A Method for Determining the Surface Temperature of Objects in Fog Conditions

A technology of object surface and condition, which is applied in the field of determining the surface temperature of objects under complex weather conditions, and can solve problems such as low calculation efficiency, long-term cost, and inability to calculate the temperature field of objects

Active Publication Date: 2015-09-30
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

The thermal models described in Document 1 and Document 2 cannot calculate the temperature field of objects under foggy weather conditions
[0004] In addition, in the numerical calculation of the temperature distribution of objects under natural environmental conditions, it is usually necessary to consider the influence of the flow field in the environment where the object is located on the temperature field, which involves the coupling calculation of the flow field and the temperature field. Time cost, low computational efficiency

Method used

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  • A Method for Determining the Surface Temperature of Objects in Fog Conditions
  • A Method for Determining the Surface Temperature of Objects in Fog Conditions
  • A Method for Determining the Surface Temperature of Objects in Fog Conditions

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Embodiment Construction

[0072] combine figure 1 , a method for determining the surface temperature of an object under foggy conditions, comprising the steps of:

[0073] Step 1, set up droplet size distribution model and motion model; Described droplet size distribution model and motion model are:

[0074] (a) The droplet size distribution model is

[0075] n(r)=ar 2 exp(-br)

[0076] In the formula, a and b are expressions of water content W and visibility V,

[0077] a=9.781×10 15 V -6 W -5

[0078] b=1.304×10 4 V -1 W -1

[0079] The relationship between water content W and visibility V is

[0080] Radiation fog W=0.00316V -1.54

[0081] Advective fog W=0.0156V -1.43

[0082] In this embodiment, the calculation is performed for radiation fog.

[0083] (b) The droplet motion model is

[0084] When r0 = 2gr 2 (ρ drop -ρ air ) / 9μ air

[0085] When r≥40μm, u 0 = 0.269 2 gr ...

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Abstract

The invention discloses a method for determining object surface temperature under a fog-comprising condition. The method comprises the steps that: a fog-drop size distribution model and a fog-drop motion model are established; a heat transfer model of object surface under the fog-comprising condition is decomposed into a plurality of sub-models; a collision adsorption model of the fog-drops and the surface is established according to the fog-drop size distribution model and the motion model; an evaporation model of liquid film formed on the surface, a surface dew condensation model, a surface convection heat transfer model, a radiative heat transfer model between the surface and the atmosphere background, and a solar radiation model are established; object surface total heat flow is determined according to the object surface sub-models under the fog-comprising condition; and object surface temperature distribution is obtained according to an energy equation. According to the invention, the heat transfer model suitable for the object surface under a fog-comprising condition is established. Under a situation that external flow field is not calculated, the influences of external environments are converted into a plurality of reasonable and accurate boundary conditions. Therefore, object temperature field can be highly efficiently and rapidly calculated.

Description

technical field [0001] The invention belongs to a modeling method of a heat transfer model, in particular to a method for determining the surface temperature of an object under complex weather conditions. Background technique [0002] Nowadays, target detection and recognition is an important way to grasp the situation of the opponent's target, including radar, visible light, sound wave, infrared and so on. Among them, infrared plays an important role in infrared guidance and infrared monitoring. Therefore, mastering the infrared radiation characteristics of targets is of great significance to infrared detection, identification, infrared stealth and anti-stealth. To master the infrared radiation characteristics of the target, the temperature field of the target needs to be calculated first. Document 1 (Xuan Yimin, Han Yuge. Infrared Features of Ground Targets and Background. Beijing: National Defense Industry Press, 2004, 19-100) modeled the thermal model of ground targets...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20G01N25/18
Inventor 韩玉阁宣益民林群青
Owner NANJING UNIV OF SCI & TECH
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