Research On Infrared Radiation Characteristics And Imaging Simulation Of Transport Aircraft

Among the military powers in the world today,large strategic transport planes are one of the most important aircraft types in military aircraft.It plays a decisive role in large-scale military operations.The quantity,carrying capacity,and technical level of large-scale strategic transport aircraft have become the ability to measure whether a country has a "strategic air force." From the offensive and defensive point of view,reducing the infrared radiation intensity of the transport aircraft itself to reduce the probability of detection and early warning of the transport aircraft in future air battles are the key factors in winning the war.Due to the intense friction between the skin and the air when the transport aircraft is flying in the air,the temperature of the skin is significantly higher than the atmospheric temperature,so a strong infrared radiation intensity difference is generated.The difference in infrared radiation intensity will reveal important information such as the position and direction of the transport aircraft,which will seriously reduce the stealth performance and survivability of the transport aircraft.Therefore,it is of great significance to develop the infrared radiation characteristics and simulation of transport aircraft.This thesis takes the C-17 strategic transporter as a model for solid modeling,and simulates the flow field according to the typical flight conditions to obtain the transporter skin temperature distribution,and the maximum error between the simulation results and the empirical formula is 0.64%.In this thesis,a solar radiation calculation model is established and combined with the solar radiation area scale factor calculation method,the distribution of solar radiation on aircraft skin at six different times is calculated.The maximum value of solar radiation that the skin can receive is 1065W/m~2,which can cause a temperature rise of 35.3°C.This area is mainly the vertical solar radiation area.Take transport aircraft as the research object,fully consider the attenuation of infrared radiation energy in the atmosphere,and use MODTRAN software to calculate the atmospheric transmittance under different atmospheric modes,aerosols,detection height and detection angle.According to point source sight distance calculation model,the infrared detection distance calculation model of transporter is established.The calculation results show that weather conditions such as cloud and rain have the greatest impact on the calculation results.The distribution of infrared radiation intensity along different lines of sight in different conditions of the transporter was analyzed,and the infrared simulation images of the transporter under various working conditions wer e simulated in combination with central projection,coordinate conversion,surface source blocking and blanking judgment,atmospheric transmittance and other factors.The analysis results show that the detection distance has a great influence on the infrare d imaging simulation results.The greater the detection distance,the smaller the infrared radiation intensity.Under the same detection orientation,the greater the flight speed of the conveyor,the greater the intensity of the infrared radiation received by the detector,thus increasing The possibility of being detected.