Abstract
A compressed natural gas injection device with moving-coil electromagnetic linear actuator and mushroom type poppet valve was designed to supply a large-bore intake port injection type engine with sufficient fuel timely. The transient engine CFD model combined with the poppet valve's motion was established to research the effect of injection conditions on the mixing homogeneity in the intake port and cylinder. Computed penetration distances of impinging jet with different k-e models and different wall functions are compared with measured results in the literature to validate the model. It was observed that the gas injection location and number of nozzle holes have a significant effect on mixing performance both in the intake port and cylinder.
Highlights
Compressed natural gas (CNG), one of the most promising alternative fuels, is widely used in engines due to its rich resource and cheap price [1]
The gas fuel mass fraction contour of seven isometric cross sections after the installation location of gas injection device (GID) and iso-surface under these conditions are shown in figure 6
For case3 with 5 nozzle holes, two fuel jets are compelled to the up side of the intake port, while the other three jets still take the form of counter-rotating vortex pair (CVP) under the effect of air flow
Summary
Compressed natural gas (CNG), one of the most promising alternative fuels, is widely used in engines due to its rich resource and cheap price [1]. The driver of GID is mostly solenoid, and the executing component is mostly in the form of spherical or needle valve [4] Such kind of GIDs are small and can be installed in the engine conveniently, its mass flow rate is quite low. The mushroom type poppet valve can be used to deliver gas fuel to the large-bore engine because they have better sealing performance and higher mass flow rate. The wall impingement effect on mixture preparation in a direct injection hydrogen-fuelled engine was studied using CFD and high-speed schlieren imaging technique [10]. Detailed computational fluid dynamics (CFD) simulations combined with the poppet valve's motion have been performed to analyse the effect of injection location and number of nozzle holes on the mixing performance in the intake port and cylinder. Cross-flow and wall impingement within intake port are emphasized
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