Preliminary Application Correctness Assessment of Physical Burning Law in Interior Ballistics Phenomena Modeling in Small-Caliber Guns

The paper presents the results of application correctness assessment of a physical burning law in theoretical interior ballistics phenomena modeling. Using the proposed lumped-parameters thermodynamic interior ballistics model, ballistic curves were obtained. In order to validate the used theoretical approach, experimental tests were conducted. Pressure courses, muzzle velocity and temperature courses of the barrel surface were measured and compared with the modeling results. The results obtained with the use of the geometrical burning law model showed a better agreement with the experiment than the results obtained with the physical burning law in which the dynamic vivacity function was estimated using closed vessel tests. The possible reason of this effect is the dependence of the dynamic vivacity function on the loading density, which is confirmed in the literature.