The turbulence measurement during the intake and compression process for high-turbulence generation around spark timing

Abstract

Abstract

In-cylinder turbulence of an engine was generated by an intake pressure effect and inertia effect during the intake process and it was generated and decreased by the compression effect of a piston during the compression process. The separate measurement of the turbulence generated by these factors during each process was necessary to generate high turbulence around the spark timing. A single-shot rapid intake compression expansion machine (RICEM) was manufactured and evaluated for this purpose. The RICEM could carry out the intake and compression processes separately or in a row. It was proved that the RICEM simulated not only high temperature and high pressure field but also the same flow pattern as a real engine. The turbulence generated by each factor was measured in the swirl field of the RICEM. As the result, it was also found that enhancing the turbulence by the compression effect of a piston with improvement of the flow at the beginning of the compression process was desirable.