Naibo Jiang
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View article: Ballistic Range Experimental Results of Radiating Wakes of Spheres at Mach 10
Ballistic Range Experimental Results of Radiating Wakes of Spheres at Mach 10 Open
Hypersonic flow field can experience significant thermochemical nonequilibrium effects. However, very little ground test data exists for nonequilibrium hypersonic wake flows. Simulating air chemistry in nonequilibrium is highly challenging…
View article: Seedless Velocimetry of High-Enthalpy Hypersonic Boundary Layers by Nitric-oxide Ionization Induced Flow Tagging and Imaging at 100 kHz
Seedless Velocimetry of High-Enthalpy Hypersonic Boundary Layers by Nitric-oxide Ionization Induced Flow Tagging and Imaging at 100 kHz Open
This letter describes the first demonstration of a velocity measurement by Nitric-oxide ionization induced Flow Tagging and Imaging (NiiFTI) of a high-enthalpy hypersonic flow utilizing naturally formed nitric oxide. The measurements were …
View article: Development of broadband high efficiency Mid-IR gratings for high-energy ultrafast lasers
Development of broadband high efficiency Mid-IR gratings for high-energy ultrafast lasers Open
Broadband high-efficiency diffraction gratings play a crucial role in the pulse stretcher and compressor of high-energy ultrafast lasers. Nevertheless, conventional grating manufacturing techniques, including mechanical ruling and holograp…
View article: Analysis of picosecond coherent anti-Stokes Raman spectra for gas-phase diagnostics
Analysis of picosecond coherent anti-Stokes Raman spectra for gas-phase diagnostics Open
We present a hybrid frequency- and time-domain solution, applicable to the case of picosecond coherent anti-Stokes Raman scattering (CARS), for gas-phase diagnostics. A solution has been derived based on both physical arguments and four-wa…
View article: Time-resolved Rayleigh scattering tomography
Time-resolved Rayleigh scattering tomography Open
Tomographic Rayleigh scattering (RS) imaging at a repetition rate of 10 kHz was demonstrated in non-reacting flows employing the second harmonic of a high-energy Nd: YAG burst-mode laser. Sequences of 100 images of the flow mixture fractio…
View article: Emissions in short-gated ns/ps/fs-LIBS for fuel-to-air ratio measurements in methane-air flames
Emissions in short-gated ns/ps/fs-LIBS for fuel-to-air ratio measurements in methane-air flames Open
A study of short-gated 10 nanosecond (ns), 100 picosecond (ps), and 100 femtosecond (fs) laser induced breakdown spectroscopy (LIBS) was conducted for fuel-to-air ratio (FAR) measurements in an atmospheric Hencken flame. The intent of the …
View article: 100 kHz PLEET velocimetry in a Mach-6 Ludwieg tube
100 kHz PLEET velocimetry in a Mach-6 Ludwieg tube Open
Picosecond laser electronic-excitation tagging (PLEET) was demonstrated in a Mach-6 Ludwieg tube at a repetition rate of 100 kHz using a 1064 nm, 100 ps burst-mode laser. The system performance of high-speed velocimetry in unseeded air and…
View article: 100-kHz Interferometric Rayleigh Scattering for multi-parameter flow measurements
100-kHz Interferometric Rayleigh Scattering for multi-parameter flow measurements Open
Simultaneous multi-point multi-parameter flow measurement using Interferometric Rayleigh scattering (IRS) at 100-kHz repetition rate is demonstrated. Using a burst-mode laser and an un-intensified high-speed camera, interferograms are obta…
View article: Rayleigh-scattering-based two-dimensional temperature measurement at 100-kHz frequency in a reacting flow
Rayleigh-scattering-based two-dimensional temperature measurement at 100-kHz frequency in a reacting flow Open
Two-dimensional, Rayleigh-scattering-based temperature measurements utilizing a turbulent jet flame were performed in this study at 100-kHz frequency. This tenfold increase in measurement speed-compared to the 10-kHz frequency considered p…
View article: Pulse-burst laser-based 10 kHz Thomson scattering measurements
Pulse-burst laser-based 10 kHz Thomson scattering measurements Open
Thomson scattering (TS), as a popular and reliable diagnostic technique, has successfully measured electron temperatures and electron number densities of plasmas for many years. Yet, conventional TS techniques using Nd:YAG lasers operate o…
