Research On Transient Temperature Measurement Technology In The Artillery Chamber

During the shooting process of the artillery,the burning of gunpowder converts chemical energy into heat energy,which is then converted into kinetic energy to promote the movement of the projectile.Gunpowder in the instantaneous combustion process will produce a large number of high temperature gas.Although the high-temperature gas lasts for a very short time,the high heat transfer rate will cause the gun barrel to heat up rapidly,causing the inner metal in the chamber to be heated to soften or even melt.A thin layer of melting is formed and peeled off under the erosion of the gunpowder gas,which directly affects the life of the artillery barrel.Therefore,the ability to accurately measure the transient temperature in the chamber is of great significance for understanding the nature of the shooting process,improving and developing artillery technology.The purpose of this research is to test the temperature in the chamber,and choose to use a fast-response thermocouple to measure the gunpowder gas temperature.First,the internal ballistic model of the artillery was constructed and the relevant parameters were solved.On this basis,the internal environment in the test process is analyzed,and the overall design plan of the test system is proposed based on the above theoretical analysis,and the functional requirements and performance indicators of the system are determined.The hardware and software of the test system are introduced in detail.Taking into account the harsh environment of high temperature,high pressure and high impact in the gun bore,the test system selects FRAM suitable for the test environment in the bore on the basis of dynamic storage test technology.The main control chip makes the test system have good stability and flexibility.After the completion of the system debugging,related simulation tests were carried out on the test system to verify the basic functions realized by the test system.Because the test system belongs to the category of transient temperature test,the static calibration and dynamic calibration of the thermocouple sensor are studied,and a measuring method of the thermocouple time constant is designed.Then,with this test system as a starting point,the effective number of bits of the built-in AD module was tested,and the oversampling technique was demonstrated to improve the sampling accuracy.Finally,the error synthesis of the temperature measurement system is briefly analyzed.The temperature test system in the artillery chamber studied in this paper has the characteristics of fast response,low power consumption,and high reliability.It satisfies the basic requirements of the temperature test in the artillery chamber,and can provide a certain reference basis for the improvement and optimization of the artillery firing technology.