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.
Citation: Johnston, S. and Green, R., "Engine Hydrocarbon Concentration Measurements: A Comparison between a Sampling Probe and Raman Spectroscopy," SAE Technical Paper 820499, 1982, https://doi.org/10.4271/820499. Download Citation
Author(s):
Sheridan C. Johnston, Robert M. Green
Affiliated:
Sandia National Laboratories Livermore, CA
Pages: 16
Event:
SAE International Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1982 Transactions-V91-A
Related Topics:
Hydrocarbons
Lasers
Aerodynamics
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