Unraveling the role of dual Ti/Mg metals on the ignition and combustion behavior of HTPB-boron-based fuel

Debnath, Arijit; Pal, Yash; Mahottamananda, Sri Nithya

doi:10.1016/j.dt.2023.07.005

Cited by 4 publications

(1 citation statement)

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“…In this study, the mass flux ranged from 35 to 78 kg/m 2 s. It was observed that pure HTPB samples consistently exhibited the lowest regression rates, 0.4 to 0.76 mm/s, across all mass flux levels (36.5 to 77.5 kg/ m 2 s). The difference in regression rates observed in this study compared to those reported in reference [35] can be attributed to the use of a different grade of HTPB in this particular investigation. Conversely, the samples with a 10 % B 4 C loading (F4) demonstrated the highest regression rates of 0.71 to 1.25 mm/s in the same oxidizer mass flux range.…”

Section: Regression Rate Evaluationcontrasting

confidence: 73%

Exploring the potential of boron carbide in enhancing energy output of solid fuels for SFRJ and hybrid rocket propulsion systems

Nithya Mahottamananda,

Pal,

Alay Hashim

et al. 2023

Propellants Explo Pyrotec

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Boron carbide (B4C) is known for its exceptional hardness and high energy release during combustion, despite its ignition processes presents considerable challenges. This study focuses on exploring the potential of B4C as an enhancer for the energy output of solid fuels designed for hybrid rocket engines (HRE) or solid fuel ramjets (SFRJ). This study presents the successful incorporation of B4C and fluorinated PTFE (polytetrafluoroethylene) polymer into the HTPB (hydroxyl‐terminated polybutadiene) fuel matrix, aiming to enhance the ignition, combustion, and regression rate performance of solid fuel. Five different fuel compositions were formulated with varying mass ratios of B4C, and their post‐combustion products were characterized using XRD (X‐ray diffraction), HRSEM (high‐resolution scanning electron microscopy), and EDS (energy‐dispersive X‐ray spectroscopy) techniques. The HRSEM‐EDS analysis confirmed a uniform dispersion of B4C/PTFE additives throughout the HTPB matrix. To evaluate the combustion behavior of the B4C/PTFE additives, an opposite flow burner was employed with a gaseous oxygen oxidizer. The F4 fuel sample, loaded with B4C/PTFE (10/20), exhibited an average regression rate increase ranging from 0.61 to 1.15 mm/s when evaluated within the oxidizer flux range of 36–77 kg/m2s, in comparison to that of pure HTPB (0.4 mm/s to 0.76 mm/s). The ignition delay time was investigated as a key parameter affected by the B4C concentration in the solid fuel formulations. Furthermore, a comprehensive combustion mechanism is proposed and discussed for B4C/PTFE loaded in the HTPB matrix under an oxygen environment.

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Section: Regression Rate Evaluationcontrasting

confidence: 73%