Liquid-curtain type heat dissipation structure for lidar onboard unmanned aerial vehicle

A liquid-curtain type heat dissipation structure for LiDAR onboard unmanned aerial vehicle, wherein a cooling liquid-curtain is formed in a heat dissipation interface such that heat dissipation is achieved by phase change of the cooling liquid in an operation environment;

• the structure comprises a micro liquid storage tank and a heat dissipation panel;
• a liquid inlet, a liquid outlet, and a vent hole are provided on the micro liquid storage tank, and a heat dissipation interface and a drainage channel are provided on the heat dissipation pane;
• wherein the micro liquid storage tank which is configured to store the cooling liquid required is integrally formed on a box lid or is externally disposed, and a volume V in the tank satisfies Formula (1) to ensure working time,
• V
• ≥
• a
• ⁢
• T
• 1.62
• ⁢
• P
• -
• 0
• .
• 5
• ⁢
• H
• -
• 1.1
• ⁢
• tS
• (
• 1
• )
• wherein a is an environment influence coefficient, T is a temperature (° C.), P is an atmospheric pressure (Pa), H is ambient humidity (%), t is working time (h), and S is an area of a heat dissipation panel (cm2);
• wherein a caliber of the vent hole of the liquid storage tank is less than or equal to ¼of a total caliber of the liquid outlet, so as to adjust a liquid output amount;
• a diameter of a single liquid outlet is smaller than 1 mm, thus preventing a large amount of air from entering a box through the liquid outlet to reduce an adjustment effect of the vent hole;
• and a plurality of small-caliber liquid outlets are set to meet a flow demand;
• and
• wherein the heat dissipation panel is integrally formed on the box lid to ensure waterproof performance of a box body;
• a heat dissipation interface is provided on the heat dissipation panel, and a top of the heat dissipation interface is connected to the liquid outlet, and the heat dissipation interface is arranged in rows on the heat dissipation panel;
• meanwhile, drainage channels are provided at the liquid outlet and all layers of the heat dissipation interface, and a contact angle θ between a surface material/paint of the heat dissipation interface and the cooling liquid satisfies Formula (2) to ensure that the cooling liquid is attached to the heat dissipation interface and does not slide down;
• θ
• ≤
• 90
• ⁢
• °
• (
• 2
• )
• wherein
• θ
• =
• cos
• -
• 1
• ⁢
• {
• 0.55
• ln
• ⁢
• γ
• s
• -
• 1.1
• ln
• ⁢
• γ
• l
• -
• 0.5
• Ra
• 2
• }
• γs is solid surface energy (mN/m), γl is liquid surface energy (mN/m), and Ra is surface roughness of the heat dissipation panel.