LDV measurements of axial distributions of in-cylinder gas velocities

Hiroyuki Kido, Hiroshi Tajima, Akihiko Matsumoto

Research output: Contribution to journalArticle

Abstract

Characteristics of in-cylinder gas flow in a two-cycle uniflow-type engine were investigated by using laser doppler velocimetry (LDV). Through swirl velocity measurements at several sections along the cylinder axis, it was found that in the early compression stroke, axial distribution of angular momentum is uneven and swirl velocity at each measuring section fluctuates periodically. Mean angular momentum in the whole of the combustion chamber, however, decays monotonously and analysis showed that its decaying process after a late compression stroke is similar to the swirl-decaying process in a cylindrical constant-volume bomb. A secondary airflow in the upper part of the combustion chamber is inferred from the measured radial and axial velocities in an early compression stroke.

Original languageEnglish
Pages (from-to)78-84
Number of pages7
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Volume32
Issue number1
Publication statusPublished - Feb 1989

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Gas cylinders
Angular momentum
Combustion chambers
strokes
Velocity measurement
combustion chambers
Lasers
Axial compression
Engine cylinders
angular momentum
gases
lasers
Flow of gases
Engines
velocity measurement
radial velocity
gas flow
engines
cycles
decay

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry

Cite this

LDV measurements of axial distributions of in-cylinder gas velocities. / Kido, Hiroyuki; Tajima, Hiroshi; Matsumoto, Akihiko.

In: JSME International Journal, Series B: Fluids and Thermal Engineering, Vol. 32, No. 1, 02.1989, p. 78-84.

Research output: Contribution to journalArticle

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