Simulation to thermal characteristic of laser fuze on supersonic rocket

Laser fuze is the most important part on supersonic rocket with the obvious advantages of the capability of anti -jamming, the high precision measurement, the narrow light beam, and the high compatible capability with other munitions, but it must work in harsh environment, such as high temperature, high shock etc. In order to protect laser fuze , especially for its optical window, research on thermal characteristic of laser fuze is very important. Firstly, according to the demand of the system, the structure of laser fuze in supersonic rockets was described, the thermal model was set up, all heat sources of supersonic rockets were analyzed in working condition, and the 16 key points of optimized model for thermal characteristic analysis were set up as well. Based on the principle of caloric balance for rocket , the trajectory model and the relationship between the thermal and trajectory models were set up. The finite element method was adopted to build a model for the supersonic rocket laser fuze and complete thermal characteristic simulation successfully. On the basis of simulation, the surface temperature charts at eight time points, the function curve of rocket speed versus time and fuze surface temperatures were obtained.lt is concluded that the influence of pneumatic caloric on the intensity of optical window should be considered as well as transmission characteristic of optical window.