View article: Simultaneous high-speed imaging of temperature, heat-release rate, and multi-species concentrations in turbulent jet flames
Simultaneous high-speed imaging of temperature, heat-release rate, and multi-species concentrations in turbulent jet flames Open
We report the high-speed imaging of multi-species and multi-parameter combustion diagnostics for turbulent non-premixed jet flames using a three-legged burst-mode laser system. Simultaneous OH/CH2O planar laser-induced fluorescence and Ray…
View article: Unseeded velocimetry in nitrogen for high-pressure cryogenic wind tunnels: part II. Picosecond-laser tagging
Unseeded velocimetry in nitrogen for high-pressure cryogenic wind tunnels: part II. Picosecond-laser tagging Open
Picosecond laser electronic excitation tagging (PLEET) is implemented in a large-scale wind tunnel for the first time. High-speed, unseeded velocimetry is performed in the NASA Langley 0.3-m Transonic Cryogenic Tunnel; repetition rates up …
View article: Application of STARFLEET Velocimetry in the NASA Langley 0.3-meter Transonic Cryogenic Tunnel
Application of STARFLEET Velocimetry in the NASA Langley 0.3-meter Transonic Cryogenic Tunnel Open
Selective two-photon absorptive resonance femtosecond laser electronic excitation tagging (STARFLEET) velocimetry is demonstrated for the first time in a NASA Langley wind tunnel with high repetition-rate and single-shot imaging. Experimen…
View article: Fiber-coupled ultrashort-pulse-laser-based electronic-excitation tagging velocimetry
Fiber-coupled ultrashort-pulse-laser-based electronic-excitation tagging velocimetry Open
Transmission of intense ultrashort laser pulses through hollow-core fibers (HCFs) is investigated for molecular-tagging velocimetry. A low-vacuumed HCF beam-delivery system is developed to transmit high-peak-power pulses. Vacuum pressure e…
View article: kHz-rate four-dimensional fluorescence tomography using an ultraviolet-tunable narrowband burst-mode optical parametric oscillator
kHz-rate four-dimensional fluorescence tomography using an ultraviolet-tunable narrowband burst-mode optical parametric oscillator Open
Recent work on four-dimensional (4D) tomographic imaging of reacting and non-reacting flows has utilized fluorescence, incandescence, or scattering from flow tracers, particulates, or aerosols, typically at the harmonics of an Nd:YAG laser…
View article: KHz-rate 4D fluorescence tomography using a UV tunable narrowband burst-mode OPO
KHz-rate 4D fluorescence tomography using a UV tunable narrowband burst-mode OPO Open
Recent work on time-resolved, four-dimensional (4D) tomographic imaging of reacting and nonreacting flows has utilized fluorescence, incandescence, or scattering from flow tracers, particulates, or aerosols, typically at the harmonics of a…
View article: High-speed, three-dimensional tomographic laser-induced incandescence imaging of soot volume fraction in turbulent flames
High-speed, three-dimensional tomographic laser-induced incandescence imaging of soot volume fraction in turbulent flames Open
High-speed, laser-based tomographic imaging of the three-dimensional time evolution of soot volume fraction in turbulent jet diffusion flames is demonstrated to be feasible at rates of 10 kHz or higher. The fundamental output of a burst-mo…
View article: Precision of FLEET Velocimetry using High-Speed CMOS Camera Systems
Precision of FLEET Velocimetry using High-Speed CMOS Camera Systems Open
Femtosecond laser electronic excitation tagging (FLEET) is an optical measurement technique that permits quantitative velocimetry of unseeded air or nitrogen using a single laser and a single camera. In this paper, we seek to determine the…
View article: Application of FLEET Velocimetry in the NASA Langley 0.3-Meter Transonic Cryogenic Tunnel
Application of FLEET Velocimetry in the NASA Langley 0.3-Meter Transonic Cryogenic Tunnel Open
Femtosecond laser electronic excitation and tagging (FLEET) velocimetry is demonstrated in a large-scale transonic cryogenic wind tunnel. Test conditions include total pressures, total temperatures, and Mach numbers ranging from 15 to 58 p…