The analysis of amplification and damping of turbulence subjected to a rapid compression–expansion in an engine-like geometry

Abstract

The dilatation effect on turbulence kinetic energy was analyzed by experiments and calculations for a rapid compression-expansion machine. Theoretical analysis shows that whether turbulence kinetic energy increases or decreases during compression depends on the turbulence characteristic time at the beginning of compression. The turbulent flows were measured under several different initial strengths of turbulence with a hot-wire anemometer and a LDV. Combined theoretical/experimental analyses validate the theoretical finding.