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: 2019-03-26
DALIAN UNIV OF TECH
View PDF20 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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 (...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention belongs to the technical field of aerospace, and provides a device and method for measuring the sound velocity of a solid propellant under pressure change conditions. The device adopts compressed air to establish an internal pressure environment, and main parameters are adjustable so that the change of the sound velocity of the solid propellant caused by the combustion chamber pressure during engine operation can be accurately corrected. The device is characterized in that a high-pressure air pump is used for establish a high-pressure environment, a high-precision displacement sensor is used for measuring the amount of propellant deformation caused by the pressure, and then the sound velocity of the solid propellant is obtained and pressure correction is performed through anultrasonic transducer and a test software. The device and method have the beneficial effects that a deformation error of the propellant 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 is directly obtained, and experimental methods and accomplishing means for the pressure correction of ultrasonic dynamic burning rate measurement are provided; and compared with an existing closed container pressure correction experiment, the amount of deformation of the propellant under pressure can be accurately measured, and the correction is enabled to be 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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01N31/12G01N29/07
CPCG01N29/07G01N31/12G01N2291/011G01N2291/023
Inventor 孙得川罗天佑
Owner DALIAN UNIV OF TECH