A5103034351- Fluid Dynamics and Heat Transfer
- Plant Surface Properties and Treatments
- Electrohydrodynamics and Fluid Dynamics
- Advanced Combustion Engine Technologies
- Particle Dynamics in Fluid Flows
- Advanced Sensor Technologies Research
- Fluid Dynamics and Turbulent Flows
- Combustion and flame dynamics
- Combustion and Detonation Processes
- Spectroscopy and Laser Applications
- Biodiesel Production and Applications
- Gas Dynamics and Kinetic Theory
- Fluid Dynamics Simulations and Interactions
- Surface Modification and Superhydrophobicity
- Laser-Matter Interactions and Applications
- Electromagnetic Launch and Propulsion Technology
- Wind and Air Flow Studies
- Atmospheric aerosols and clouds
- Advanced Optical Sensing Technologies
- Mass Spectrometry Techniques and Applications
- Advanced Fiber Laser Technologies
- Heat Transfer Mechanisms
- Laser Design and Applications
- Advanced Measurement and Detection Methods
Langley Research Center
2024-2025
Purdue University West Lafayette
2014-2021
The spray characteristics of standard and alternative aviation fuels created by a hybrid pressure-swirl airblast (HPSA) atomizer were investigated at conditions corresponding to engine cold start for an gas turbine. Drop size drop velocity sprays from three different fuels, Jet-A (A-2), JP-5 (A-3), JP-5/farnesane blend (C-3) using phase Doppler anemometry. spatially resolved measurements obtained axial locations downstream the swirler exit plane up 30 mm in radial direction centerline....
Filtered Rayleigh scattering (FRS) is a diagnostic technique used for measurements of macroscopic properties gas. The FRS signal passed through narrow bandwidth molecular filter, commonly gaseous iodine, to measure the broadening and Doppler-shift light from molecules gas flow. However, in single-frequency, intensity-based approaches, effects pressure, temperature, velocity can be difficult deconvolve. To overcome this challenge, frequency-scanning has been quasi-spectrally resolve signal....
Phase Doppler anemometry is used to experimentally measure and compare the drop size velocity of two gel propellant simulants – 1.0 wt.-% Agar Kappa Carrageenan with deionized water. A parametric study conducted observe influence geometry on characteristics. like-on-like impinging jet doublet varying impingement angles, free length-to-orifice diameter ratios, internal lengthto-orifice ratios. The angle ratio are not observed show strong characteristics correlations. Increasing produce larger...
The spatially resolved spray characteristics created by the like-on-like impingement of two gelled propellant simulants was experimentally investigated using Phase Doppler Anemometry (PDA). Water based gels 1.0 wt.-% agar and kappa carrageenan, which were characterized Herschel-Bulkley rheological model, used as gel simulants. Spatially measurements for drop size velocity obtained up to 10 mm away from centerline along transverse axis in plane sheet 20 normal sheet. All at an axial 5 cm...
The impinging jet spray formation of viscoelastic liquids was experimentally studied using water-based solutions xanthan gum at three different concentrations (0.1 wt.-%, 0.5 and 4.0 wt.-%). Unique patterns were observed depending on the generalized Bird-Carreau Reynolds number, Weber Weissenberg number. maximum instability wavelength sheet breakup lengths extracted from shadowgraphs. Drop only for 0.1 wt.-% solution Phase Doppler Anemometry used to measure means distribution drop diameter...
This work investigates the feasibility and performance of an ultra-narrowband a rapidly wavelength-tunable burst-mode filtered Rayleigh scattering (FRS) system for single- or multi-parameter measurements density, pressure, temperature, velocity in high-speed flows.
Long-lived NO fluorescence with a lifetime of several microseconds is demonstrated for MTV using an efficient 1+1 resonant-enhanced-multiphoton-ionization (REMPI) process. This measurement technology particularly applicable to high-speed flows under wide pressure range.
Aerodynamic fragmentation of bulk liquid into small droplets is an essential spray process that occurs in a variety combustion systems. The aerodynamic breakup non-Newtonian fluids, such as aerospace propellants, bio-fuels, fire-fighting liquids, thermal barrier coatings, water-gel explosives, paints, etc, involved many important applications. Non-Newtonian fluids differ from Newtonian they do not exhibit linear shear stress-strain rate relationship. They are employed when the desirable to...
The primary atomization of a viscoelastic liquid was experimentally investigated using water-based solution 0.1 wt.-% xanthan gum (XG). Shadowgraphy images were obtained to qualitatively study the impinging jet spray formation and Phase Doppler Anemometry (PDA) used measure drop diameters velocities. behavior observed hinder when effect inertial force relatively insignificant. However, increasing led patterns transitioning towards ligament structures fully developed patterns. D10, D32, MMD...