Session: 04-16: Atomization & Sprays

Paper Number: 81654

81654 - Improvement of the Primary Atomization Model for Jet Into Subsonic Crossflow 

In order to improve the accuracy of numerical prediction for the atomization process of jet into subsonic crossflow, the original WAVE model was modified and a improved pramary atomization model was suggested, which was based on Euler-Lagrange method, according to the linear instability analysis results under the action of crossflow, considering the difference between droplet separation velocity and jet velocity during fragmentation and the bending of jet under crossflow, coupling with the empirical relation of jet breakup height. At the same time, the original WAVE model and the improved model were implanted into the atomization solver sprayFoam of OpenFOAM, moreover, the atomization process of jet into subsonic crossflow with Mach number of 0.3 was simulated. The results indicate that, compared with the original WAVE model, the simulation with improved primary atomization model can relatively accurately capture the breaking point position of primary atomization (the relative error is reduced from 80% to 10%) and the liquid column jet trajectory (the maximum relative error is reduced from 22.5% to 14.8%) in the near-field atomization region; the prediction performance of the improved primary atomization model for droplet SMD  spatial distribution in the far-field atomization region has been improved as a whole, mainly for large droplets (more than 70 μm,the maximum relative error is reduced by nearly half), the prediction accuracy of far-field droplet velocity spatial distribution exceeds that of the original model as well, and the droplet distribution in a wider spatial range can be captured.

Presenting Author: Ju Hongyu Northwestern Polytechnical University

Presenting Author Biography: Ju Hongyu (1998 -), Ph.D. Candidate, majoring in numerical simulation of aeroengine combustor.

Authors:

Ju Hongyu Northwestern Polytechnical University
Suo Jianqin Northwestern Polytechnical University
Li Yue Northwestern Polytechnical University
Zheng Longxi Northwestern Polytechnical University