Prediction of Swirl Velocity of In-Cylinder Flow of an Engine by a Simplified Simulation Model (4th Report, Evaluation of Valve Timing)

Hidenori Tasaka, Hiroshi Tajima, Yoshinori Nagase

Research output: Contribution to journalArticle

Abstract

Improving combustion of the spark ignition engines contributes largely to decreasing fuel consumption, especially under the conditions of medium or low speed and low load. In this paper, valve timing is evaluated from the viewpoints of swirl velocity as well as the volumetric efficiency, burned gas fraction in a fresh mixture charge, and pumping loss at intake stroke by using the predictions of the simplified simulation model. As a result, the timing of intake valve opening and closing is considerably affected by the swirl velocity. It is also confirmed that the mean swirl velocity controlled by the valve timing is higher than that controlled by the conventional throttling system under the same volumetric efficiency condition.

Original languageEnglish
Pages (from-to)2090-2093
Number of pages4
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume59
Issue number562
DOIs
Publication statusPublished - Jan 1 1993
Externally publishedYes

Fingerprint

Engine cylinders
engines
volumetric efficiency
time measurement
Engines
evaluation
predictions
Intake valves
simulation
throttling
Internal combustion engines
spark ignition
Fuel consumption
fuel consumption
closing
strokes
low speed
pumping
Gases
gases

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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title = "Prediction of Swirl Velocity of In-Cylinder Flow of an Engine by a Simplified Simulation Model (4th Report, Evaluation of Valve Timing)",
abstract = "Improving combustion of the spark ignition engines contributes largely to decreasing fuel consumption, especially under the conditions of medium or low speed and low load. In this paper, valve timing is evaluated from the viewpoints of swirl velocity as well as the volumetric efficiency, burned gas fraction in a fresh mixture charge, and pumping loss at intake stroke by using the predictions of the simplified simulation model. As a result, the timing of intake valve opening and closing is considerably affected by the swirl velocity. It is also confirmed that the mean swirl velocity controlled by the valve timing is higher than that controlled by the conventional throttling system under the same volumetric efficiency condition.",
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T1 - Prediction of Swirl Velocity of In-Cylinder Flow of an Engine by a Simplified Simulation Model (4th Report, Evaluation of Valve Timing)

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AU - Tajima, Hiroshi

AU - Nagase, Yoshinori

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N2 - Improving combustion of the spark ignition engines contributes largely to decreasing fuel consumption, especially under the conditions of medium or low speed and low load. In this paper, valve timing is evaluated from the viewpoints of swirl velocity as well as the volumetric efficiency, burned gas fraction in a fresh mixture charge, and pumping loss at intake stroke by using the predictions of the simplified simulation model. As a result, the timing of intake valve opening and closing is considerably affected by the swirl velocity. It is also confirmed that the mean swirl velocity controlled by the valve timing is higher than that controlled by the conventional throttling system under the same volumetric efficiency condition.

AB - Improving combustion of the spark ignition engines contributes largely to decreasing fuel consumption, especially under the conditions of medium or low speed and low load. In this paper, valve timing is evaluated from the viewpoints of swirl velocity as well as the volumetric efficiency, burned gas fraction in a fresh mixture charge, and pumping loss at intake stroke by using the predictions of the simplified simulation model. As a result, the timing of intake valve opening and closing is considerably affected by the swirl velocity. It is also confirmed that the mean swirl velocity controlled by the valve timing is higher than that controlled by the conventional throttling system under the same volumetric efficiency condition.

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