Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Development of Flash Boiling Spray Prediction Model of Multi-hole GDI Injector Using Machine Learning

머신러닝을 이용한 다공형 GDI 인젝터의 플래시 보일링 분무 예측 모델 개발

  • 상몽소 (전남대학교 일반대학원 기계공학과) ;
  • 신달호 (건국대학교 일반대학원 기계공학과) ;
  • ;
  • 박수한 (건국대학교 기계항공공학부)
  • Received : 2022.02.21
  • Accepted : 2022.03.14
  • Published : 2022.06.30
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Abstract

The purpose of this study is to use machine learning to build a model capable of predicting the flash boiling spray characteristics. In this study, the flash boiling spray was visualized using Shadowgraph visualization technology, and then the spray image was processed with MATLAB to obtain quantitative data of spray characteristics. The experimental conditions were used as input, and the spray characteristics were used as output to train the machine learning model. For the machine learning model, the XGB (extreme gradient boosting) algorithm was used. Finally, the performance of machine learning model was evaluated using R2 and RMSE (root mean square error). In order to have enough data to train the machine learning model, this study used 12 injectors with different design parameters, and set various fuel temperatures and ambient pressures, resulting in about 12,000 data. By comparing the performance of the model with different amounts of training data, it was found that the number of training data must reach at least 7,000 before the model can show optimal performance. The model showed different prediction performances for different spray characteristics. Compared with the upstream spray angle and the downstream spray angle, the model had the best prediction performance for the spray tip penetration. In addition, the prediction performance of the model showed a relatively poor trend in the initial stage of injection and the final stage of injection. The model performance is expired to be further enhanced by optimizing the hyper-parameters input into the model.

Keywords

Acknowledgement

이 연구는 한국연구재단 중견연구자지원사업(2019R1A2C1089494)과 한-인도 해외협력기반조성사업(2020K1A3A1A19088692)의 지원으로 수행되었습니다. 지원기관에 감사드립니다.

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