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Your search keyword '"Konno, Mitsuru"' showing total 7 results
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7 results on '"Konno, Mitsuru"'

6. Measurement of ethylene in combustion exhaust using a 3.3-μm distributed feedback interband cascade laser with wavelength modulation spectroscopy.

Author

Tanaka, Kotaro, Akishima, Kazushi, Sekita, Masahiro, Tonokura, Kenichi, and Konno, Mitsuru

Subjects
ABSORPTION spectra, ETHYLENE, COMBUSTION, MODULATION spectroscopy, LASER beams, SIGNAL-to-noise ratio
Abstract

A sensor for the detection of ethylene (CH) in combustion exhaust based on a mid-infrared wavelength modulation spectroscopic technique was constructed using a distributed feedback interband cascade laser (DFB-ICL) with a wavelength of 3.3 μm. The direct absorption spectrum of CH in the range of 2978.8-2982.1 cm was recorded, where the spectrum was in good agreement with the spectrum simulated using parameters from the HITRAN 2012 database. The absorption line at 2979.581 cm [2.42 × 10 cm mol cm, ν P(5)] was selected for CH detection. This frequency was chosen to minimize spectral interference from other major combustion products in the emission frequency range of the DFB-ICL. A limit of detection for CH of 96 parts per billion by volume was achieved at a signal-to-noise ratio of two under 3 kPa of pressure using 2 f wavelength modulation spectroscopy. Using the developed sensor, the ethylene concentration in the exhaust from a portable power generator was also successfully determined. [ABSTRACT FROM AUTHOR]

Published
2017
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7. How to Put the HCCI Engine to Practical Use: Control the Ignition Timing by Compression Ratio and Increase the Power Output by Supercharge

Author

Zhili Chen and Konno Mitsuru

Subjects
Engineering, business.industry, Homogeneous charge compression ignition, Combustion, Supercharger, Automotive engineering, law.invention, Ignition system, Integrated engine pressure ratio, Carbureted compression ignition model engine, law, Compression ratio, Ignition timing, business
Abstract

In this study, compression ratio for controlling ignition and combustion for HCCI engine is proposed. Compression ratio can be changed higher for leaner mixture or lower for richer mixture to prevent misfire and rapid combustion respectively. In order to increase the power rate of the HCCI engine to a practical use level, supercharge can be combined with various compression ratio. To ascertain the efficacy on ignition and combustion, a series of bench tests and combustion simulations with constant pressure were conducted. The testing result shows that compression ratio is very useful for HCCI control: the engine can run over a wider load range of equivalent ratio without misfire or rapid combustion, and the power rate is comparable to a Dl (Direct Injection) engine when a supercharger is installed. The findings from the combustion simulation are: progress (or degeneration) of low temperature oxidation is highly dependent on pressure but pressure does not affect the reaction rate of high temperature oxidation.

Published
2003

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