A Calculation of Interior Ballistic of Large-Caliber Naval Gun Based on Two-Phase Flow Dynamics Theory

Modern naval guns pursue the operational characteristics of long range, high velocity and high power, and the mechanical behavior is complex and fast-changing during firing, and the physical quantities that are in the chamber change very drastically with time and space. To develop software for interior ballistic calculation of a certain large-caliber naval gun, this paper established a one-dimensional two-phase flow dynamics model and equations. This paper is grounded on the Mac-Cormack numerical calculation method, and dynamics simulation software was developed using C++ and Qt. This software was then used to simulate the interior ballistic process of a certain large-caliber naval gun under high, normal, and low temperature firing conditions. Through firing tests, the reliability of both the model and software were verified, with relative errors between predicted and tested maximum chamber pressures being − 0.57, − 0.62, and − 0.65%, respectively. Moreover, this paper analyzed the variation laws of physical quantities inside the barrel as well as the influence of temperature on chamber pressure and muzzle velocity in-depth. This software provides a powerful tool for guiding charge design and optimizing interior ballistic of large-caliber naval guns.