Modeling gun bore heat transfer and degradation

Chicago: 10th AIAA Joint Thermophysics & Heat Transfer Conf. 2010, - 10 р.Vented combustor experiments are often successful at providing relative erosion results but these results are typically inconclusive when compared to other vented combustor experiments. As a result of this deficiency, a new method for successfully modeling erosion of vented combustor cannon bores materials has been developed. This modeling method, in conjunction with limited scale firings, provides a cost effective means of comprehensively studying erosion of coated cannon bore materials. The method is derived from our very successful similar method for modeling coated cannon bore erosion of medium and large caliber gun systems. These system models are based on years of eroded cannon characterizations and erosion theory development. We have fired and modeled gun steel, chromium, tantalum, molybdenum, rhenium, and niobium cannon bore protection materials. Each of these material types has a different set of erosive degradation thresholds that are governed by the presence of a less reducing (more metal oxidizing), more reducing (more metal carburizing), or intermediate reducing solid propellant combustion environment.