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| Study on Measurement Accuracy of an Inlet Port Steady Flow Test Rig |
| DOI：10.13949/j.cnki.nrjgc.2020.04.009 |
| Key Words:inlet port steady flow test accuracy analysis measurement system analysis |
| Author Name | Affiliation | | WEI Pengfei,PAN Jie,LU Zhen,WANG Tianyou,TAN Congmin,HAO Caifeng | 1.State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
2.Engine R&D Center, Weichai Power Co., Ltd., Weifang 261061,China |
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| Abstract:In order to ensure the measurement accuracy of an inlet port steady flow test rig, the error analysis theory and the measurement system analysis method were used to analyze the main sources affecting the measurement accuracy from direct and indirect factors. Results showed that the measurement accuracy of swirl momentum meter and intake flow meter had the greatest influence on the measurement results of swirl ratio and flow coefficient, accounting for 85.68% and 94.15% of total measurement error, respectively. For the valve lift deviation of 0.1mm, the measurement result would change about 1%. When the outward deviation of the measured cylinder head positioning reached 1.0mm, the swirl ratio may increased by 14.43%, but the flow coefficient would not change significantly. Moreover, the repeatability and reproducibility of the steady flow test rig could reach 28%, and the reproducibility of human factors would hardly affect the test results. |
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