Instantaneous temperature measurement in a rapid-compression machine using laser Rayleigh scattering
The instantaneous local temperature is measured in a rapid compression machine (RCM) after the compression. The technique used was the laser Raleigh scattering at 532 nm. Despite the important background noise due to the very confined RCM chamber, optimum optical conditions lead to a single-shot temperature accuracy of 30 K at the end of compression. The temperature history is sampled at the laser pulse rate, and it exhibits large temperature fluctuations just after the end of compression. Comparison with the extensively used calculated adiabatic core gas temperature shows excellent agreement, at least in the time interval corresponding to ignition delays (below 100 ms). This first experimental assessment of core gas assumption is important for chemical kinetics numerical predictions in RCMs.
Bibliographic Reference: Article: Applied Physics B, Vol. 61 (1995) pp. 69-72
Record Number: 199512100 / Last updated on: 1996-01-15
Original language: en
Available languages: en