A device and method for measuring sound velocity of solid propellant under pressure change conditions
A solid propellant, propellant technology, applied in the aerospace field, to achieve the effect of accurate correction
Active Publication Date: 2021-05-18
DALIAN UNIV OF TECH
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Problems solved by technology
The device solves the problem of propellant deformation measurement in a closed high-pressure environment, and can accurately measure the influence of propellant deformation on sound velocity in a pressure environment, thereby obtaining a more accurate corrected sound velocity; at the same time, the experimental device has a simple structure, convenient pressure adjustment, and easy operation. Convenient
Method used
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Embodiment 1
[0032] Simulate a pressure environment with an internal pressure of 25 MPa; the test propellant sample 5 is a cylindrical solid propellant whose main component is hydroxyl-terminated polybutadiene.
[0033] 1) The inner diameter of the design pressure vessel cylinder 7 is φ=40mm, and the length is 200mm. To establish a pressure environment, use a high-pressure air pump to pressurize the pressure correction device through the inlet and outlet holes 9, and measure its internal pressure with a precision pressure gauge; Location.
[0034] 2) In order to ensure good sealing performance, the cone angle of the coupling material 4 is designed to be 15°, the thickness of the coupling material 4 is 20mm, the diameter of the inner surface is φ=40mm, and the diameter of the outer surface is φ=30mm, and it is installed on the left end cover 3; the left end cover 3 and the pressure vessel cylinder 7 are sealed with an O-ring, and the size of the sealing ring is φ51mm (outer diameter)×3mm (...
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Abstract
The invention belongs to the technical field of aerospace and provides a device and method for measuring the sound velocity of solid propellant under the condition of pressure change. The device uses compressed air to establish an internal pressure environment, and the main parameters are adjustable, which can accurately correct the sound velocity change of the solid propellant caused by the pressure of the combustion chamber when the engine is working. It is characterized by using a high-pressure air pump to establish a high-pressure environment, and using a high-precision displacement sensor to measure the deformation of the propellant caused by pressure, and then obtain its sound velocity through an ultrasonic transducer and testing software and perform pressure correction. The effects and benefits of the present invention are that the propellant deformation error caused by the high-pressure environment can be accurately given, the influence of the environmental pressure on the internal sound velocity of the solid propellant can be obtained directly, and an experimental method and implementation means can be provided for the pressure correction of the ultrasonic dynamic burning rate measurement; Compared with the existing closed container pressure correction experiment, the deformation amount of the propellant under the pressure environment can be accurately measured, so that the correction is more accurate.
Description
technical field [0001] The invention belongs to the field of aerospace technology, and relates to the ultrasonic dynamic testing technology of solid propellant burning rate, in particular to a measurement error correction device caused by the deformation of solid propellant and the change of internal sound velocity due to the internal pressure change of the engine. Background technique [0002] The solid propellant burning rate is an important parameter in the design of solid rocket motors, which is defined as the thickness of the part of the propellant burned along the normal direction of the propellant burning surface per unit time. With the rapid development of solid rocket motor technology, a more accurate and objective expression method of burning rate is needed to reflect the influence of external environment on the combustion performance of solid propellant. [0003] Ultrasonic dynamic burning rate test technology is the main technical method for studying the dynamic ...
Claims
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IPC IPC(8): G01N31/12G01N29/07
CPCG01N29/07G01N31/12G01N2291/011G01N2291/023
Inventor 孙得川罗天佑
Owner DALIAN UNIV OF TECH