The performance of solid rocket motors changes significantly under acceleration conditions

In order to study the effect of acceleration on the internal ballistic performance of the solid rocket motor, the combustion experiment must be carried out in a set acceleration field environment. During the experiment, first operate the frequency converter to make the transmission shaft of the test bench reach the set speed and provide the required acceleration field. In order to scientifically analyze and compare the experimental results, it is required to use the same chip-type charge engine and keep the filling parameters unchanged, that is, charge size and shape, nozzle material and throat diameter, igniter structure and charge volume No change. The engine is installed on the interface part, and its position must fully satisfy the condition that the acceleration vector points vertically to the charge surface.

The effect of acceleration on the internal ballistic performance of solid rocket motors: The performance of solid rocket motors has changed significantly under acceleration conditions. The average combustion chamber pressure p increased by 36%, the combustion time t decreased by 20%, and other parameters also changed somewhat. There are many reasons for this change, but the leading role is the acceleration sensitivity of the aluminum-containing composite propellant, and the core problem is the acceleration sensitivity of the propellant burning rate. The change of burning rate is the decisive factor for the change of the internal ballistic performance of the solid rocket motor. There are many factors that affect the change of burning rate, such as aluminum powder content, particle size and shape; oxidizer content, particle size and gradation ratio; static burning rate value; acceleration size and the azimuth angle of its vector pointing to the burning surface; combustion chamber pressure; combustion Indoor flow field and nozzle flow field, etc. To analyze this problem scientifically, three tools are needed, namely the pocket model, the particle dynamics model, and the combustion model are interrelated. The pocket model is the premise, which explains the influence of AP on the agglomeration and combustion process of aluminum particles. . The particle dynamics model is the basis of the analysis. It is to study the force state of the condensed aluminum particles under the acceleration field and the conditions required for the particles to fly or stay on the burning surface. The combustion model explores the thermodynamic process of particles staying on the combustion surface.

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