ACTA AERONAUTICAET ASTRONAUTICA SINICA >
A prediction algorithm of collection efficiency based on gradient descent method
Received date: 2021-09-14
Revised date: 2021-11-17
Accepted date: 2021-12-11
Online published: 2021-12-24
Supported by
National Natural Science Foundation of China(12132019);National Major Science and Technology Project （J2019-Ⅲ-0010-0054）
The collection efficiency transfer from impinging point to grid nodes is indispensable when determining droplet impingement property by the traditional Lagrange method. However， the general interpolation technique may bring errors and make the results disagree with the reality in the three-dimensional case. To void the interpolation， this paper proposed a new strategy that gets the trajectory of impinging near the grid node by the gradient descent method and calculates the collection efficiency on the cell center. The improved algorithm uses a deviation function iteration by gradients descent method to reduce the distance between an impinging point and the grid node. And then， a neighbor search algorithm is applied to obtain all the possible trajectories that the droplets end at the grid node. Finally， the collection efficiency on the center of the surface control element could be presented with the tube define model. In this paper， some representative cases valuated the improved method. The testing report showed that the calculation results using the proposed method are consistent with the experimental data and are better than the interpolation results by the traditional algorithm.
Jinghao REN , Qiang WANG , Weihao LI , Yu LIU , Xian YI . A prediction algorithm of collection efficiency based on gradient descent method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(4) : 126381 -126381 . DOI: 10.7527/S1000-6893.2021.26381
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