Advanced Combustion Technologies for Higher Thermal Efficiency

Tomita, Eiji; Kawahara, Nobuyuki; Azimov, Ulugbek

doi:10.1007/978-3-030-94538-1_4

Cited by 2 publications

(1 citation statement)

References 129 publications

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“…High thermal efficiency, reduced fuel consumption, and low exhaust emissions are vital goals in automotive powertrain development concerning gasoline engines [1][2][3]. The dilution of the air-fuel mixture and high EGR rate have long been considered effective methods, but the cyclic variation in combustion increases for ultra-lean and high EGR rate conditions.…”

Section: Introductionmentioning

confidence: 99%

The Interaction between In-Cylinder Turbulent Flow and Flame Front Propagation in an Optical SI Engine Measured by High-Speed PIV

Ikeda¹

2022

Energies

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The relationship between the flow field and flame propagation is essential in determining the dynamics and effects of turbulent flow in an optical SI engine. In this study, high turbulence flow at stable operations was achieved using 12,000 rpm engine speed, 60 kPa absolute intake pressure, 14.7 A/F, and 15 deg. BTDC spark timing. The turbulent flow field and flame propagation interplay were analyzed through the simultaneous high-speed PIV measurements of the in-cylinder flow and flame front propagation under firing conditions. The intensity of the seeder used was optimized by changing the crank angle. Successful simultaneous detection of the flame front and turbulent flow was demonstrated. Strong turbulence was produced at the flame front simultaneously with the flame movement. After ignition timing, the flame accelerated in the unburned region, and a vital turbulence region occurred.

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Section: Introductionmentioning

confidence: 99%

The Interaction between In-Cylinder Turbulent Flow and Flame Front Propagation in an Optical SI Engine Measured by High-Speed PIV

Ikeda¹

2022

Energies

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Schlieren imaging and spectroscopic approximation of the rotational–vibrational temperatures of a microwave discharge igniter with a resonating cavity

Ikeda¹,

Ofosu

2022

Appl. Opt.

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A microwave discharge igniter (MDI) with a resonating cavity was developed and optimized for practical applications in an internal combustion engine. In contrast to the typical microwave ignition, the resonating cavity of the MDI induces a discharge through dielectric resonance. Its source of microwave (MW) is a 2.45 GHz semiconductor oscillator that is capable of numerous oscillation patterns. To verify and demonstrate the optimum ignition performance and combustion, we varied the oscillation parameters (signal factors) of the MW to optimize the performance of the MDI using the Taguchi method. Plasma spectroscopy was used for ignition condition analysis. Two sets of microwave pulses, a first pulse followed by a second set of pulse bursts, were used to ignite a propane–air fuel. The flame kernel growth rate and O I species generation were used as the response outputs, which were obtained, respectively from Schlieren imaging and emission spectroscopy experiments. The extended pulse periods and higher MW pulse numbers of the second set of pulses improved the response outputs of the MDI. To further analyze the effect of MW oscillation patterns on plasma properties and performance, measurements were done on MW superimposed operation with the high-voltage ignition from spark plugs. The MW transmission on a typical spark plug enhanced the air plasma ignition. Higher input MW energy and more extended MW pulse widths results in increased spectral intensity and radical generation of OH, O, and N 2 . An inverse relation between the temperature and spectral intensity functions of the MW pulse width was observed, which was attributed to the cutoff density of the MW-enhanced plasma.

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Advanced Combustion Technologies for Higher Thermal Efficiency

Cited by 2 publications

References 129 publications

The Interaction between In-Cylinder Turbulent Flow and Flame Front Propagation in an Optical SI Engine Measured by High-Speed PIV

The Interaction between In-Cylinder Turbulent Flow and Flame Front Propagation in an Optical SI Engine Measured by High-Speed PIV

Schlieren imaging and spectroscopic approximation of the rotational–vibrational temperatures of a microwave discharge igniter with a resonating cavity

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