Method for measuring the dispersion angle of a gaseous product plume after ignition of a solid propellant

By using high-speed cameras and image processing technology, combined with the least squares method and linear regression, the problem of the inability to quickly and accurately measure the plume divergence angle of solid propellant vaporization products after ignition in existing technologies has been solved. This achieves efficient and low-cost plume divergence angle measurement, which is suitable for transient plume measurement in electromagnetic accelerator thrusters.

CN116044616BActive Publication Date: 2026-02-13NAT UNIV OF DEFENSE TECH
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Patent Information

Application Number
CN202310073468.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-01-13
Publication Date
2026-02-13
Estimated Expiration
2043-01-13

AI Technical Summary

Technical Problem

Existing methods cannot quickly and accurately measure the plume divergence angle of solid propellant vaporization products after ignition, especially the divergence angle of transient plumes, without affecting the performance of the thruster.

Method used

By employing high-speed cameras and image processing technology, the expansion motion images of gasification products are acquired and analyzed. The least squares method and linear regression are combined to calculate the plume divergence angle of the gasification products. This avoids equipment intrusion into the propeller and can be achieved using a high-speed camera mounted on the side.

Benefits of technology

It enables transient plume measurement at the ignition end of the thruster, improving the measurement range and accuracy, reducing costs, and without affecting the normal performance of the thruster.

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Abstract

The present application belongs to the field of measuring the plume divergence angle of the gasification product of a thruster, and particularly relates to a method for measuring the plume divergence angle of the gasification product of a solid propellant after ignition, comprising the following steps: obtaining a background image before ignition of the solid propellant and a gasification product inflation movement image during the ignition process; comparing the background image and the gasification product inflation movement image to obtain a gasification product image; solving the radial distribution of radiation intensity on N cross sections of the gasification product image; determining the maximum intensity value on each cross section and calculating the position of 98% maximum intensity value on each cross section; using the least square method to perform linear regression on the positions of all 98% maximum intensity values, calculating the slope of the regression straight line, and calculating the plume divergence angle of the gasification product according to the slope of the regression straight line. The plume divergence angle measurement method provided by the present application ensures measurement efficiency and high measurement accuracy.
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