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In the development process of a 1.2NA engine air duct, to improve the overall power performance, we performed an optimization based on the original air duct, and the flow performance of the modified air duct was re-evaluated. This article applies AVL FIRE software to perform steady-state simulation analysis on the modified airway, obtaining the flow coefficient, roll ratio, velocity field, and pressure field distribution inside the cylinder under different fixed valve lifts. According to the AVL evaluation method, the average flow coefficient of the V1 intake duct of a certain 1.2NA engine is 0.3623, which is 4.8% lower than that of the V0 intake duct, and the flow coefficient is at a moderately low level. According to the FEV evaluation method, the average standard flow coefficient of the intake duct is 0.1008, which is 8.4% higher than that of the V0 duct, and the flow coefficient is at a moderate level. According to the AVL evaluation method, the average roll flow intensity of the V1 intake duct is 1.3953, which is 17.1% higher than that of the V0 intake duct, and the resulting roll flow intensity is at a moderate level. Airway tests are recommended to verify the calculation results.

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CFD Calculation and Analysis of a 1.2NA Intake Duct

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

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  • Hongxia Zhao,
  • Qingsong Zhu,
  • Minjie Liu,
  • Lin Zhou

摘要

In the development process of a 1.2NA engine air duct, to improve the overall power performance, we performed an optimization based on the original air duct, and the flow performance of the modified air duct was re-evaluated. This article applies AVL FIRE software to perform steady-state simulation analysis on the modified airway, obtaining the flow coefficient, roll ratio, velocity field, and pressure field distribution inside the cylinder under different fixed valve lifts. According to the AVL evaluation method, the average flow coefficient of the V1 intake duct of a certain 1.2NA engine is 0.3623, which is 4.8% lower than that of the V0 intake duct, and the flow coefficient is at a moderately low level. According to the FEV evaluation method, the average standard flow coefficient of the intake duct is 0.1008, which is 8.4% higher than that of the V0 duct, and the flow coefficient is at a moderate level. According to the AVL evaluation method, the average roll flow intensity of the V1 intake duct is 1.3953, which is 17.1% higher than that of the V0 intake duct, and the resulting roll flow intensity is at a moderate level. Airway tests are recommended to verify the calculation results.