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Technical Paper

Unsteady Gasoline Injection Experiments: Comparison of Measurements in Quiescent Air and in a Model Intake Port

1995-02-01
950512
PDA-measurements of gasoline injection in a flow chamber and a simplified manifold-intake port configuration under constant air velocity have been performed. An acrylic glass model of an intake port without valves was mounted to a production manifold, equipped with a commercial plate-type gasoline injector. The PDA was set up in a 30° forward scatter arrangement to obtain dominant first order refracted light from the test gasoline droplets. The PDA-measurements could be synchronized with the injection cycle, thus achieving a simulated crank angle resolution in the engine. Measurements were made 70 mm downstream of the injection nozzle in both the chamber and the intake port experiments. Due to the geometry of the intake port and the near forward scatter set-up of the PDA, the probe volume could be traversed through the center of the port to obtain radial profiles of mean droplet sizes and velocities. For the profile measurements 5000 samples were taken at each point.
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