【摘 要】
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This paper describes the modeling of CNG (compressed natural gas) spray directly injected from a poppetvalve type injector using gaseous fuel injection mode
【机 构】
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GraduateSchoolofHanyangUniversity,RepublicofKoreaDepartmentofMechanicalEngineering,HanyangUniversity
【出 处】
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13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
This paper describes the modeling of CNG (compressed natural gas) spray directly injected from a poppetvalve type injector using gaseous fuel injection model. Numerical modeling was conducted using the KIVA-3V Release 2 code with some modifications. Three dimensional mesh was used for computational grid. Gaseous fuel injection model was integrated into KIVA-3V Release 2 code with some modifications from liquid injection models. This model could simulate gaseous fuel injection using coarse mesh which saves calculation time. The fine mesh is not required to resolve the inflow boundary for gaseous fuel injection. Likewise with liquid injection model, gaseous spheres are injected as parcels which represent a group of gaseous spheres and these parcels evaporate at a time. The evaporation of gaseous spheres occurs without energy change. Particularly, poppetvalve type injector was used for CNG direct injection therefore hollow cone type injection model was modified. In addition, experiments of gaseous fuel injection was performed for gas-jet visualizations using PLIF (planar laser induced fluorescence) method. For safety reasons, compressed nitrogen was used instead of compressed natural gas in the experiments. The tracer which plays an important role in PLIF experiments was acetone that has a very low boiling point, a high saturation pressure, a good fluorescence and low toxicity. In this study, the simulation results of CNG direct injection were compared to experimental results. The gaseous fuel injection model can reliably predict CNG direct injection.
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