Solid propellant flameout critical pressure reduction rate testing method

Abstract

The invention discloses a solid propellant flameout critical pressure reduction rate testing method. The method includes the following steps: a high pressure nitrogen gas cylinder serves as a gas source, initial pressure is provided for a testing sample in a burning chamber through a booster pump, the pressure in the burning chamber rises to a threshold value through fuel gas after the sample is lighted, a high pressure electromagnetic valve is opened, and gas discharging is adjusted through the gas discharging amount. A data collection control system records changes of the pressure and the light strength in the burning chamber in the experiment process, the gas discharging amount is adjusted according to the calculated pressure descending rate and the condition whether the sample extinguished or not, and an experiment is performed again. According to the solid propellant flameout critical pressure reduction rate testing method, the problem that the initial pressure in the prior art is large in fluctuation is solved; by means of the method, the minimum flameout pressure reduction rates of different formula propellants under a certain pressure can be tested, the solid propellant flameout critical pressure strength under a certain condition can be tested, the testing range in the prior art is expanded, and the method can be used for testing the solid propellant pressure reduction flameout performance of energy management type tactical missiles and rocket projectiles.

Description

technical field [0001] The invention relates to a method for testing the critical depressurization rate of flameout after combustibles are burned, in particular, it is applied to the test of the critical depressurization rate of flameout of propellants and propellants. Background technique [0002] In order to improve the maneuverability, penetration capability and hit accuracy of the missile, the rocket engine as the power device needs to have the ability to control the thrust and to start multiple times. In order to realize the controllable thrust of the rocket engine and multiple starts, it is necessary to study the flameout engine technology. The key to the flameout engine technology is the study of the flameout conditions of solid propellants, and the critical depressurization rate, that is, the minimum depressurization rate for flameout under a certain pressure is the flameout condition. The key performance parameters studied are also the key design basis for rocket en...

AI Technical Summary

Problems solved by technology

[0006] 1. In the prior art, copper sheets, aluminum sheets and iron sheets with a certain thickness are selected as pressure relief fragments, and the uniformity and consistency of the thickness cannot be guaranteed during the processing; at the same time, the pressure relief fragments that are manually installed in place are squeezed Force and shear also do not guarantee consistency

In other words, the uncertainty of the strength of the pressure relief fragments will make it difficult to control the initial pressure in the combustion chamber within the allowable range, and the initial pressure fluctuations of each experiment are relatively large

[0007] 2. The existing technology cannot guarantee that the test sample will not be ignited during the pressure build-up process of the combustion chamber, nor can it guarantee that the test sample can be ignited after the completion of the pressure build-up of the combustion chamber, that is to say, the pressure of the test sample when it starts to burn is uncertain

[0008] 3. Existing test methods can only obtain the flameout curve equations in different initial pressure ranges, but cannot measure the flameout condition parameter - the critical pressure drop rate

[0009] 4. The existing technology uses the image characteristics of the diameter of the test sample taken by the high-speed camera to change with the burning time to identify whether the sample is flamed out during the pressure drop process, which leads to waste of resources.

In addition, in order to cooperate with the use of high-speed cameras, observation windows must be provided on the side wall of the combustion chamber, which makes the design and processing of the combustion chamber more complicated, and the difficulty of sealing technology is also increased.

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