A method for determining the target line size for solid propellant burning rate test

A technology of solid propellants and determination methods, which is applied in special data processing applications, chemical analysis by combustion, design optimization/simulation, etc., and can solve problems such as low strength of the target line, easy breakage of the target line, and large size of the target line. Achieve the effect of strong adaptability to conditions, simple determination process and high accuracy

Active Publication Date: 2020-07-17
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the strength of the target wire made of lead-antimony alloy is low, and the target wire with a smaller diameter is easy to break during the assembly process. From the perspective of experimental operation, the diameter of the target wire is required to be larger, so an optimal target wire size is required. Determine the method to make the size of the target line as large as possible on the basis of meeting the timing accuracy

Method used

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  • A method for determining the target line size for solid propellant burning rate test
  • A method for determining the target line size for solid propellant burning rate test
  • A method for determining the target line size for solid propellant burning rate test

Examples

Experimental program
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Embodiment 1

[0031] The propellant to be tested for the burning rate is a double-base propellant. The propellant is cut into a cylindrical drug rod with a size of Φ5×60mm, and the combustion wave curve of the drug rod is tested at 3MPa. Surface temperature t ∞ =600K. The target line used in the burning rate test is lead-antimony alloy wire with a melting point of 519K, and the length of the target line embedded in the propellant bar can be known from the size of the propellant bar to be 5mm. The burning rate test requires the maximum fusing time [τ] of the target line to be 1.7ms, and the optimum target line diameter for the propellant in the 3MPa burning rate test calculated by the mathematical model is 1.1mm.

Embodiment 2

[0033] The propellant to be tested for the burning rate is a double-base propellant. The propellant is cut into a cylindrical drug rod with a size of Φ5×60mm, and the combustion wave curve of the drug rod is tested at 10MPa. Surface temperature t ∞ =600K. The target line used in the burning rate test is lead-antimony alloy wire with a melting point of 500K, and the length of the target line embedded in the propellant bar is 5 mm from the size of the propellant bar. The burning rate test requires the maximum fusing time [τ] of the target line to be 4.1ms, and the optimum target line diameter for the propellant in the 10MPa burning rate test calculated by the mathematical model is 2.3mm.

Embodiment 3

[0035] The propellant to be tested for the burning rate is a fuel-rich propellant. Cut the propellant into cuboid sticks with a size of 4×4×60mm, and test the combustion wave curve of the stick at 8MPa. The propellant obtained through the combustion wave test experiment Burning surface temperature t ∞ =700K. The target line used in the burning rate test is a lead-antimony alloy wire with a melting point of 500K, and the length of the target line embedded in the propellant bar is 4mm from the size of the propellant bar. The burning rate test requires the maximum fusing time [τ] of the target line to be 4.7ms, and the optimum target line diameter for the propellant's burning rate test at 8MPa calculated by the mathematical model is 3.3mm.

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Abstract

The invention discloses a method for determining the size of a target line used for testing the burning rate of solid propellant. During the target line method burning rate testing process, selection of the size of the target line directly refers to the timing error of the system and the experiment operation reliability. On the basis of the fusing process of the target line during the burning rate testing process, the convective heat transfer process between the target line and fuel gas is described through a heat transfer formula, the maximum target line diameter satisfying the timing accuracy requirement is obtained by solving the formula, and therefore the method for determining the size of the target line used for testing the burning rate is formed. According to the invention, the defect that the size of the target line is determined through experience at present is repaired, and the method for determining the size of the target line used for testing the burning rate of solid propellant has important significance for improving the target line timing precision, the experiment operation reliability and the burning rate test standardization level.

Description

technical field [0001] The invention relates to a method for determining the size of a target line for solid propellant burning rate testing, which is especially suitable for the burning rate testing of low burning rate and low burning temperature propellant. Background technique [0002] Solid propellant is the propulsion energy of various solid rocket motors, and its performance parameters are crucial to the improvement of the engine performance level. The burning rate is one of the core performance parameters of solid propellants, and accurate acquisition of the burning rate value is of great significance for the design of rocket engines and the adjustment of propellant formulations. The burning rate of solid propellants can only be accurately obtained by experimental methods. Commonly used test methods for burning rate include constant pressure bomb method, closed burner method and engine method. Among them, the constant pressure bomb method has reliable test results, lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G01N31/12G06F119/08
CPCG01N31/12G06F30/20G06F2119/08
Inventor 孙志华刘林林仪建华轩春雷王长健王英红孙美许毅秦钊
Owner XIAN MODERN CHEM RES INST
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