Temperature Sensitivity Coefficients of RDX‐Based Propellants and Their Mixed Charges

Abstract

Low temperature sensitivity coefficients of gun propellants are of great significance for improving the stability of weapon performances. In this work, RDX-NC-NG-DEGDN propellants (R-MNEGP) were prepared to reduce the temperature sensitivity coefficient of mixed charges. The temperature sensitivity coefficients of R-MNEGP, NC-NG-DEGDN propellants (MNEGP) and their mixed charges were studied by closed vessel tests, scanning electron microscope (SEM), and ballistic firing experiments. The results show that the increased burning surface of R-MNEGP compensates the decrease in the burning rate of the propellant when the initial temperature is decreased compared with MNEGP. The temperature sensitivity coefficient of R-MNEGP is lower than that of MNEGP, and the temperature sensitivity coefficients of the mixed charges (R-MNEGP and MNEGP) are between these two temperature sensitivity coefficients in the range of À 40°C-20°C and 20°C-50°C. Compared with MNEGP, the velocity temperature sensitivity coefficients of the mixed charges with 6 wt % and 10 wt % R-MNEGP decreased by 34.86 % and 70.67 %, and the pressure temperature sensitivity coefficients of these decreased by 42.99 % and 100.90 % with increasing temperature from À 40°C to 15°C. And the velocity temperature sensitivity coefficients had no significant change, and the pressure temperature sensitivity coefficients decreased by 2.58 % and 77.98 % in the range of 15°C-50°C. This study offers an attractive strategy for tuning the temperature sensitivity coefficient by mixing charges of R-MNEGP and MNEGP with different temperature sensitivity coefficients.

Study on the forming quality of double-base gun propellants based on extrusion 3D printing technology

“…The complex geometry of gun propellant is one of the important methods to control its energy release process [1]. Due to the limitations of traditional gun propellant preparation technology, the geometry of gun propellant is relatively simple at present, such as sheet, column, tube and multiperforation [2]. 3D printing technology is a digital rapid prototyping technology stacked layer by layer in a variety of ways, which makes it possible to prepare gun propellants with complex geometry [3,4].…”

Integration of Complex Geometry Gun Propellant Form Function Calculation and Geometry Optimization

“…In addition, the form function is also one of the conditions to simulate the interior ballistic performance of a weapon [2]. Currently, the simulation of the interior ballistic performance of weapons with mixed gun propellant charges is performed by associating the form function of each gun propellant, which makes it difficult to analyze the combustion process of mixed gun propellants in the chamber by interior ballistic performance parameters [3,4]. Additive manufacturing (AM) technology can rapidly produce complex geometric products that are difficult to be prepared by the conventional process according to the computer-aided design (CAD) model [5][6][7].…”