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Method for estimating ballistic parameters in combustion light-gas gun

A technology for internal ballistics and light gas guns, which is applied in the field of internal ballistic parameter estimation of combustion light gas guns, can solve the lack of detailed description of the single-zone model flow field, does not have the ability to accurately describe the development process of combustion light gas guns, and cannot give internal parameters. Problems such as the distribution of ballistics in the bore achieve the effects of high accuracy, high engineering significance, and wide adaptability

Active Publication Date: 2020-10-16
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] However, due to the lack of detailed description of the flow field in the above-mentioned single-zone model, the in-bore distribution of internal ballistic parameters cannot be given, and it does not have the function of accurately describing the development process of detonation combustion in the combustion light gas gun bore

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  • Method for estimating ballistic parameters in combustion light-gas gun
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  • Method for estimating ballistic parameters in combustion light-gas gun

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Embodiment Construction

[0026] Such as figure 1 As shown, the ballistic parameter estimation method in the combustion light gas cannon of the present invention comprises the following steps:

[0027] (10) Obtain initial parameters of the combustion chamber: obtain the solution domain and cross-sectional area of ​​the combustion chamber, and the distribution of the main parameters on the solution domain, the main parameters including pressure, temperature, velocity and composition;

[0028] (20) Construct the N-S model of the compressible reaction flow: according to the characteristics of the internal ballistics of the burning light gas gun, a one-dimensional viscous compressible reaction flow numerical model based on the Navier-Stokes control equations is constructed, and the Navier-Stokes control equations include three Fundamental equations and component transport equations;

[0029] (30) Initialize the node parameter matrix: according to the estimated flame thickness, thickening coefficient and p...

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Abstract

The invention discloses a method for estimating ballistic parameters in a combustion light-gas gun. The method comprises the following steps: (10) acquiring initial parameters of a combustion chamber:acquiring a solution domain and a sectional area of the combustion chamber and distribution of main parameters on the solution domain; (20) constructing a compressible reaction flow N-S model: constructing a one-dimensional viscous compressible reaction flow numerical model according to ballistic characteristics in the combustion light gas gun; (30) initializing a node parameter matrix: carryingout node interpolation on main parameters and initializing the main parameters to a main variable of a control equation set; (40) solving a node parameter matrix: solving the node parameter matrix based on a WAF-HLLC Riemann solver to obtain main parameters; and (50) determining internal ballistic parameters: calculating flow field parameters according to the main parameters, inversely solving anenthalpy value formula based on a Newton approximation method, updating the node temperature T, and obtaining the internal ballistic parameter distribution of the combustion light gas gun at a specified moment. The ballistic parameter estimation method is high in accuracy and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of ballistic parameter determination, in particular to a method for estimating internal ballistic parameters of a combustion light gas gun based on a WAF-HLLC format Riemann solver. Background technique [0002] Combustion light gas gun is a new concept artillery that uses light gas to burn and expand to push the projectile forward at high speed. Because light gas is used to push the projectile, the pressure difference between the bottom of the projectile and the bottom of the chamber is reduced. When the barrel is longer, it can Obtain a greater initial velocity. Since the combustion light gas gun uses high-pressure light combustible gas mixture as the propellant, the internal ballistic process is quite different from that of conventional artillery. After the gas propellant is ignited, the flame will accelerate rapidly to form a deflagration flame, and detonation will also occur under certain conditions. ...

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Application Information

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IPC IPC(8): G06F30/20G06F17/16G06F17/12G06F119/14G06F111/10G06F119/18
CPCG06F17/16G06F17/12Y02T90/00
Inventor 刘宁周飞张相炎孙明亮
Owner NANJING UNIV OF SCI & TECH
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