Simple Theoretical Analysis and Experimental Investigation of Burning Processes for Stick Propellant.

摘要

The interior ballistic performance of propelling charges employing perforated unslotted stick propellant often cannot be simulated using either lumped-parameter or two-phase flow models without altering input data beyond realistic limits. In this work, a lumped-parameter model has been modified to account for enhanced burning within the perforations of stick propellant, a consequence of higher local pressures accompanying the choking of product gases exiting the perforations. A further extension allows treatment of additional surface area exposed should grain fracture occur as a result of excessive internal pressure. Results obtained using the modified code are compared to 155-mm howitzer firings. Data from closed-bomb firings which demonstrate the same effect are also included.