle sailing at a low speed, the pressure differential resistance occupies the main part, and the main part of the pressure differential resistance is generated by the shedding vortex flow at the bottom of the vehicle. The shedding vortex not only causes the bottom pressure to fail to return to the ambient pressure, but also brings a large pressure difference resistance, but also brings unnecessary vibration force to the vehicle due to the periodic large fluctuation of the bottom pressure. [0003] To reduce the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B1/32B63B1/36
CPCB63B1/32B63B1/36B63B1/322B64C9/34B64C21/10B64C23/06B64C2230/08Y02T50/10Y02T70/10B64C5/10G05B17/02
Inventor 陆宏志赵静刘丽丽惠俊鹏刘敏华赵民康磊晶赵月李一帆
Owner CHINA ACAD OF LAUNCH VEHICLE TECH