Propellant Combustion Performance And Test Methods Research

This work is devoted to test the burning rate pressure exponent under different pressures. In this study, combining with the traditional closed bomb test, we discussed the influence of the different test conditions on the combustion properties of propellant, and we established a new method of closed bomb test to characterize the buring rate and the burning rate exponent mechanism more accurately. The experiment, with the TEGDN propellant as the subject, studied the burning rate pressure exponent under different test conditions, such as the grain size, web size and charge density of propellant. The characteristics of p-t curve was obtained by closed bomb test. Through mathematical conversion, variety of the burning rate pressure exponent will give expression to the propellant's combustion. Based on the results of the test, we summarized the influence of the different test conditions on the combustion properties, and the optimum conditions of the determination were obtained.The burning rate was obtained by traditional closed bomb test, and we did not pay more attention to the factors, such as the change of burning surface, pressure and different type of propellant, which can effect the testing accuracy. Results show that it is the apparent burning rate pressure exponent. It is the macroscopic reflection over whole pressure range, and was not actually reflect the combustion property of propellant. We researched and improved the closed bomb test theoretically. We used VB to program, and established a new method to the burning rate pressure exponent. The results show that the method basically eliminate those factors, and simplify the requirements of test condition. The performance is of good reliability and high fitting accuracy.