The turbulence measurement during the intake and compression process for high-turbulence generation around spark timing

Abstract

In-cylinder turbulence of an engine was generated by an intake pressure effect and inertia effect during the intake process and it was generated and decreased by the compression effect of a piston during the compression process. The separate measurement of the turbulence generated by these factors during each process was necessary to generate high turbulence around the spark timing. A single-shot rapid intake compression expansion machine (RICEM) was manufactured and evaluated for this purpose. The RICEM could carry out the intake and compression processes separately or in a row. It was proved that the RICEM simulated not only high temperature and high pressure field but also the same flow pattern as a real engine. The turbulence generated by each factor was measured in the swirl field of the RICEM. As the result, it was also found that enhancing the turbulence by the compression effect of a piston with improvement of the flow at the beginning of the compression process was desirable.

Keywords

rapid intake compression expansion machine hot-wire anemometry ensemble-averaged velocity turbulent intensity turbulence generation rate

Get full access to this article

View all access options for this article.

References

Heywood

J. B.

Fluid motion within the cylinder of internal combustion engine. Trans. ASME, J. Fluid Engng, 1987, 109, 3–35.

Kono

Shiga

Kumagai

Iinuma

Thermodynamics and experimental determination of knock intensity by using a spark ignition rapid compression machine. Combust. Flame, 1983, 54, 33–47.

Fisson

Kageyama

Realization of a rapid compression machine (application to the determination of gaseous pre-mixtures autoignition). In COMODIA 90, 1990, pp. 117–121.

Kido

Wakuri

Marase

Measurements of spatial scales and a model for small-scale structure of turbulence in an internal combustion engine. In ASME-JSME Thermal Engineering Joint Conference, 1983, pp. 20–27.

Parsi

Daneshyar

Measurements of the three-dimensional turbulent flow in the cylinder of an I.C. engine. In Instrumental for Combustion and Flow in Engine, pp. 1231 377–390 (Kluwer, Dordrecht).

Liou

T. M.

Santavicca

D. A.

Cycle resolved turbulence measurements in a ported engine with and without swirl. SAE paper 830419, 1983.

Ikegami

Shioji

Nishimoto

Turbulence intensity and spatial integral scale during compression and expansion strokes in a four cycle reciprocating engine. SAE paper 870372, 1987.

Hamamoto

Tomita

Tanaka

Katayama

Measurement of turbulence of air swirl in a 4-stroke cycle engine cylinder. Jap. Soc. Mech. Engrs, Ser. B, July 1987, 53(491), 2226–2232.

Kim

C. U.

Kim

S. S.

A visualization study on performance of high energy ignition system for LPG lean mixture utilizing RCEM. SAE paper 933850, 1993.

10.

Moriyoshi

Kamimoto

Yagita

Definition of turbulence in-cylinder flow fields. Jap. Soc. Mech. Engrs Int. J., Ser. B, 36(1), 172–177.

11.

Jeong

Y. J.

Joe

K. S.

Kim

W. P.

A study on turbulence flow characteristics at the spark plug location in S.I. engine. Korean Soc. Mech. Engrs, 1994, 18(9), 2423–2430.