Measurements of Three Dimentional Flow of an Engine using Flow Visualization adopted Color Layers. 2nd Report. Improvement of Measuring System, Examination of Velocity Measurement and Application to Simulated Engine Model.

Abstract

In-Cylinder gas flow is one of the most important factors that affect to the combustibility of premixture in the cylinder and heat transfer to the cylinder walls of an engine. Many papers have been published about gas flow measrement in an engine and flow visualization method is one of the effective means. In our previous report, a method of three dimentional measurement, that is called layer method, was introduced that the depth information perpendicular to the image plane is represented by color of tracer. In this paper, improvements of measurering system, mainly about the optical systems, were made and examined measuring accuracy. Flow velocity in a tube of laminar flow and that of unsteady flow with vortex were measured and they were compared with theoretical value and measured value by LDV respectively. Furthermore, flow in a model engine was measured. As a result, it is confirmed that the system was improved in accuracy and was able to adopted to unsteady flow measurement.