The particle modulations to turbulence in roundjets were experimentally studied by means of two-phasevelocity measurements with Phase Doppler Anemometer(PDA). Laden with very large particles, no significant attenuationsof turbulence intensities were measured in the far-fields,due to small two-phase slip velocities and particleReynolds number. The gas-phase turbulence is enhanced byparticles in the near-fields, but it is significantly attenuatedby the small particles in the far-fields. The smaller particleshave a more profound effect on the attenuation of turbulenceintensities. The enhancements or attenuations of turbulenceintensities in the far-fields depends on the energyproduction, transport and dissipation mechanisms betweenthe two phases, which are determined by the particle propertiesand two-phase velocity slips. The non-dimensionalparameter CTI is introduced to represent the change of turbulenceintensity.
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