液体射流在不均匀速度横流中的轨迹和穿透研究

The trajectory and penetration of liquid jet in crossflow with non-uniform velocity distribution were studied experimentally. Using specifically designed perforated plates to realize several non-uniform velocity distributions，water was used as the jet liquid，and the research was carried out by laser sheet combined with phase doppler particle Analyzer. The main concerns involved the average jet momentum flux ratio，the local Weber number and non-uniformity of the transverse velocity distribution. The influence of the crossflow with non-uniform velocity distribution on the liquid jet was mainly reflected in the transformation of the breakup mode along the liquid flow direction. A dimensionless parameter L characterizing the influence range of liquid jet by cross flow was proposed，and an empirical formula suitable for jet trajectory with non-uniformity of −2—2 and jet momentum flux ratio of 10—40 at normal temperature and pressure was constructed. The existence of “primary uplift section” was taken as the criterion to determine whether the subsection fitting was carried out. For non-uniformity less than 1，the jet trajectory was predicted by combining the empirical formula with the linear function diagram of nonuniformity and L. For non-uniformity greater than 1，the location where the liquid jet first developed into composite breakup was taken as the dividing point of “uplift section” and “deflection section”，and the jet trajectory was fitted by segments.