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The fossil fuels are major sources of the energy for the transport and power industry. The combustion of the fossil fuels forms environmental pollution, and their availability is rapidly depleting. These issues have opened the possibilities for the application of the alternative fuels. A bio-CNG considered in this study is a form of a methane-rich biogas. The current work reflects on improving the intake manifold design with port-fuel injection. It aims to study the mixing phenomena of air with bio-CNG. This work aims to discover the effect of suction pressure variation at the manifold outlet on air and bio-CNG mixing. Further, the load variations are also studied, which is responsible for the variation of the vacuum pressure inside the intake manifold. The work is performed at different ratios of the curvature radius of the manifold bend (R) to the manifold diameter (D), and consequently, the manifold design is optimized. The R/D ratios are varied between 1, 1.5, 1.75, and 2. The geometries are designed in PTC Creo 5.0, followed by computational simulations in finite volume-based solver ANSYS Fluent 19.2. The parameters of the mixture such as pressure, velocity, helicity, turbulence, and CH4 mass fraction are analyzed and compared for the different configurations of the manifold.

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Effect of Varying the Suction Pressure and Load Variation on the Mixing of Air and Bio-CNG in the Intake Manifold of a Dual-Fuel Diesel Engine—A CFD Study

  • 章节

  • 发表日期：

    2026年

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  • Shivam Sharma,
  • Porhi Kyndiah,
  • Michelle Mukhim,
  • Hanna Daphi Dkhar,
  • Akash Chandrabhan Chandekar,
  • Biplab Kumar Debnath,
  • Koushik Das

摘要

The fossil fuels are major sources of the energy for the transport and power industry. The combustion of the fossil fuels forms environmental pollution, and their availability is rapidly depleting. These issues have opened the possibilities for the application of the alternative fuels. A bio-CNG considered in this study is a form of a methane-rich biogas. The current work reflects on improving the intake manifold design with port-fuel injection. It aims to study the mixing phenomena of air with bio-CNG. This work aims to discover the effect of suction pressure variation at the manifold outlet on air and bio-CNG mixing. Further, the load variations are also studied, which is responsible for the variation of the vacuum pressure inside the intake manifold. The work is performed at different ratios of the curvature radius of the manifold bend (R) to the manifold diameter (D), and consequently, the manifold design is optimized. The R/D ratios are varied between 1, 1.5, 1.75, and 2. The geometries are designed in PTC Creo 5.0, followed by computational simulations in finite volume-based solver ANSYS Fluent 19.2. The parameters of the mixture such as pressure, velocity, helicity, turbulence, and CH4 mass fraction are analyzed and compared for the different configurations of the manifold.