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LDA Measurement and a Theoretical Analysis of the In-Cylinder Air Motion in a DI Diesel Engine
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English
Abstract
The swirl velocity in the combustion bowl of a DI diesel engine was measured by means of laser doppler anemometry, varying the swirl intensity and engine speed. At the same time an axisymmetrical two dimensional laminar model for simulating the in-cylinder air motion was presented. The boundary condition of the flow near the wall was investigated by a comparison of predicted and measured swirl velocity, and as a result the free slip condition was found to be suitable for the present model.
A comparison between measured and theoretical swirl velocity revealed that the secondary flow in the combustion bowl induced by an interaction between the squish and swirl flow transfers swirl velocities from points to points, causing a complex time variation of the swirl velocity at an observing point.
Authors
- Shin Matsuoka - Tokyo Institute of Technology Tokyo, Japan
- Takeyuki Kamimoto - Tokyo Institute of Technology Tokyo, Japan
- Tomonori Urushihara - Tokyo Institute of Technology Tokyo, Japan
- Yoshihiro Mochimaru - Tokyo Institute of Technology Tokyo, Japan
- Hideo Morita - Tokyo Institute of Technology Tokyo, Japan
Citation
Matsuoka, S., Kamimoto, T., Urushihara, T., Mochimaru, Y. et al., "LDA Measurement and a Theoretical Analysis of the In-Cylinder Air Motion in a DI Diesel Engine," SAE Technical Paper 850106, 1985, https://doi.org/10.4271/850106.Also In
References
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