Combustion Characterization of Amine Borane Hypergolic Propellants

Willits, Jared D.; Dennis, Jacob D.; Kulkarni, Ameya; Ramachandran, P. Veeraraghavan; Pourpoint, Timothée L.

doi:10.2514/6.2014-3884

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…12 Although the density of TEAB is lower than that of MMH by 12%, the density-I sp (I sp ) of TEAB/WFNA is within 2% of MMH/RFNA because the stoichiometric oxidizer to fuel mass ratio is higher for TEAB. 11 Table 1 compares the performance of these propellant combinations. …”

Section: B Triethylamine Boranementioning

confidence: 99%

“…They also showed that the combustion efficiency of TEAB/WFNA is nearly equivalent to MMH/RFNA with similar injection parameters in an impinging jet system. 11 According to the MSDS, liquid TEAB has a density of 777 kg/m 3 , a freezing point of -4°C, and a boiling point of 97°C. 12 Although the density of TEAB is lower than that of MMH by 12%, the density-I sp (I sp ) of TEAB/WFNA is within 2% of MMH/RFNA because the stoichiometric oxidizer to fuel mass ratio is higher for TEAB.…”

Section: B Triethylamine Boranementioning

confidence: 99%

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Effect of Water and Humidity on Hypergolic Propellant Ignition Delay

Zarbo¹,

Belal²,

Pourpoint³

2015

51st AIAA/SAE/ASEE Joint Propulsion Conference

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Triethylamine borane (TEAB) and white fuming nitric acid (WFNA) is a promising hypergolic propellant combination being studied as an alternative to monomethyl hydrazine (MMH) and red fuming nitric acid (RFNA). Nitric acid and MMH are both known to be hygroscopic and their performance is affected by their water content. However, the effect of water on TEAB is yet to be determined. The goal of this research is to characterize the major consequences of water presence on the ignition and combustion performance of TEAB and to compare those results to MMH. TEAB samples are put through accelerated aging in humid and dry environments. Along with the aged TEAB, neat TEAB and neat MMH are used in drop on pool tests with WFNA. The drop tests are conducted by controlling the relative humidity to either below 25% or above 90% and the water concentration in WFNA to either 0% or 10% by weight. Ignition and combustion events are recorded using a photodiode, a microphone, a high speed camera, and a UV streak camera spectrometer. Statistical analysis is applied to the data to determine significant parameters and trends. While relative humidity does not appear to affect the combustion of TEAB with WFNA, water concentration in the oxidizer significantly weakens it. Relative humidity improves MMH ignition delay time and water concentration shows no effect. Nomenclature c* = characteristic velocity IDT = ignition delay time I sp = specific impulse MMH = monomethylhydrazine NTO = dinitrogen tetroxide PTFE = polytetrafluoroethylene RFNA = red fuming nitric acid RH = relative humidity TEAB = triethylamine borane WFNA = white fuming nitric acid = expansion area ratio  = density

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Section: B Triethylamine Boranementioning

confidence: 99%

Section: B Triethylamine Boranementioning

confidence: 99%