Engine Intake Port Design for Swirling Flow by Using CFD Numerical Method
碩士 === 國立臺北科技大學 === 車輛工程系所 === 96 === This paper focuses on the design of engine intake port geometry, in order to generate strong charge swirling flow. Using computational fluid dynamics commercial software-FLUENT, adopt turbulence model to calculate intake flow field of a single cylinder four-va...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2008
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/bm4tyv |
| Summary: | 碩士 === 國立臺北科技大學 === 車輛工程系所 === 96 === This paper focuses on the design of engine intake port geometry, in order to generate strong charge swirling flow. Using computational fluid dynamics commercial software-FLUENT, adopt turbulence model to calculate intake flow field of a single cylinder four-valve motorcycle engine in steady state. To simulate the real condition that engine intake flow test by flow bench. The method is to analyze 3D CAD file directly while engine design. Finally, compare the flow coefficient and the swirl ratio value with experiment data. The result of twin-valve opening of original intake port case displays an accurate prediction while low valve lift and the error is 1.14%. The other one original case by closing right-hand intake valve makes air flow to cylinder tangentially. It will generate swirl then calculate the swirl ratio. The result displays a good accuracy by using high order discrete scheme while wide valve lifts, and the average swirl ratio is 2.041. The error is only 0.443%. Then modify the intake port geometry, design a curve angle to change air flow direction. To achieve the target of engine intake swirling flow design. The result gets stronger swirling flow than second one. The average swirl ratio is 3.784.
|
|---|