Experimental Study of Spray Properties in Variable Structure Nozzle

In order to study the influence of nozzle taper(K-factor) to spray properties,the spray experiments are made with a number of nozzles of different K-factor.It is found that in the case of the same nozzle outside diameter with the K-factor increasing,in the primary period of spray the spray penetration increases and spray cone angle decreases and the projected spray cross-sectional area increase;in the late period of spray these change is not obvious.With the common rail pressure increasing,the spray penetration increases and the projected spray cross-sectional area increases,and the influence of common rail pressure to spray cone angle is not obvious,and the affect of K-factor to penetration decreases.With environmental back pressure increasing,the spray penetration decreases,and the spray cone angle increases,and the projected spray cross-sectional area decreases,and the affect of K-factor to penetration decreases.