MEASUREMENT OF TURBULENCE OF AIR SWIRL IN A 4-STROKE CYCLE ENGINE CYLINDER.

Yoshisuke Hamamoto, Eiji Tomita, Hiroyoshi Miwa

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The turbulence of air swirl in the cylinder of a motored engine with a shrouded intake valve was measured with a hot-wire anemometer. In order to determine the turbulence characteristics such as turbulence intensity, integral time scale, etc. , the flow velocity data were analyzed by the 'stationary time average method' during a time interval of compression TDC plus or minus DELTA t/2. By changing the time interval DELTA t, different values of turbulence characteristics were obtained. It was made clear that the use of a finite time interval DELTA t meant the use of a high pass filter with a cut-off frequency of about 1/(2 DELTA t). As the angular speed of swirl increased, the turbulence intensity increased and the integral time scale and the micro time scale decreased. Different correlations between turbulence intensity and angular speed of swirl were obtained in different intake valves.

Original languageEnglish
Pages (from-to)2226-2232
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume53
Issue number491
Publication statusPublished - Jul 1987
Externally publishedYes

Fingerprint

Engine cylinders
strokes
engines
Turbulence
turbulence
cycles
air
Air
Intake valves
intervals
High pass filters
hot-wire anemometers
high pass filters
Anemometers
Cutoff frequency
Flow velocity
Wire
Engines
cut-off
flow velocity

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

MEASUREMENT OF TURBULENCE OF AIR SWIRL IN A 4-STROKE CYCLE ENGINE CYLINDER. / Hamamoto, Yoshisuke; Tomita, Eiji; Miwa, Hiroyoshi.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 53, No. 491, 07.1987, p. 2226-2232.

Research output: Contribution to journalArticle

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