Micro PIV investigation of near wall behaviors of tumble enhanced flow in an IC engine

Masayasu Shimura, Shingo Yoshida, Yuki Minamoto, Takeshi Yokomori, Kaoru Iwamoto, Mamoru Tanahashi, Hidenori Kosaka

研究成果: Paper査読

2 被引用数 (Scopus)

抄録

To develop higher energy-efficiency and lower emission internal combustion (IC) engines, it is important to understand heat loss characteristics and flame-wall interactions since heat transfer through the wall during combustion greatly affects the energy-efficiency and combustion products. Heat loss from the wall depends significantly on velocity boundary layer of IC engine, which has not been fully understood yet. In this study, a micro particle image velocimetry (PIV) has been performed to investigate tumble enhanced flow characteristics near piston top surface of a motored IC engine for three inlet valve timing (-30, -15, 0 crank angle degrees (CAD)). PIV was conducted at 340, 350 and 360 CAD of the end of the compression stroke at the constant motored speed of 2000 rpm. The measurement region is 3.2 mm × 1.5 mm on the piston top including central axis of the cylinder. The spatial resolution of PIV defined by the interrogation region is about 75 micrometers and the vector spacing is about 37.5 micrometers. The first velocity vector is located about 60 micrometers from the piston top surface. The high spatial resolution PIV revealed that the mean flow near the piston top is not close to the turbulent boundary layer, and rather has tendency of the Blasius theorem, whereas turbulent intensity near the wall is not low. This tendency is considered to be possible from the viewpoints of the shortage of flow time and the laminarization due to the adverse pressure gradient through the compression stroke. This result shows that revision of a wall heat transfer model based on an assumption of the proper characteristics of flow field near the piston top is required for more accurate prediction of heat flux in gasoline engines.

本文言語English
DOI
出版ステータスPublished - 2017
イベント9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017 - Okayama, Japan
継続期間: 2017 7 252017 7 28

Other

Other9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017
国/地域Japan
CityOkayama
Period17/7/2517/7/28

ASJC Scopus subject areas

  • 制御およびシステム工学
  • 電子工学および電気工学
  • 機械工学

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