Scavenging the 2-Stroke Diesel Engine : Effect of Inlet Port-Angle on Scavenging Process of a Through Scavenging System

Ohigashi, Shunichi; Kashiwada, Yukio; Achiwa, Jiro

doi:10.1299/jsme1958.3.130

Cited by 7 publications

(2 citation statements)

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“…It can thus be concluded that the flow in a uniflow-scavenge engine cannot be assumed to be quasisteady, except in the bottom of the cylinder at times when the ports are almost fully open. This conclusion does, to some degree, contradict the findings of earlier investigators, claiming that the scavenging characteristics in uniflow-scavenged engines can be predicted from steady-flow investigations (see e.g., Ohigashi et al 1960;Percival 1955). It is also worth noting that the wellestablished Jante method, used for optimizing the scavenge design, is based on steady-flow investigations (Heywood and Sher 1999).…”

Section: Comparison Of Dynamic and Steady-flow Casementioning

confidence: 60%

Turbulent swirling flow in a dynamic model of a uniflow-scavenged two-stroke engine

et al. 2014

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It is desirable to use computational fluid dynamics for optimization of the in-cylinder processes in low-speed two-stroke uniflow-scavenged marine diesel engines. However, the complex nature of the turbulent swirling in-cylinder flow necessitates experimental data for validation of the used turbulence models. In the present work, the flow in a dynamic scale model of a uniflowscavenged cylinder is investigated experimentally. The model has a transparent cylinder and a moving piston driven by a linear motor. The flow is investigated using phase-locked stereoscopic particle image velocimetry (PIV) and time-resolved laser Doppler anemometry (LDA). Radial profiles of the phase-locked mean and rms velocities are computed from the velocity fields recorded with PIV, and the accuracy of the obtained profiles is demonstrated by comparison with reference LDA measurements. Measurements are carried out at five axial positions for 15 different times during the engine cycle and show the temporal and spatial development of the swirling in-cylinder flow. The tangential velocity profiles in the bottom of Electronic supplementary material The online version of this article (

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Section: Comparison Of Dynamic and Steady-flow Casementioning

confidence: 60%

Turbulent swirling flow in a dynamic model of a uniflow-scavenged two-stroke engine

et al. 2014

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“…Measurements in static models have been performed using a pitot device by Percival (1955), laser Doppler anemometry (LDA) by Sung and Patterson (1982) and Sher et al (1991), and particle image velocimetry (PIV) by Haider et al (2012). Investigations in dynamic models have been performed by, for example, Ohigashi et al (1960) and Nishimoto and Kamimoto (1984) measuring the shape front of scavenging air; Sanborn and Dedeoglu (1988), Dedeoglu (1990), and Litke (1999) with the use of singlecycle liquid models, and LDA measurements in a motored engine with compression by Nakagawa et al (1990). Using a single cylinder test engine with a variable angle swirler, Wakuri et al (1981) carried out fired engine tests to investigate the effect of swirl on fuel consumption and soot production.…”

Section: Introductionmentioning

confidence: 99%

Turbulent swirling flow in a model of a uniflow-scavenged two-stroke engine

et al. 2013

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The turbulent and swirling flow of a uniflowscavenged two-stroke engine cylinder is investigated using a scale model with a static geometry and a transparent cylinder. The swirl is generated by 30 equally spaced ports with angles of 0°, 10°, 20°, and 30°. A detailed characterization of the flow field is performed using stereoscopic particle image velocimetry. Mean fields are calculated using both a fixed coordinate system and a coordinate system based on the instantaneous flow topology. Timeresolved measurements of axial velocity are performed with laser Doppler anemometry, and power spectra are calculated in order to determine vortex core precession frequencies. The results show a very different flow dynamics for cases with weak and strong swirl. In the strongly swirling cases, a vortex breakdown is observed. Downstream of the breakdown, the vortex becomes highly concentrated and the vortex core precesses around the exhaust valve, resulting in an axial suction effect at the vortex center. Mean fields based on the instantaneous flow topology are shown to be more representative than mean fields based on a fixed coordinate system in cases with significant variations in the swirl center location.

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Scavenging the two-stroke engine

Sher

1990

Progress in Energy and Combustion Science

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Scavenging the 2-Stroke Diesel Engine : Effect of Inlet Port-Angle on Scavenging Process of a Through Scavenging System

Cited by 7 publications

References 0 publications

Turbulent swirling flow in a dynamic model of a uniflow-scavenged two-stroke engine

Turbulent swirling flow in a dynamic model of a uniflow-scavenged two-stroke engine

Turbulent swirling flow in a model of a uniflow-scavenged two-stroke engine

Scavenging the two-stroke engine

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