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Reverse engineering of research engine cylinder-head

Cieślik Wojciech, Szwajca Filip, Wisłocki Krzysztof

Combustion Engines

2022

R. 61, nr 2

73--82

The pursuit of increasing the efficiency of internal combustion engines is an ongoing engineering task that requires numerous research efforts. New concepts of injection or combustion systems require preliminary investigation work using research engines. These engines, usually single-cylinder, make it possible to isolate a single variable in a complex combustion mixture preparation process, thus enabling analysis of the changes being made. However, these engines are relatively expensive and their designs are offered by a limited number of manufacturers. The authors of this paper have successfully undertaken the engineering task of modifying an existing research engine cylinder head in such a way as to implement an electronically controlled variable valve timing system of the intake system. The process of reverse engineering, together with design assumptions that finally contributed to the construction of the assumed solution has been described in this paper.

Tomographic measurement techniques : visualization of multiphase flows

Lorcher M., Schmitz D., Mewes D.

Machine Graphics and Vision

1999

Vol. 8, No. 4

667-679

A tomographic measurement technique is applied for visualization of the local void fraction in the two phase flow of air and water in the mixing chamber of a two-phase-nizzle. With this measurement technique a high spatial and temporal resolution can be achieved. The measured physical property is the electric conductivity of the water. The conductivity is measured with pairs of wires strained in the investigated cross section. The measurement values are proportional to ralative liquid fraction. With an algebraic reconstruction technique (ART) the field of the liquid fraction in the investigated cross-section in calculated from the measurement values. The quality of the reconstruction is increased by a-priori-knowledge.