Yeongho SHIN, Eunji JUN

DOI Number: N/A

Conference number: HiSST-2024-307

Solid rocket motors (SRMs) are widely used in military and space sectors for their cost-effectiveness and compactness. The design optimization of SRMs, however, introduces unique challenges despite their simple structure relative to liquid-propellant rockets. A primary concern is the emission of micron-sized alumina particles in the exhaust flow. These particles make up nearly 30% of the total mass flow, considerably affecting the flow properties. At high altitudes, the exhaust flow underexpands in the rarefied atmosphere, posing potential risks such as base heating, erosion, and contamination. Understanding the exhaust flow dynamics can lead to more efficient SRM designs, potentially improving fuel efficiency and reducing operational risks. This study presents the numerical analysis of SRM plume at high altitudes. SRM exhaust flow conditions are derived from prior research, while the ambient conditions are obtained from NRLMSISE atmosphere model. The current study employs the Direct Simulation Monte Carlo (DSMC) method, which predicts rarefied gas flows by tracking the collision and movement of gas molecules. Within the open-source DSMC software, SPARTA, developed by Sandia National Laboratories, gas-solid interaction model is validated and incorporated to represent interphase dynamics. The results provide insights into the impact of alumina particles on the exhaust flow and the plume distribution near the SRM.

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In Categories: 1.Events, High-Speed Aerodynamics and Aerothermodynamics, HiSST 2024
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