Thermal Analyses and Experimental Validation of External Cooling Method for a Gun Barrel

2014 ◽  
Vol 11 (13) ◽  
pp. 4759-4767 ◽  
Author(s):  
Pu Qu
Keyword(s):  
Experimental Validation ◽  
Thermal Analyses ◽  
Gun Barrel ◽  
Cooling Method ◽  
External Cooling

Transient Thermal Analyses of Midwall Cooling and External Cooling Methods for a Gun Barrel

2010 ◽  
Vol 132 (9) ◽  
Author(s):  
Avanish Mishra ◽  
Amer Hameed ◽  
Bryan Lawton
Keyword(s):  
Heat Transfer ◽  
Cooling System ◽  
Thermal Analyses ◽  
Temperature History ◽  
Fe Model ◽  
Gun Barrel ◽  
External Cooling ◽  
Transient Thermal ◽  
Cooling Methods ◽  
Simulation Scheme

Liquid cooling methods are often used for thermal management of a large caliber gun barrel. In this work, transient thermal analyses of midwall-cooled and externally cooled gun barrels were performed. At first, a novel simulation scheme was developed for the computation of the gun barrel temperature history (temperature variation over time), and its experimental validation was performed. In the computational scheme an internal ballistics code, GUNTEMP8.EXE, was developed to simulate the total heat transfer per cycle for the given ammunition parameters. Subsequently, a finite element (FE) model of the barrel was developed in ANSYS 11.0. Heat transfer to the barrel was approximated by an exponentially decaying heat flux. The FE model was solved to compute for barrel temperature history. Simulations were performed for a burst of 9 cycles, and the results were found to agree with the experimental measurements. Subsequently, the simulation scheme was extended to analyze a burst of 40 cycles at 10 shots per minute (spm). Three cases were investigated as follows: (1) a naturally cooled gun barrel, (2) a gun barrel with midwall cooling channels, and (3) an externally cooled gun barrel. Natural cooling was found insufficient to prevent cook-off, whereas midwall and external cooling methods were found to eliminate any possibility of it. In the context of a self-propelled howitzer, a midwall-cooled gun barrel connected to an engine cooling system was also analyzed.

Two-Dimensional Transient Temperature Distribution in Cylindrical Bodies With Pulsating Time and Space-Dependent Boundary Conditions

1974 ◽  
Vol 96 (3) ◽  
pp. 300-306 ◽  
Author(s):  
J. A. Copley ◽  
W. C. Thomas
Keyword(s):  
Heat Flux ◽  
Boundary Conditions ◽  
Analytical Techniques ◽  
Transient Temperature ◽  
Two Dimensional ◽  
Transient Temperature Distribution ◽  
Gun Barrel ◽  
External Cooling ◽  
Periodic Heat ◽  
Good Agreement

The two-dimensional conduction equation is solved for a hollow cylinder subjected to a series of heat flux pulses on the inner boundary. The periodic heat flux is represented by an exponentially decreasing pulse with a spatial distribution of peak magnitude. The analytical techniques and representation of the boundary conditions apply to different situations involving pulsating boundary conditions. An application to the gun barrel heating problem is given. Calculated bore surface and internal temperature histories are in good agreement with experimental data. During the actual firing time in rapidly-firing guns, results show that external cooling is generally ineffective for controlling barrel bore surface temperature.

scholarly journals Temperature Profiles in a Micro Processor Cooled by Direct Refrigerant Evaporation

2016 ◽  
Vol 22 (3) ◽  
pp. 111-126
Author(s):  
Zygmimt Lipnicki ◽  
Haima Lechów ◽  
Kataizyna Pantoł
Keyword(s):  
Temperature Distribution ◽  
Analytical Solution ◽  
Theoretical Analysis ◽  
Temperature Profiles ◽  
Stationary Model ◽  
Cooling Systems ◽  
Cooling Method ◽  
External Cooling ◽  
Liquid Evaporation

Abstract Ail analytical solution to the equation for cooling of a unit, in the interior of which heat is generated, is presented. For that reason, a simplified non-stationary model for determination of the temperature distribution within the unit, temperature of the contact between unit and a liquid layer, and the evaporating layer thickness in the function of time, is elaborated. A theoretical analysis of the external cooling of the unit, by considering the phenomenon of the liquid evaporation with the use of the Fourier and Poisson’s equations, is given. Both, stationary- and non-stationary description of the cooling are shown. The obtained results of simulation seems to be useful in designing the similar cooling systems. A calculation mode for a cooling systems equipped with the compressor heat pump, as an effective cooling method, is also performed.

