Flame temperature measurement of microwave-assisted aluminum particle combustion

Zhu, Keke; Barkley, Stuart J.; Sippel, Travis R.; Michael, James B.

doi:10.2514/6.2019-0834

Cited by 3 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unlike UV, visible, and IR radiation, microwave wavelengths are low energy and capable of penetrating deep into the material volume. Microwave radiation incident on a material can lead to dielectric heating, arc discharge, and ionization of the gaseous species, which in turn can be employed to modulate combustion performance. , Dielectric heating is expected to be the initiator to thermally driven reactions and would occur before gaseous species are released. This dielectric heating is expected to be a primary contributor in overcoming the reaction activation barrier and regulating the ignition event .…”

Section: Introductionmentioning

confidence: 99%

Microwave Stimulation of Energetic Al-Based Nanoparticle Composites for Ignition Modulation

Alibay

Olsen

Biswas

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Although electromagnetic stimulation promises safe and controlled ignition of energetic materials, ultraviolet (UV) to infrared (IR) wavelength sources experience significant photon attenuations in energetic materials. Conversely, radiation in microwave frequencies is recognized for instantaneous volumetric heating capabilities. However, many energetics are poor microwave heaters, and to accelerate the heating, recent efforts focused on adding microwave susceptors that do not participate in the energetic reaction. This is the first effort to demonstrate that nanoscale aluminum (nAl)/manganese oxide (MnO x ) can be rapidly heated at rates ∼104 °C/s under microwave radiation without addition of inert microwave susceptors. Detailed analysis of nanoscale MnO x was performed via X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The samples of MnO x at different loadings of nAl were three-dimensionally (3D) printed into composite films and tested with a microwave applicator at a 2.45 GHz frequency. Infrared thermometry experiments showed that with an increase in MnO x content the heating rate in the samples increases by orders of magnitude. Computational modeling based on the dielectric and thermophysical properties of the materials showed that an electric field is the dominant mechanism accounting for ∼96% of the heating of the nAl/MnO x composites at microwave frequencies. The microwave ignition mechanism was deconvoluted via high-speed IR imaging, in situ time-of-flight mass spectroscopy (TOFMS), temperature-jump (T-jump), and thermogravimetric analysis/differential scanning calorimetry (TGA/DSC) analysis. The results show that microwave stimulation can effectively heat and control ignition in nAl-based thermites with MnO x , where the oxidizer acts dually as a microwave susceptor and an ignition driver.

show abstract

Section: Introductionmentioning

confidence: 99%

Microwave Stimulation of Energetic Al-Based Nanoparticle Composites for Ignition Modulation

Alibay

Olsen

Biswas

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…Also, incorporates a chemical kinetic system of medium complexity between the simplest hydrocarbon flames and hydrogen flames that remains stable. In an experimental and numerical study, Zhu et al [9] described the flame temperature of the combustion of aluminum particles by microwave. The main aim of this study is to boost the burning rate through the microwave.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the effect of ultrasound waves on the turbulent flow with chemical reaction in the combustion chamber

Shateri

jalili

Saffar

et al. 2022

Preprint

View full text Add to dashboard Cite

In the present study, a numerical analysis of turbulent flow in a combustion chamber in 5 milliseconds limited the Reynolds number 16700 by applying a 20 kHz wave from a Bowl-shaped diffusion source over 1 second to process temperature reduction. This study aims to improve the combustion process time and further turbulence of the flow to increase the combustion rate and reduce unburned hydrocarbons in the walls. The k - ω model uses the turbulence–chemistry interaction modeled using the eddy dissipation concept. Two methods have been proposed: relocating the nozzles and applying waves which caused Increasing CO2 combustion from 0.31 to 0.34 by decreasing the distance between nozzles. Also, a spray angle of 45° was introduced as the best angle to reduce the fuel film on the walls and improve combustion. Furthermore, using ultrasound waves, the transfer of flame concentration from the walls to the center of the chamber occurred, which reduced unburnt hydrocarbons on the walls. Wave application improves the flame and creates wrinkles at the edges of the flame, which ultimately leads to a 10% improvement in the performance of the combustion process.

show abstract

“…As an example, AlO and MgO emission spectroscopy, as an indicator of aluminum or magnesium combustion, have been applied to measure gas-phase temperature and ignition dynamics [108,156,122]. In addition, other spectral features including OH in ultra-violet region, or CO 2 and CO in the infrared have also been used to characterize propellant combustion [142,122].…”

Section: Atomic and Molecular Emission Spectroscopymentioning

confidence: 99%

Optical measurements in multiphase combustion

Zhu¹

Self Cite

View full text Add to dashboard Cite

show abstract

Flame temperature measurement of microwave-assisted aluminum particle combustion

Cited by 3 publications

References 29 publications

Microwave Stimulation of Energetic Al-Based Nanoparticle Composites for Ignition Modulation

Microwave Stimulation of Energetic Al-Based Nanoparticle Composites for Ignition Modulation

Numerical study of the effect of ultrasound waves on the turbulent flow with chemical reaction in the combustion chamber

Optical measurements in multiphase combustion

Contact Info

Product

Resources

About