Swirl in a Four-Stroke Cycle Engine Cylinder

Tanabe, Seiichi; Hamamoto, Yoshisuke; Ohigashi, Shunichi

doi:10.1299/jsme1958.21.287

Cited by 12 publications

(1 citation statement)

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“…Previous works have shown that the decay coefficient of angular momentum from IVC to TDC in a reentrant chamber was 32%, 29 25%, 30 and 30% 31 by experiments, respectively. And the data showed that the loss of angular momentum is about 45% 32 for different swirl ratios. Generally, the swirl decay mainly depends on the surface-to-volume ratio ( SV ).…”

Section: Resultsmentioning

confidence: 95%

Prediction of the in-piston-bowl swirl ratio of diesel engines

Sun

Wang

Wen

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Steady flow tests are widely used to evaluate the performance of intake ports in generating swirl flow in diesel engines. Such test data, however, may deviate largely from the real in-piston-bowl swirl ratio due to the complex unsteady air motion in the compression stroke. In this study, a new method is proposed to predict the unsteady in-piston-bowl swirl ratio of diesel engines from steady flow test data by focusing on three key steps, including the swirl field at intake valve close timing, swirl enhancement due to squish flow, and swirl decay during the compression stroke. Experimental results on an optically accessible diesel engine under non-firing conditions show that, at intake valve close, the relationship between the swirl ratio and the vertical location was approximately linear and the mean swirl ratio could be fitted by a Bessel function; the correlation between the swirl decay coefficient and surface-to-volume ratio was built by fitting the experiment data. Furthermore, the in-piston-bowl swirl ratio during the compression stroke could then be derived according to the conservation of angular momentum.

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Section: Resultsmentioning

confidence: 95%

Prediction of the in-piston-bowl swirl ratio of diesel engines

Sun

Wang

Wen

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Measurements of swirling flow in a direct injection diesel engine under motored and fired conditions

Nishida¹,

Murakami²,

Hiroyasu³

1985

Symposium (International) on Combustion

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Influence of Induction Swirl and Piston Configuration on Air Flow in a Four-Stroke Model Engine

Vafidis

1984

Proceedings of the Institution of Mechanical Engineers, Part C:

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Measurements of ensemble-averaged mean, r.m.s. and cycle resolved instantaneous swirl velocities, obtained by laser—Doppler anemometry, are reported for the in-cylinder flow in a four-stroke model engine motored at 200 r/min. Variable induction swirl was created by 30° and 60° vanes located in axisymmetric and off-centre intake ports with flat and re-entrant bowl piston configurations. The results showed that the main features of the initial swirl velocity distribution, which are determined by the intake port/valve geometry, persist through the compression stroke. The swirl centre performed in all cases a helical motion whose development was a function of the clearance volume at top dead centre; the weakness of this motion made it susceptible to cyclic variations which were significantly reduced with the re-entrant piston bowl. High induction swirl resulted in lower turbulence intensity at top dead centre of compression, in the flat piston case, and more complex vortex pattern inside the re-entrant piston bowl. The angular momentum decay from inlet valve closure to top dead centre of compression was shown to depend on initial swirl ratio and velocity distribution and calculated to be about 30 and 45 per cent for the flat and re-entrant bowl piston, respectively.

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Swirl in a Four-Stroke Cycle Engine Cylinder

Cited by 12 publications

References 0 publications

Prediction of the in-piston-bowl swirl ratio of diesel engines

Prediction of the in-piston-bowl swirl ratio of diesel engines

Measurements of swirling flow in a direct injection diesel engine under motored and fired conditions

Influence of Induction Swirl and Piston Configuration on Air Flow in a Four-Stroke Model Engine

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