Detection method for separated-out gas in ageing process of high energy solid propellant and device thereof

Abstract

The invention relates to a detection method for separated-out gas in an ageing process of a high energy solid propellant and a device thereof. The detection method comprises the following steps: placing a propellant sample into a sampling bag, sealing the sampling bag and inflating nitrogen, and placing the sampling bag into an oven to be stored and aged; after ageing, taking out the sampling bag,connecting the sampling bag to an absorption device and a sampling device; extracting gas by a sampling pump; absorbing the gas by the absorption device and developing color by the same; carrying outdetection by means of spectrophotometry; and calculating the content of an analyte according to a standard curve. The contents of NO, NO2 and nitrate can be detected at the same time. The detection method based on the test principle of N-ethylenediamine dihydrochloride spectrophotometry solves the problem that aged and separated-out gas is low in concentration and hard to collect and quantify bycollecting the gas by means of the high-temperature-resistant corrosion-resistant gas sampling bag; a series device is reasonably designed to absorb the gas in steps and determine the gas, so that thetesting efficiency is improved greatly. The detection method provided by the invention can be used for representing the consumption rate and the decomposing mode of nitrate or a stabilizer when the high energy solid propellant is stored and aged, thereby providing support for monitoring the stability of the performance of the propellant, estimating the safe life of an engine and the like.

Description

technical field [0001] The invention relates to a method for detecting gas precipitated during the aging process of a high-energy solid propellant, and belongs to the technical field of analysis and testing. Background technique [0002] High-energy solid propellants contain a large amount of nitrate ester plasticizers. During storage, nitrate esters will undergo slow physical volatilization, migration or chemical changes, producing toxic and harmful gases, which will affect the stability of the propellant itself. For example, if the content of nitrate ester decreases, the viscoelasticity of the propellant matrix will change and the mechanical properties will decrease; the heat accumulation generated by its decomposition may cause the propellant to spontaneously ignite; the gas product will increase the internal pressure of the engine, which may lead to damage to the structural integrity of the grain , Bonding interface debonding, etc. The type and content of these gas prod...

AI Technical Summary

Problems solved by technology

However, none of them can be directly applied to the detection of gases precipitated by the aging of propellants. The main reason is that the sampling of ambient air is convenient and the volume is large, and a large amount of air can be extracted for separate testing; while the amount of aging gas of propellants is small, it is difficult to collect, and repeated sampling cannot be performed.

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