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Title: Analysis of internal combustion engine in-cylinder flow using particle image velocimetry.
Author: Pommier, L. S.
Awarding Body: University of Brighton
Current Institution: University of Brighton
Date of Award: 1999
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An experimental rig based on dynamic similarity was developed as a joint project between the University of Brighton and Ricardo Consulting Engineers to study the large scale fluid structures generated in the cylinder of reciprocating engines during the induction stoke. Planner Laser Sheet Imaging (PLSl) was used for flow visualisation while Particle Image Velocity (PIV) provided full field velocity vector diagrams. This rig, however, suffered from a number of shortcomings, which were overcome in a new design of a second ring. Positive feedback provisions for the piston and valve motions were introduced and electronic interface and computer software were designed and developed to increase the accuracy and efficiency of this new rig. Two techniques were developed to allow the study of the flow in swirl planes in cases where complex piston geometries are used such as in Diesel or Gasoline Direct Ignition (GDl) engines. The first was based on developing a mixture of fluids with a refractive index matching that of the piston material. An extensive study was carried out to find the right mixture and mathematical algorithms were developed to examine the limits of applicability of such technique. The second method was based on mathematically deducing the swirl plane flow from planes in the tumble and cross-tumble planes. This technique had the added advantage of providing a three dimensional map of the flow. The flow in a large number of engine geometries was studied and clearly showed the effect of various engine geometrical parameters on the flow structure. The main characteristics of the flow patterns are presented and characterised by a number of derived global parameters. The effect of these characteristics on the engine performance and emissions were demonstrated and helped to explain some unexpected engine combustion performance. Correlations between the derived flow parameters and engine performance in terms of burn periods and emission levels are also presented for a number of cases.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available