Cycle-resolved residual gas concentration measurement inside a heavy-duty diesel engine using infrared laser absorption

Nobuyuki Kawahara, Eiji Tomita, Atsushi Ohtsuki, Yuzo Aoyagi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Cycle-resolved residual gas fraction measurements were made inside a heavy-duty diesel engine using an infrared absorption method. An in situ laser infrared absorption method was developed using an optical fiber sensor and a 4.301-μm quantum cascade laser (QCL) as the light source. We discuss the feasibility of obtaining in situ CO2 concentration measurements inside the engine combustion chamber using the newly developed optical fiber sensor system. Lambert-Beer's law can be applied for the case of a single absorption line of CO2, and the dependence of the CO2 molar absorption coefficient on the ambient pressure and temperature of was determined using a constant volume vessel. This coefficient decreased with increasing pressure, indicating almost constant at pressures over 1.0 MPa. CO2 concentration measurements were made in a compression-expansion engine in order to calibrate the measurement system. The feasibility of the optical fiber sensor system was then investigated in a heavy-duty diesel engine. We were able to measure the CO2 concentration inside the combustion chamber under various engine load conditions and were able to determine the internal exhaust gas recirculation (EGR) ratio. This measurement technique proved to be valuable in obtaining the cycle-to-cycle CO2 concentration of the residual gas in a heavy-duty diesel engine.

Original languageEnglish
Pages (from-to)2903-2910
Number of pages8
JournalProceedings of the Combustion Institute
Volume33
Issue number2
DOIs
Publication statusPublished - 2011

Fingerprint

diesel engines
Infrared lasers
residual gas
infrared lasers
Diesel engines
Gases
Fiber optic sensors
cycles
engines
optical fibers
Infrared absorption
combustion chambers
Combustion chambers
Engines
infrared absorption
sensors
Beer law
Exhaust gas recirculation
Quantum cascade lasers
exhaust gases

Keywords

  • Heavy-duty diesel engine
  • In situ infrared absorption method
  • Internal EGR ratio
  • Molar absorption coefficient of CO
  • Residual gas concentration

ASJC Scopus subject areas

  • Mechanical Engineering
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Cycle-resolved residual gas concentration measurement inside a heavy-duty diesel engine using infrared laser absorption. / Kawahara, Nobuyuki; Tomita, Eiji; Ohtsuki, Atsushi; Aoyagi, Yuzo.

In: Proceedings of the Combustion Institute, Vol. 33, No. 2, 2011, p. 2903-2910.

Research output: Contribution to journalArticle

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