Zezhong WANG, Xin LIN, Xilong YU

DOI Number: N/A

Conference number: HiSST-2025-077

A hybrid gas generator (HGG) with a paraffin-based fuel grain is a high-performing gas supply alternative for rocket-based ramjet applications. Aiming to provide stable and adequate fuel-rich gas, the combustion mode of HGG was explored through theoretical analysis. The end-burning coupled with swirling injection was selected to maximize the regression rate of the fuel grain while minimizing the O/F ratio and combustion temperature. Firing tests were conducted to evaluate HGG’s combustion characteristics. The performance of solid fuels with different components was compared. The PE fuel grain was tested and served as the baseline. The HGG exhibited rapid ignition and pure paraffin fuel grains demonstrated a high regression rate, linearly related to oxidizer flux, proving well-suited for HGG. Adding binders and aluminum powders significantly decreased the regression rate, which also leads to a notable rise in combustion temperature. Excess aluminum drastically lowers the regression rate and sharply raises the O/F ratio.

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In Categories: 1.Events, 1.HiSST 2025, Propulsion Systems & Components
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