The Use of Compound Cooling Holes for Film Cooling at the End Wall of Combustor Simulator

2014 ◽  
Vol 695 ◽  
pp. 371-375
Author(s):  
Nor Azwadi Che Sidik ◽  
Shahin Salimi
Keyword(s):  
Gas Turbine ◽  
Film Cooling ◽  
Turbine Blades ◽  
Internal Cooling ◽  
Gas Turbine Blades ◽  
Turbine Cooling ◽  
Cooling Flow ◽  
Cooling Method ◽  
External Cooling ◽  
Cylindrical Holes

Gas turbine cooling can be classified into two different schemes; internal and external cooling. In internal cooling method, the coolant provided by compressor is forced into the cooling flow circuits inside turbine components. Meanwhile, for the external cooling method, the injected coolant is directly perfused from coolant manifold to save downstream components against hot gases. Furthermore, in the latter coolant scheme, coolant is used to quell the heat transfer from hot gas stream to a component. There are several ways in external cooling. Film cooling is one of the best cooling systems for the application on gas turbine blades. This study concentrates on the comparison of experimental, computational and numerical investigations of advanced film cooling performance for cylindrical holes at different angles and different blowing ratios in modern turbine gas.

A Novel Scheme for Computing Gun Barrel Temperature History and Its Experimental Validation

2010 ◽  
Vol 132 (6) ◽  
Author(s):  
Avanish Mishra ◽  
Amer Hameed ◽  
Bryan Lawton
Keyword(s):  
Finite Element ◽  
Temperature Variation ◽  
Experimental Validation ◽  
Temperature History ◽  
Experimental Measurements ◽  
The Finite Element Method ◽  
Gun Barrel ◽  
Internal Ballistics ◽  
Lumped Parameter ◽  
Over Time

An accurate modeling of gun barrel temperature variation over time is important to assess wear and the number of shot fires needed to reach cook-off. Using lumped parameter methods, an internal ballistics code was developed to compute heat transfer to the gun barrel for given ammunition parameters. Subsequently the finite element method was employed to model gun barrel temperature history (temperature variation over time). Simulations were performed for a burst of nine shots and the results were found to match satisfactorily to the corresponding experimental measurements. Wear or erosion of the barrel during a gun fire is very sensitive toward the maximum bore surface temperature. The proposed scheme can accurately simulate gun barrel temperature history; hence improved wear calculations can be made with it. An important and unique advantage of the developed scheme is that it easily couples internal ballistics simulations with the finite element methods.

Experimental validation of the predicted TGR5 binding mode model

2015 ◽  
Vol 53 (01) ◽  
Author(s):  
L Spomer ◽  
CGW Gertzen ◽  
D Häussinger ◽  
H Gohlke ◽  
V Keitel
Keyword(s):  
Experimental Validation ◽  
Binding Mode

ANALISIS BEBAN PENDINGINAN PADA COLD STORAGE UNTUK PENYIMPANAN DAGING

2019 ◽  
Vol 7 (1) ◽  
pp. 12-22
Author(s):  
Ratu Mutia Fajarani ◽  
Yopi Handoyo ◽  
Raden Hengki Rahmanto
Keyword(s):  
Experimental Method ◽  
Cold Storage ◽  
Freezing Point ◽  
Cooling Load ◽  
Internal Factors ◽  
External Cooling ◽  
Preservation Method ◽  
Load Calculation ◽  
Selection Of

Cooling is the best preservation method than others because the food that has been cooled will remain fresh and will not experience a change in taste, color and aroma, besides all the activities that cause decay will stop so that the cooled food will last longer. (Hartanto, 1984). With the proper cooling engine planning, it can help with spatial adjustments, adjustments to loading, estimation of the power to be used, and budget plans. That is what is commonly called the cooling load calculation. Calculation of cooling load needs to be carried out before planning. This is necessary because the magnitude of the pending load is very influential on the selection of the cooling engine so that the freezing point for preserving food can be accurate. Pendiginan burden is influenced by external and internal factors. With the experimental method, it is obtained the results of the external cooling load as the external cooling load is 11.6 kW, the inner cooling load is 138.8 kW and the performance work coefficient (COP) is 2.

Experimental Validation of Factors Causing Flicker from Frequency Feedback Method with Step Injection of Reactive Power

2018 ◽  
Vol 138 (8) ◽  
pp. 651-658 ◽  
Author(s):  
Keisuke Shirasaki ◽  
Naotaka Okada ◽  
Kenichiro Sano ◽  
Hideki Iwatsuki
Keyword(s):  
Experimental Validation ◽  
Reactive Power ◽  
Feedback Method
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