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The intake manifold is a crucial component in the intake system. The main function of the intake manifold is to provide an even mixture of air and fuel and induce turbulent flow. The length of the intake manifold significantly influ- ences the uniformity of the air and fuel mixture. Therefore, modification of the length of the intake manifold can be done to achieve optimal results. This study uses the CFD (Computational Fluid Dynamics) method to obtain quantitative and qualitative data through simulations. Quantitative data includes the size and per- centage of the number of fuel particles, pressure, and speed. Qualitative data in- clude fuel distribution, pathline, velocity contours and vectors, and pressure con- tours. The simulation results show that the longer the intake manifold, the distri- bution of fuel particles becomes more even and the speed is more uniform. The length of the intake manifold also affects the pressure drop at the outlet, where the longer the intake manifold, the lower the pressure.

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Numerical Study of Intake Manifold Length Effect on Air and Fluid Flow Pattern on a 125 cc SOHC Engine

  • 会议论文

  • 发表日期：

    2025年

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  • Giri Nugroho,
  • Dimitra Meidina Kusnadi,
  • Joko Sar-Setiyanto,
  • Heru Mirmanto

摘要

The intake manifold is a crucial component in the intake system. The main function of the intake manifold is to provide an even mixture of air and fuel and induce turbulent flow. The length of the intake manifold significantly influ- ences the uniformity of the air and fuel mixture. Therefore, modification of the length of the intake manifold can be done to achieve optimal results. This study uses the CFD (Computational Fluid Dynamics) method to obtain quantitative and qualitative data through simulations. Quantitative data includes the size and per- centage of the number of fuel particles, pressure, and speed. Qualitative data in- clude fuel distribution, pathline, velocity contours and vectors, and pressure con- tours. The simulation results show that the longer the intake manifold, the distri- bution of fuel particles becomes more even and the speed is more uniform. The length of the intake manifold also affects the pressure drop at the outlet, where the longer the intake manifold, the lower the pressure.