LDV measurements of axial distributions of in-cylinder gas velocities

H. Kido, Hiroshi Tajima, A. 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 velocimeters (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 stoke 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. (A)

Original languageEnglish
Pages (from-to)78-84
Number of pages7
JournalJSME International Journal, Series 2: Fluids Engineering, Heat Transfer, Power, Combustion, Thermophysical Properties
Volume32
Issue number1 , Feb., 1989
Publication statusPublished - 1989
Externally publishedYes

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Gas cylinders
Laser Doppler velocimeters
Angular momentum
Combustion chambers
Axial compression
Engine cylinders
Velocity measurement
Flow of gases
Engines

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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abstract = "Characteristics of in-cylinder gas flow in a two-cycle uniflow type engine were investigated by using laser Doppler velocimeters (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 stoke 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. (A)",
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T1 - LDV measurements of axial distributions of in-cylinder gas velocities

AU - Kido, H.

AU - Tajima, Hiroshi

AU - Matsumoto, A.

PY - 1989

Y1 - 1989

N2 - Characteristics of in-cylinder gas flow in a two-cycle uniflow type engine were investigated by using laser Doppler velocimeters (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 stoke 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. (A)

AB - Characteristics of in-cylinder gas flow in a two-cycle uniflow type engine were investigated by using laser Doppler velocimeters (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 stoke 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. (A)

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JO - JSME International Journal, Series B: Fluids and Thermal Engineering

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IS - 1 , Feb., 1989

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