20 kHz toluene planar laser-induced fluorescence imaging of a jet in nearly sonic crossflow

Near-kHz 3D tracer-based LIF imaging of a co-flow jet using toluene

“…A Schott glass 2 mm thick WG280 long-pass filter is placed in front of the camera to block the majority of scattered 266 nm light; the filter transmission is roughly 1% at 266 nm, 86% at 300 nm, and greater than 99% from 300 nm to 2 μm. The phosphor in the intensifier has a relatively slow decay, and significant residual signal, roughly 4%, is observed in the first subsequent image at an acquisition rate of 15 kHz and is corrected for using the procedure outlined by Hoess and Fleder [17] and detailed in [18]. At least two versions of the P46 (green) are available in this particular intensifier, a 'fast' P46 phosphor, which decays to 0.2% of the previous image at 50 kHz acquisition rate compared to the slow P46 which is 6.1% at 50 kHz.…”

Investigation of dynamic mixedness characteristics of a transverse acoustically excited turbulent jet by high-repetition-rate acetone tracer planar laser-induced fluorescence technique

“…Sjöholm et al 2013). More recently, the emergence of high-speed lasers (i.e., diode-pumped solid state and "burst" lasers) and high-frame-rate cameras recently has facilitated the possibilities of kHz-rate tracer LIF measurements (McManus et al 2015;Miller et al 2014). Given that the output energy from commercial high-speed lasers is somewhat low, high-speed (two-stage) image intensi ers become necessary in many situations to boost the signal for low-light applications.…”

Oxygen Concentration Distribution Measurement of the Nozzle Flow Field by Toluene/Acetone Planar Laser-Induced Fluorescence

“…In the development of internal combustion engine, the equivalent ratio distribution, temperature distribution, flame combustion area, and other flow field information in the engine combustion chamber have great significance for engine design and development [11][12][13][14]. PLIF technology can accurately measure the component concentration distribution, temperature variation, combustion area, and other flow field information inside the engine, and show the variation trend of these parameters in space and time [15,16]. Based on these data information, the combustion process inside the engine can be further obtained, and it gives the basis for the engine structure modification and optimization design.…”