RT Journal Article ID 0bdaa01253d03e4e A1 Zhu, Jingyu A1 Nishida, Keiya A1 Uemura, Takumi T1 EXPERIMENTAL STUDY ON FLOW FIELDS OF FUEL DROPLETS AND AMBIENT GAS OF DIESEL SPRAY-FREE SPRAY AND FLAT-WALL IMPINGING SPRAY JF Atomization and Sprays JO AAS YR 2014 FD 2014-05-20 VO 24 IS 7 SP 599 OP 623 K1 diesel spray K1 free spray K1 wall-impinging spray K1 ambient gas flow K1 spray droplet flow K1 LIF-PIV K1 PIV AB The ambient gas flow fields of the free spray and flat wall-impinging spray were measured by using laser induced fluorescence-particle image velocimetry (LIF-PIV) technique in non-evaporating condition. The ambient gas velocity distribution and gas mass flow rate into the spray were analyzed. The droplet flow velocity and vorticity of free spray and impinging spray were measured by particle image velocimetry (PIV) technique, the correlation of spray droplet flow and ambient gas flow under the free spray and impinging spray conditions was studied. The effects of impinging distances (30 mm, 40 mm) and injection pressures (100 MPa, 200 MPa, 300 MPa) were taken into account. Comparing with the free spray, the impinging spray restricts the ambient gas flow at the specific timing; however, showing the same or higher ambient gas flow as function of the penetrating length. Furthermore, the increased vorticity intensity implies that the turbulent mixing and mixture formation inside the spray tend to be improved. The increased fuel injection pressure effectively improves the ambient gas flow and the vorticity intensity of the spray. The effect of injection pressure on the improvement of ambient gas flow becomes moderate under the impingement condition. The shorter spray−wall impinging distance restricts the increase of the spray volume and the ambient gas mass flow rate. PB Begell House LK https://www.dl.begellhouse.com/journals/6a7c7e10642258cc,35d788284f7bb5c7,0bdaa01253d03e4e.html