A Novel Interior Ballistic Prediction of Gun Propellants Based on Experimental Pressure-Apparent Burning Rate Model in Closed Vessel

2013 ◽  
Vol 668 ◽  
pp. 584-588
Author(s):  
Zheng Gang Xiao ◽  
San Jiu Ying ◽  
Wei Dong He ◽  
Fu Ming Xu
Keyword(s):  
Burning Rate ◽  
Relative Pressure ◽  
Rate Model ◽  
Closed Vessel ◽  
Ballistic Performance ◽  
New Model ◽  
Pressure Impulse ◽  
Form Function ◽  
Gun Propellants ◽  
Experimental Pressure

A new experimental pressure-apparent burning rate model was established based on the recorded pressure-time data in the closed vessel to study the actual burning gas generate rate of a propellant whose form function is not available. The new burning model can replace the Vieille’s law and form function of propellants in the interior ballistic equations to predict the interior ballistic performance of gun. As distinct from the traditional geometric form function based burning rate model, the new model introduced the concept of relative pressure impulse related to the actual burnt web thickness of propellant statistically. The apparent burning rate was expressed by the propellant mass fraction burnt vs. relative pressure impulse curve. The interior ballistic simulation of selected gun propellants was conducted using the new burning rate model. The results predicted by the new model show a good agreement with the classic interior ballistic predication results though the agreement with the experimental results is still to be improved.

scholarly journals ESTIMATION OF BALLISTIC PARAMETERS OF GUN PROPELLANTS THROUGH CLOSED VESSEL EXPERIMENT MODELING

2005 ◽  
Vol 4 (1) ◽  
pp. 50 ◽  
Author(s):  
J. L. S. P. De Oliveira ◽  
A. A. M. F. Filho ◽  
G. M. Platt ◽  
F. C. Peixoto
Keyword(s):  
Maximum Likelihood ◽  
Burning Rate ◽  
Pressure Profile ◽  
Statistical Procedure ◽  
System Of Differential Equations ◽  
Closed Vessel ◽  
Empirical Correlations ◽  
Gun Propellants ◽  
Energy Balances ◽  
Theoretical Pressure

Closed vessels have being used for the regression of lumped ballistic parameters for decades. However, if material and energy balances are coupled with burning rate empirical correlations, several uncorrelated parameters can be estimated, which describe more accurately the thermochemical behavior of the gases generated, even if the chemical composition of the propellant is unknown (as when the propellant is aged, for instance). This research presents such approach leading to a system of differential equations which are integrated to produce a theoretical pressure profile in the vessel, highly dependent on the choice of empirical parameters. Such parameters are manipulated according to the Maximum Likelihood statistical procedure, which leads to the best set of parameters to describe the propellant.

A new closed vessel for determining the ballistic performance of high energy solid and liquid gun propellants

2000 ◽  
Vol 18 (4) ◽  
pp. 311-330 ◽  
Author(s):  
S. B. Langston ◽  
S. J. McGuigan ◽  
J. M. Bellerby ◽  
M. P. B. Laird
Keyword(s):  
High Energy ◽  
Closed Vessel ◽  
Ballistic Performance ◽  
Gun Propellants

scholarly journals Application of transient burning rate model of solid propellant in electrothermal-chemical launch simulation

2016 ◽  
Vol 12 (2) ◽  
pp. 81-85 ◽  
Author(s):  
Yan-jie Ni ◽  
Yong Jin ◽  
Gang Wan ◽  
Chun-xia Yang ◽  
Hai-yuan Li ◽  
...  
Keyword(s):  
Burning Rate ◽  
Solid Propellant ◽  
Rate Model ◽  
Transient Burning Rate

Development of Grid Depression Model for GalaxyCosmo-S

2014 ◽  
Author(s):  
Hiroki Koike ◽  
Kazuki Kirimura ◽  
Kazuya Yamaji ◽  
Shinya Kosaka ◽  
Hideki Matsumoto
Keyword(s):  
Power Distribution ◽  
Measured Data ◽  
Distribution Analysis ◽  
New Model ◽  
Form Function ◽  
Local Grid ◽  
Homogenized Model ◽  
The Difference ◽  
Reconstruction Model ◽  
Grid Position

