Study Of Heat Transfer And Erosion In Gun Barrels PDF Download
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| Author | : |
| Publisher | : |
| Total Pages | : 253 |
| Release | : 1973 |
| Genre | : |
| ISBN | : |
Download Study of Heat Transfer and Erosion in Gun Barrels Book in PDF, ePub and Kindle
This study models the combustion, solid propellant movement, gas dynamics, projectile dynamics, transient boundary layer, heat transfer, and barrel metal temperatures in a gun barrel. This is accomplished by rigorous development of the coupled partial differential equations and carrying out a detailed numerical solution to these equations. Comparison of barrel temperature solutions to experimental data is shown. Erosion mechanisms are discussed in the light of these solutions. This model is then used to study hypotheses concerning the heat transfer, temperature, and erosion effects of submicron size solid particle additives (TiO2) to gun propellants. A mechanism not previously studied offers excellent theoretical results in explaining the reduced erosion.
| Author | : |
| Publisher | : National Academies |
| Total Pages | : 72 |
| Release | : 1975-01-15 |
| Genre | : History |
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Download Erosion in Large Gun Barrels Book in PDF, ePub and Kindle
Confronted with problems associated with the continual upgrading of field guns, reducing the number of different items in supply and lowering overall costs, the Department of the Army has need for improved methods of reducing erosion and extending the wear life of long range cannon. The National Materials Advisory Board was asked to consider all facets of this need and to make recommendations. Erosion in Large Gun Barrels assesses the nature of the bore erosion problem; identifies fruitful areas of research; assesses the state of technology of materials and methods in areas which may become significant to gun tubes of improved performance; and suggests experimental techniques, devices, and instruments and methods of reducing data to enhance the continuing coordination of the activities of the three Services.
| Author | : John Corner |
| Publisher | : |
| Total Pages | : 472 |
| Release | : 1950 |
| Genre | : Technology & Engineering |
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Download Theory of the Interior Ballistics of Guns Book in PDF, ePub and Kindle
| Author | : L. H. Russell |
| Publisher | : |
| Total Pages | : 16 |
| Release | : 1975 |
| Genre | : Ordnance |
| ISBN | : |
Download Simplified Analysis of the Bore Surface Heat Transfer Reduction in Gun Barrels as Achieved by Using Wear-reducing Additives Book in PDF, ePub and Kindle
| Author | : V. Alexiades |
| Publisher | : CRC Press |
| Total Pages | : 342 |
| Release | : 1992-11-01 |
| Genre | : Science |
| ISBN | : 9781560321255 |
Download Mathematical Modeling Of Melting And Freezing Processes Book in PDF, ePub and Kindle
Presents mathematical models of melting and solidification processes that are the key to the effective performance of latent heat thermal energy storage systems, utilized in a wide range of heat transfer and industrial applications.
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| Total Pages | : 51 |
| Release | : 1996 |
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Download Modeling of Gun Barrel Surface Erosion Book in PDF, ePub and Kindle
Results and interpretations of numerical simulations of some dominant processes influencing gun barrel propellant combustion and flow-induced erosion are presented. Results include modeled influences of erosion reduction techniques such as solid additives, vapor phase chemical modifications, and alteration of surface solid composition through use of thin coatings. Precedents and historical perspective are provided with predictions from traditional interior ballistics compared to computer simulations. Accelerating reactive combustion flow, multiphase and multicomponent transport, flow-to-surface thermal/momentum/phase change/gas-surface chemical exchanges, surface and micro-depth subsurface heating/stress/composition evolution and their roles in inducing surface cracking, spall, ablation, melting, and vaporization are considered. Recognition is given to cyclic effects of previous firing history on material preconditioning. Current perspective and outlook for future are based on results of a US Army-LLNL erosion research program covering 7 y in late 1970s. This is supplemented by more recent research on hypervelocity electromagnetic projectile launchers.
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| Total Pages | : 12 |
| Release | : 1997 |
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Download Thermochemical Erosion Modeling of the 25mm M242/M791 Gun System Book in PDF, ePub and Kindle
The MACE gun barrel thermochemical erosion modeling code addresses wall degradations due to transformations, chemical reactions, and cracking coupled with pure mechanical erosion for the 25-mm M242/M791 gun system. This predictive tool provides gun system design information that is otherwise impractical. The nitrided A723 and 0.002-inch plated chromium/A723 wall materials are evaluated for erosion using the M242 Cycle A firing scenario. This complex computer analysis is based on rigorously evaluated scientific theory that has been validated in the rocket community over the last forty years. Our gun erosion analysis includes the standard interior ballistics gun code (XNOVAKTC), the standard nonideal gas-wall thermochemical rocket code modified for guns (CCET), the standard mass addition boundary layer rocket code modified for guns (MABL), and the standard wall material ablation conduction erosion rocket code modified for guns (MACE). This analysis provides wall material erosion predictions and comparisons (ablation, conduction, and erosion profiles) as a function of time, travel (customer-selected 6-inch, 12-inch, 30-inch), and number of rounds to barrel condemnation. These M242/M791 gun system predictions agree well with the standard wall heat transfer/temperature profile code (FDHEAT) and actual measured gun system erosion data.
| Author | : |
| Publisher | : |
| Total Pages | : 948 |
| Release | : 1986 |
| Genre | : Engineering mathematics |
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Download Transactions of the Second Army Conference on Applied Mathematics and Computing Book in PDF, ePub and Kindle
| Author | : |
| Publisher | : |
| Total Pages | : 53 |
| Release | : 1991 |
| Genre | : |
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Download Heating of a Tank Gun Barrel: Numerical Study Book in PDF, ePub and Kindle
Heating of a gun barrel by repeated firing is modeled in a computer program that solves the one-dimensional (radial) unsteady heat condition equation by a second-order finite-difference procedure. Coupling with interior ballistics is accomplished by employing as input data the bore temperature and heat transfer histories computed by interior ballistics codes. Limited comparisons of outputs with experimental results show favorable agreement (20% differences or less). The code is exercised to study a number of aspects of the heat transfer process qualitatively (e.g., time history of heat transfer before and after shot exit) and to relate the current model to a more simplified analytical-empirical model.
| Author | : F. A. Vassallo |
| Publisher | : |
| Total Pages | : 129 |
| Release | : 1977 |
| Genre | : |
| ISBN | : |
Download Heat Transfer and Erosion in the Ares 75mm High Velocity Cannon Book in PDF, ePub and Kindle
Single-shot firings of the 75mm high velocity cannon conducted at Ares during initial weapon development, indicated potentially severe erosion of the breech end of the barrel (short barrel). Extended burst sequences were expected to aggravate the erosion thus threatening to shorten, intolerably, the practical barrel life. In an effort to improve longevity, Calspan conducted a study of the actual heating and erosion in the short barrel through experimental single-shot firing investigations using a fixture similar to that of the Ares Phase I cannon. Primary efforts in that study were directed to an assessment of the expected heating and erosion in the present 75mm cannon during rapid fire and the evaluation of potential solutions to indicated problems by use of barrel materials changes, and/or ammunition modifications. (Author).
