Development of In-cylinder Mixture and Flame Propagation Distribution Measurement Device with Spark Plug Type Sensor

Kimura, Koshiro; Mori, Sachio; Kawauchi, Masato; Shimizu, Rio

doi:10.4271/2011-01-2045

Cited by 2 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The details of the optical diagnostics can be found in our previous paper. 13 The resultant equivalence ratio varying with time within the time window is averaged on the time basis. The eight averaged equivalence ratios thus obtained are further averaged to provide a mean equivalence ratio in the reaction zones traveling from the electrode to eight directions toward the piston top surface.…”

Section: Optical Measurement Of Equivalence Ratio Of Propagating Flammentioning

confidence: 99%

“…In our previous work, the authors developed a novel spark plug–type optical sensor to measure flame propagation and equivalence ratio distribution focusing on the radical luminescence of propagating flame. 13 The equivalence ratio distribution is obtained by analyzing the temporal history of spontaneous emission spectra of CH* and C 2 * (* refers to a radical). Application of this method enables a quantitative analysis of combustion mechanism in cold-start condition in an actual engine.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An investigation for reducing combustion instability under cold-start condition of a direct injection gasoline engine

Kimura

Mori

Kawauchi

et al. 2018

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

In order to meet recent stringent emission regulations, the exhaust catalyst should be heated as early as possible to activate the purifying reactions. In a direct injection spark-ignition engine, a combination of late fuel injection during the compression stroke and late ignition in the expansion stroke is a common strategy to quickly raise exhaust gas temperature for subsequent rapid activation of exhaust catalysts. However, this approach under cold start-up of an engine often results in incomplete and unstable combustion. In this study, to explore the conditions of stable ignition and combustion, the effect of injection timing on indicated mean effective pressure and early combustion duration (MBD0.5) are first investigated by an analysis of the pressure indicator diagram. As this analysis shows a strong correlation between indicated mean effective pressure and MBD0.5, the mechanism of initial flame propagation is investigated intensively using optical diagnostics. Namely, mean equivalence ratio of mixtures in the propagating flame front is measured by focusing on the ratio of C 2 * to CH* emission intensities. The flow velocity and turbulence intensity around the spark electrode are measured by the back-scattering laser Doppler anemometry. Two major conclusions are derived from this study: First, when the injection timing is retarded, the mean equivalence ratio increases as the time for the injected fuel to travel and diffuse is shortened. The most preferable mean equivalence ratio for fast initial combustion is found to lie in a range from 1.2 to 1.4. Second, when the second injection timing is retarded further, the mean equivalence ratio increases exceeding 1.4, and this results in slower and more fluctuated initial flame propagation. But, if the turbulent intensity is increased by means of the spray induced air motion, the slowed initial combustion can be recovered.

show abstract

Section: Optical Measurement Of Equivalence Ratio Of Propagating Flammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An investigation for reducing combustion instability under cold-start condition of a direct injection gasoline engine

Kimura

Mori

Kawauchi

et al. 2018

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

show abstract

Combustion Diagnostics Using Time-Series Analysis of Radical Emissions in a Practical Engine

Kawahara,

Hashimoto,

Tomita

2015

SAE Technical Paper Series

View full text Add to dashboard Cite

<div class="section abstract"><div class="htmlview paragraph">The objective of this study is to investigate the initial flame propagation characteristics of turbulent flame in an engine cylinder through time-series analysis of radical emissions. A spark plug with optical fiber was developed in this study. The plug sensor is M12 type that makes it possible to mount in practical engine. The spark plug sensor can detect radical emissions in time-resolved spectra through time-series spectroscopic measurement. In this spectra, some kinds of radical emissions such as OH*(306nm), CH*(431nm) and C<sub>2</sub>*(517nm) based on principle of chemiluminescence are observed. In this study, the spark plug sensor was applied to both compression-expansion machine (CEM) and practical engine. As a result of CEM with bottom viewed high-speed camera, three kinds of spectra could be detected. At first, after the spark, there were radical emissions of the CH* and C<sub>2</sub>* in case that a spark plug sensor detected the flame front, and then the CO-O recombination emission was observed in the burned gas. As a result of practical engine, an hour durable experiment for spark plug sensor was implemented to confirm its durability by practical engine with high engine speed at wide-opened throttle condition. The cycle-to-cycle variation in lean burn condition was investigated using CH* as a marker of flame front. The history of CH* obtained 5.2kHz time-resolved spectra were compared with the history of mass fraction burned (MFB) analyzed from pressure history. In high engine speed at wide-open throttle condition, intensity ratio of CH* and C<sub>2</sub>* could be evaluated with air/fuel ratio nearby the spark plug.</div></div>

show abstract

Development of In-cylinder Mixture and Flame Propagation Distribution Measurement Device with Spark Plug Type Sensor

Cited by 2 publications

References 13 publications

An investigation for reducing combustion instability under cold-start condition of a direct injection gasoline engine

An investigation for reducing combustion instability under cold-start condition of a direct injection gasoline engine

Combustion Diagnostics Using Time-Series Analysis of Radical Emissions in a Practical Engine

Contact Info

Product

Resources

About