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The Effect of Exhaust System Geometry on Exhaust Dilution and Odor Intensity
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English
Abstract
Diesel exhaust gas dilution and odor intensity were measured in the immediate vicinity of a transit bus equipped with a rear-mounted horizontal exhaust pipe, a rear-mounted vertical exhaust pipe, and a roof-top diffusion system.
Exhaust dilution ratios were measured indoors during vehicle idle operation, using propane added to the exhaust gas as a tracer. Exhaust odor intensities were measured also indoors during vehicle idle operation by a human panel, using a threshold odor measurement technique.
On the average, the dilution of the exhaust gas around the bus with the vertical exhaust pipe was about eight times greater than it was with the horizontal pipe. Odor intensity, as measured by the threshold response distance, was about 35% less with the vertical pipe than with the horizontal pipe. The roof-top diffuser was not as effective as the vertical exhaust pipe in increasing exhaust gas dilution or in reducing exhaust odor intensity.
These results indicate that the exhaust system geometry may have a considerable effect on exhaust odor intensity of diesel-powered vehicles.
Citation
Colucci, J. and Barnes, G., "The Effect of Exhaust System Geometry on Exhaust Dilution and Odor Intensity," SAE Technical Paper 710219, 1971, https://doi.org/10.4271/710219.Also In
References
- Colucci Joseph M. Barnes Gerald J. “Evaluation of Vehicle Exhaust Gas Odor Intensity Using Natural Dilution.” Paper 700105 SAE International Automotive Engineering Congress Detroit January 1970
- Stahman Ralph C. Kittredge George D. Springer Karl J. “Smoke and Odor Control for Diesel-Powered Trucks and Buses.” SAE Transactions 77 1968 paper 680443