Single camera high repetition rate two-color formaldehyde planar laser-induced fluorescence thermometry with a wavelength-switching burst mode laser

TL;DR

This paper presents a high-repetition rate two-color formaldehyde PLIF thermometry technique using a wavelength-switching laser, enabling rapid temperature measurements in combustion zones with a single camera.

Contribution

It introduces a novel wavelength-switching burst mode laser system for high-speed, two-color formaldehyde PLIF thermometry with a single camera setup.

Findings

Validated on laminar coflow diffusion flame

Demonstrated on turbulent confined jet in hot crossflow

Achieved 20 kHz high-repetition rate temperature measurements

Abstract

We consider a two-color formaldehyde PLIF thermometry scheme using a wavelength-switching injection seeding Nd:YAG laser at 355 nm. The 28183.5 cm-1 and 28184.5 cm-1 peaks of formaldehyde are used to measure low temperature combustion zone. Using a burst mode amplifier and a high speed camera, high-repetition rate (20 kHz) temperature field measurement is validated on a laminar coflow diffusion flame and demonstrated on a turbulent confined jet in hot crossflow flame.