Engine Hydrocarbon Concentration Measurements: A Comparison between a Sampling Probe and Raman Spectroscopy 820499

An experiment designed to quantify probe-induced aerodynamic perturbations to in-cylinder sampling measurements in a motored engine is discussed. Good agreement was observed between concentration measurements obtained with a sampling probe utilizing a flame ionization detector and those obtained by laser Raman scattering at the probe tip. However, large differences were found between the Raman-measured concentration profiles obtained with and without the probe installed in the engine. These differences occurred because of probe-induced perturbations to the in-cylinder air motion which decreased the mean velocity and increased local mixing rates. Effects due to probe orientation in the flow, probe insertion depth, probe inflow, and far-field flow perturbations are reported.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.