Laboratory-Scale Burning of Composite Solid Propellant for Studying Novel Nanoparticle Synthesis Methods

Allen, Tyler; Demko, Andrew R.; Johnson, Mitch; Sammet, Thomas; Petersen, Eric L.; Reid, David L.; Draper, Robert; Seal, Sudipta

doi:10.2514/6.2013-821

Cited by 17 publications

(16 citation statements)

References 10 publications

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“…8 This same sol-gel synthesis method used to produce the in-situ titania was applied to the synthesis of in-situ iron-oxide (Fe 2 O 3 ). The production of in-situ iron-oxide at approximately 20 nm is new and more details will follow in a later publication.…”

Section: Methodsmentioning

confidence: 99%

Ignition Delay Times of Composite Solid Propellants Using Novel Nano-Additive Catalysts

Demko¹,

Dillier²,

Petersen³

et al. 2015

51st AIAA/SAE/ASEE Joint Propulsion Conference

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Ignition delay time measurements on solid energetic materials lead to better fundamental understanding of the ignition process and provide benchmark data for improving models of the ignition process. Validation for such models is typically done by collecting ignition data over a wide range of propellant formulations. This study focused on the development of a setup to obtain ignition delay times of AP/HTPB-based composite solid propellants with and without aluminum and with and without various metal-oxide nanoparticle catalysts. A CO 2 laser with a wavelength of 10.6 μm was utilized to achieve a quantifiable and reliable ignition event over a power range of 30 to 100 W. AP and HTPB propellants have been shown to have high absorption and low reflection at this 10.6-μm wavelength. Resulting from this study was the development of a method to measure the ignition delay time for ammonium perchlorate composite propellants (APCP) at elevated pressures between 3.5 and 15.5 MPa. A comparison of the laser power flux as it relates to the change in ignition delay time was found to match available literature values at similar conditions. Additional studies to examine the effects of in-situ titania nanoparticles on the ignition delay times demonstrated that the nano-additives only appeared to alter the ignition behavior of the aluminized APCP.When iron-oxide was added, the ignition delay time was reduced at lower pressures. Additives which aid in the low-temperature decomposition of AP are believed to impact the ignition delay times the most. Nomenclature a = burning rate constant (also called temperature coefficient) n = pressure coefficient in burning rate relation P = pressure r = burning rate T = temperature σ p = propellant temperature sensitivity

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Section: Methodsmentioning

confidence: 99%

Ignition Delay Times of Composite Solid Propellants Using Novel Nano-Additive Catalysts

Demko¹,

Dillier²,

Petersen³

et al. 2015

51st AIAA/SAE/ASEE Joint Propulsion Conference

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“…The continuous involvement of the teacher participant over several years has led to his direct and significant contributions toward several conference and journal papers. 6,[12][13][14][15][16] …”

Section: Research Experiences For Teachers Portionmentioning

confidence: 98%

“…Examples include the journal paper of Krejci et al; 5 the AIAA conference paper of Allen et al; 6 the journal and conference papers of Polley et al; [7][8][9] and the conference papers of Warren et al 10 and Demko et al 11…”

Section: Year-round Programmentioning

confidence: 99%

Texas Center for Undergraduate Research in Energy and Propulsion: An NSF REU Site at Texas A&M University

Eric¹,

Thomas²,

Ranjan³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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Since 2010, a Research Experiences for Undergraduates (REU) site focusing on energy-, propulsion-, and combustion-related research topics has been held at Texas A&M University (TAMU). A major focus of the site has been the recruitment of undergraduate participants from schools within the state of Texas that do not have major research programs in engineering. To this end, 85% of the 10-week, summer participants have fallen within this category. Four main summer sites have been held to date, involving 40 total participants. Of these students, at least 63% of them were also from underrepresented groups within the STEM fields (female, Hispanic, Black, and Native Americans). Other aspects of the REU site include the participation of one high school teacher each year and a year-round research program that involves 2 students from TAMU as well as 2 students from one of two different partner universities representing non-Tier-One research institutions in Texas, namely the University of North Texas and the University of Texas at Brownsville. Highlights on the overall program, a summary of the research projects and mentors, and details from the last four years of the REU site are provided in this paper.

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“…Recent propellant studies have involved the effect of nano-additives to tailor burning rate characteristics [4][5][6][7][8][9][10]. With new formulations and novel nano-particle manufacturing techniques specific to propellants, examining the aging characteristics of the resulting composite is of interest.…”

Section: Introductionmentioning

confidence: 99%

Aging Effects of Composite AP/HTPB Propellants Containing Nano-Sized Additives

Sammet¹,

Demko²,

Dillier³

et al. 2015

51st AIAA/SAE/ASEE Joint Propulsion Conference

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The aging behavior of a composite propellant is a key indicator in the service life of a practical rocket motor. Advancements in the development of nano-particle additives and their burning rate enhancing characteristics give rise to examining the long-term impacts on the service life of the motor. Recent research at Texas A&M has focused on tailoring ballistic characteristics through the addition of nano-additives specifically synthesized for composite propellants. This paper focuses on an AP/HTPB propellant with a dry-powder nano-titania additive to influence ballistic characteristics and fluorescing Lumidots to assess morphological changes associated with accelerated aging. Sample sets were aged at 85 o C in ambient humidity conditions for six and twelve days, simulating four and eight years of aging, respectively. Data were correlated to a set of naturally aged samples. Acceleratedaged monomodal AP formulations with 80% solids loading and nano-additive demonstrated an approximate 7% decrease in burning rate, with accompanying morophological changes. Accelerated-aged bimodal AP forumlations with 85% solids loading and nano-additive demonstrated an approximate 12% increase in burning rates, with accompanying morphological changes. Nomenclature a = burning rate constant (also called temperature coefficient) n = pressure coefficient in burning rate relation P = pressure r = burning rate

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Laboratory-Scale Burning of Composite Solid Propellant for Studying Novel Nanoparticle Synthesis Methods

Cited by 17 publications

References 10 publications

Ignition Delay Times of Composite Solid Propellants Using Novel Nano-Additive Catalysts

Ignition Delay Times of Composite Solid Propellants Using Novel Nano-Additive Catalysts

Texas Center for Undergraduate Research in Energy and Propulsion: An NSF REU Site at Texas A&M University

Aging Effects of Composite AP/HTPB Propellants Containing Nano-Sized Additives

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