Time-sequenced flow field prediction in an optical spark-ignition direct-injection engine using bidirectional recurrent neural network (bi-RNN) with long short-term …

F Zhao, Z Ruan, Z Yue, DLS Hung, S Som… - Applied Thermal …, 2020 - Elsevier
To further improve the energy conversion efficiency of internal combustion engine, the
transient and complex air flow movement inside the cylinder needs to be better understood …

K-means clustering-driven detection of time-resolved vortex patterns and cyclic variations inside a direct injection engine

F Zhao, DLS Hung, S Wu - Applied Thermal Engineering, 2020 - Elsevier
Time-resolved vortices are indispensable rotational flow structures which impact fuel-air
mixing, combustion, and thermal efficiency of internal combustion engine. In-cylinder flow …

Cyclic analysis of in-cylinder vortex interactions based on data-driven detection and characterization framework

F Zhao, Z Zhou, DLS Hung - … of Engineering for …, 2023 - asmedigitalcollection.asme.org
The complex vortex flow interactions are critical to affect the fuel–air mixing and combustion
stability in direct-injection engine. However, due to the strong cyclic variations inside engine …

Multi-plane time-resolved Particle Image Velocimetry (PIV) flow field measurements in an optical Spark-Ignition Direct-Injection (SIDI) engine for Large-Eddy …

F Zhao, M Liu, P Ge, DLS Hung… - Oil & Gas Science …, 2019 - ogst.ifpenergiesnouvelles.fr
In-cylinder flow characteristics play a significant role in the fuel–air mixing process of Spark-
Ignition Direct-Injection (SIDI) engines. Typically, planar Particle Image Velocimetry (PIV) is …

A coupled phase-invariant POD and DMD analysis for the characterization of in-cylinder cycle-to-cycle flow variations under different swirl conditions

M Liu, F Zhao, DLS Hung - Flow, Turbulence and Combustion, 2023 - Springer
The cycle-to-cycle variations (CCV) of in-cylinder flow make critical impact on internal
combustion engine performance. The flow structure evolution and its cyclic variations need …

Prediction of efficient operating conditions inside a heavy-duty natural gas spark ignition engine using artificial neural networks

J Liu, C Ulishney… - ASME …, 2020 - asmedigitalcollection.asme.org
Research engines with optical access can assist traditional engine development and
optimization by providing first-hand information of in-cylinder combustion process. However …

Transient flow field behavior after end of spray injection under different injection and flash boiling conditions

Z Zhou, F Zhao, DLS Hung, X Li, M Xu - 2023 - sae.org
The continuous improvement of gasoline direct injection (GDI) engine is largely attributed to
the enhanced understanding of air-fuel mixing and combustion processes. This work …

On the use of particle image velocimetry (PIV) data for the validation of Reynolds averaged Navier-Stokes (RANS) simulations during the intake process of a spark …

L Shen, C Willman, R Stone, T Lockyer… - … Journal of Engine …, 2022 - journals.sagepub.com
Computational fluid dynamics (CFD) simulations of the in-cylinder flow field are widely used
in the design of internal combustion engines (ICEs) and must be validated against …

Hybridizing Unsupervised Clustering Methods for In-Cylinder Vortex Motion Analysis under Different Swirl Ratio Conditions

F Zhao, M Liu, W Fan, J Wu, J Zhang, D Hung - 2021 - sae.org
Large-scale vortex motion could enhance the fuel-air mixing and the combustion stability
inside a directinjection engine. For in-cylinder vortex motion analysis, detection of the vortex …

Lessons From the Conversion of a Heavy-Duty Compression Ignition Engine to Natural Gas Spark Ignition Operation

J Liu, C Ulishney… - ASME …, 2020 - asmedigitalcollection.asme.org
Partial conversion of the large inventory of compression-ignition engines to natural-gas (NG)
spark-ignition lean-burn operation can reduce US dependence on imported petroleum and …