| Single-mass energy-containing materials are substances that can undergo rapid chemical reactions,of which HATO and DNTF,as new high-energy-density passivation materials,are characterized by high stability and high strength.The ignition reactions of HATO and DNTF are used to investigate the characteristic evolution of temperature fields and combustion waves under different levels of thermal stimuli.The ignition reaction is one of the most important tools to assess the safety and intensity of the reaction,providing a theoretical basis and technical support for the experimental study of the temperature field and combustion wave during the ignition of single-mass energy-containing materials.In this paper,the schlieren quantitative measurement technology is used to measure the temperature field and combustion wave during the ignition reaction of elemental energetic materials HATO and DNTF by using calibrated Schlieren method and Abel inverse transformation.Firstly,the basic principle of quantitative schlieren temperature measurement is studied,and the temperature inversion calculation process of calibration schlieren method and the calculation formula of wave velocity of combustion waves are derived;the calculation of temperature field and wave velocity of combustion waves during ignition of elemental energetic materials is realized by programming.On this basis,the transmission high-speed schlieren measurement system is designed and constructed,and each module of the experimental system is designed and optimized.In order to improve the sensitivity of the system,the system light source and optical path were optimized,and the lens,knife edge and other devices were adjusted slightly to obtain a high signal-to-noise ratio schlieren image.Secondly,in order to verify the accuracy and reliability of the constructed Schlieren system and the temperature measurement method,the flame temperature field verification experiment of alcohol lamp was carried out.Based on the schlieren image of the flame of the alcohol lamp and the temperature inversion calculation method of the calibrated schlieren method,the temperature field distribution of the flame of the alcohol lamp was obtained.By comparing the experimental results of Schlieren method with the measured values of thermocouple,the results show that the relative error of the two temperature is less than 5%,which verifies the feasibility of the schlieren measurement system and the temperature measurement method,and lays a foundation for the measurement of temperature field during the ignition of energetic materials.Finally,the ignition experiments of single-mass energy-containing materials HATO and DNTF were carried out,and the corresponding temperature field and combustion wave evolution law were obtained.According to the material characteristics of HATO and DNTF,the ignition platform suitable for different ignition modes was designed and optimized,and the feasibility study of different ignition modes of HATO and DNTF was carried out.The experiment showed that DNTF could only be ignited by the way of resistance wire ignition,while HATO could be ignited by semiconductor laser and resistance wire ignition at the same time.A series of sequence schlieren images of the ignition process of HATO and DNTF were obtained by using the experimental conditions of different levels of thermal stimulation.The experimental results show that the maximum temperature values of HATO and DNTF are close to 1200 K,and the average wave velocity of HATO is approximately 0.4m/s～1.0m/s,while the average wave velocity of DNTF is approximately 0.7m/s～5.0m/s.The results show that the temperature of HATO is roughly 900～1200K,the maximum combustion temperature is about 1200 K,and the average velocity of combustion wave is about 2.5m/s～5.0m/s.Compared with different ignition modes,the reaction of HATO is faster,the temperature rises faster and the combustion wave velocity is larger in the semiconductor laser ignition mode. |
PDF Full Text Request