Experimental technique for determining the burning rate of solid rocket fuel with electrically conductive reaction products in a constant pressure device

Abstract

One of the main tasks of conducting experimental research is the creation of a scientific and informational database of the characteristics of the burning process of solid rocket fuels (SRP), which are being developed for the design and development of power plants and technological processes. The main combustion characteristics of such solid fuels in relation to power plants are the dependence of the linear combustion speed on pressure, the determination of the degree index in the combustion speed law, a unit impulse equal to the increase in the amount of traction realized during the combustion of a unit mass of fuel, as well as the composition and characteristics of condensed products. Today, theoretical models do not allow calculating the burning rate with the necessary accuracy due to the lack of a detailed understanding of the mechanisms of physical and chemical processes occurring in the reaction zone. Experimental methods make it relatively easy to obtain the necessary data in a stationary mode, but it is much more difficult to carry out measurements in non-stationary conditions. Experimental data on the dependence of the steady-state burning rate on the pressure and initial temperature of the fuel are used to identify the non-stationary burning rate in the development of indirect methods for measuring the non-stationary burning rate of TRP (inverse internal ballistics methods) [1]. The purpose of the research is to develop an experimental method for determining the burning rate of solid rocket fuel without errors due to the excessive formation of electrically conductive reaction products in a constant pressure device. To study the regularities of normal combustion of solid fuels, a constant pressure bomb (CPB) is used [2]. An experimental technique for measuring the burning rate of solid fuel samples in a constant pressure bomb was developed in order to determine the burning rate law of the combustion products of solid fuel compositions. In the process of research, a technical solution was developed and implemented, which made it possible to reduce the amount of measurement error due to the excessive formation of electrically conductive reaction products in the constant pressure device. The experimental technique was developed on samples of solid fuel compositions based on potassium nitrate and can be used to determine the burning rate of solid high-energy materials with excess formation of electrically conductive reaction products in experimental devices.