Macro Characteristics of the Spray from Intersecting Hole Nozzles
The formation method of the intersecting hole nozzle, each hole is formed by the converging of two or more child holes, is proposed, for the purpose of accelerating the fuel-air mixing process of direct injection internal combustion engines. In order to examine the macro characteristics of intersecting hole nozzles, three single-orifice intersecting hole nozzles, with the intersecting point of the axes of child holes locating inside, outside, and right at the exit surface, were manufactured. And high speed photography was employed to visualize, thus to quantify the angle and penetration of, the spray from these intersecting hole nozzles in a vessel under ambient room temperature and pressure of 0.1 to 2.0 MPa. The experimental results showed that the spray from intersecting hole nozzles were fan-shaped, which were beneficial for prompting the fuel-air mixing. Particularly, when the intersecting points of the axes of child holes locate right at the exit surface, the longest spray penetration was obtained, and the spray front angle is slightly smaller than side angle. While the intersecting points of the axes of child holes locate inside or outside the exit surface, the spray penetration is shorter, and the spray front angles are extremely larger than side angles under pressure of 0.1 to 2.0 MPa. With the rising of ambient pressure, the differences between front angle and side angle of all the three intersecting hole nozzles become smaller in different degrees.
X. Y. Leng et al., "Macro Characteristics of the Spray from Intersecting Hole Nozzles", Applied Mechanics and Materials, Vols. 110-116, pp. 343-349, 2012