An efficient grid depression reconstruction model on axial assembly power distribution was developed for MHI nuclear design code system GalaxyCosmo-S. The objective of this paper is to present the background, methodology and its application of the new model in GalaxyCosmo-S. In order to consider the grid depression effect to the homogeneous axial power distribution obtained from 3D nodal core calculation, the new model employs the concept of the pin-power reconstruction model widely used in modern core design codes. In the new model, axial heterogeneous assembly power distribution is calculated by synthesizing the grid form function to the axial homogeneous power distribution by nodal calculation. The form function is pre-produced by fitting the local grid depression data processed from the measured axial thimble reaction rate in the grid position. By incorporating the measured data, the form function can reflect the precise grid depression information. According to the present study, it was shown that the form function has a burnup dependency for its depth, and it is prepared for each fuel type and axial grid position. In order to confirm the applicability of the present method to the existing PWRs, the predicted axial power distribution by GalaxyCosmo-S was compared with the measured data by the movable detector (M/D). As a result, the good agreements were confirmed without any specific trends for burnup condition. In addition, the difference of axial power distribution between predicted and measured data was statistically analyzed for multiple plants, cycles and burnup conditions. From the results, it is confirmed that the systematic over- or under-estimations of the power distribution observed in the grid homogenized model are reduced by the grid depression model. So this model is suitable for the 3D power distribution analysis and FQ uncertainty evaluation.

scholarly journals On Influence of Mechanical Properties of Gun Propellants on Their Ballistic Characteristics Determined in Closed Vessel Tests

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3243
Author(s):  
Radosław Trębiński ◽  
Jacek Janiszewski ◽  
Zbigniew Leciejewski ◽  
Zbigniew Surma ◽  
Kinga Kamińska
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Point Of View ◽  
Closed Vessel ◽  
Shape Functions ◽  
Stress Strain ◽  
Static Compression ◽  
Burning Process ◽  
Double Base ◽  
Gun Propellants

The geometric burning law of gun propellants is widely used in computer codes used for the simulations of the internal ballistics of guns. However, the results of closed vessel tests prove that the burning process of some propellants deviates from the geometric law. Validation of the hypothesis that observed deviations can be attributed to the cracking of propellant grains was the aim of this work. In order to verify the hypothesis, three types of gun propellants were chosen with considerably differing mechanical strengths: a single-base propellant, a double-base propellant, and a composite propellant. The mechanical properties of the gun propellants were tested using a quasi-static compression method with strain rate values of the order of 0.001 s−1 and the Split Hopkinson Pressure Bar technique with the strain rate in the range of 1000–6000 s−1. The mechanical responses of the propellants were assessed on the basis of the true stress–strain curves obtained and from the point of view of the occurrence of cracks in the propellant grains specimens. Moreover, closed vessel tests were performed to determine experimental shape functions for the considered gun propellants. Juxtaposition of the stress‒strain curves with the experimental shape functions proved that the observed deviations from the geometrical burning law can be attributed mainly to the cracking of propellant grains. The results obtained showed that the rheological properties of propellants are important not only from the point of view of logistical issues but also for the properly controlled burning process of propellants during the shot.

Burning Rate Development in a Closed Vessel of Arbitrary Shape and Variable Volume, for Variable but Uniform Pressure

1969 ◽  
Vol 91 (2) ◽  
pp. 69-71 ◽  
Author(s):  
J. L. Bascunana
Keyword(s):  
Burning Rate ◽  
Arbitrary Shape ◽  
Numerical Solutions ◽  
Combustion Process ◽  
Uniform Pressure ◽  
Closed Vessel ◽  
Mass Burning Rate ◽  
Variable Volume ◽  
Variable Chemical ◽  
Rate Development

An expression is derived to compute the mass burning rate in a closed vessel for which the variable volume and pressure during the process of combustion are known. The solution presented will be satisfactory for applications where the effects of heat transfer and variable chemical reaction during the combustion process can be neglected, and may serve as a basis of comparison for more complete numerical solutions.

Form Function for Propellants in Closed Vessel Work

1980 ◽  
Vol 5 (1) ◽  
pp. 9-14 ◽  
Author(s):  
D. Vittal ◽  
S. Singh
Keyword(s):  
Closed Vessel ◽  
Form Function

scholarly journals ESTIMATION OF BALLISTIC PARAMETERS OF GUN PROPELLANTS THROUGH CLOSED VESSEL EXPERIMENT MODELING

2005 ◽  
Vol 4 (1) ◽  
Author(s):  
J. L. S. P. De Oliveira ◽  
A. A. M. F. Filho ◽  
G. M. Platt ◽  
F. C. Peixoto
Keyword(s):  
Chemical Composition ◽  
Maximum Likelihood ◽  
Pressure Profile ◽  
Statistical Procedure ◽  
System Of Differential Equations ◽  
Closed Vessel ◽  
Empirical Correlations ◽  
Gun Propellants ◽  
Energy Balances ◽  
Theoretical Pressure

Closed vessels have being used for the regression of lumped ballistic parameters for decades. However, if material and energy balances are coupled with burning rate empirical correlations, several uncorrelated parameters can be estimated, which describe more accurately the thermochemical behavior of the gases generated, even if the chemical composition of the propellant is unknown (as when the propellant is aged, for instance). This research presents such approach leading to a system of differential equations which are integrated to produce a theoretical pressure profile in the vessel, highly dependent on the choice of empirical parameters. Such parameters are manipulated according to the Maximum Likelihood statistical procedure, which leads to the best set of parameters to describe the propellant.

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