Accès ouvert
2026
article
OpenAlex
Dongchan Kim, Seung Woo Lee, Qing Nian Chan, Sanghoon Kook
Ammonia sprays undergo significant flash boiling due to its high vapour pressure. Towards effective mixture making critical for ammonia combustion in engines, a fundamental understanding of flash-boiling ammonia sprays is required to which optical diagnostic research could provide useful information. The present …
au, kr
(code pays fourni par la source)
Accès ouvert
2025
article
OpenAlex
ChengHua Zhang, Dongchan Kim, S. Lee, Sanghoon Kook
Injection timing in low-pressure hydrogen direct injection (H 2 LPDI) engines plays a critical role in optimising gas jet structure and mixture formation due to the complex and transient nature of ambient air flow and density inside the cylinder. This study systematically …
au, kr
(code pays fourni par la source)
2025
article
OpenAlex
ChengHua Zhang, Dongchan Kim, Sanghoon Kook, Seung Woo Lee
Split injection is widely used in conventional spark ignition engines to control mixture formation. To utilise split injection in a hydrogen direct injection engine, it is important to understand gas jet development and its variations with injection timing. This is because prolonged …
au, kr
(code pays fourni par la source)
2025
article
OpenAlex
Jinxin Yang, Dongchan Kim, Kenneth Kim, Eric Mayhew et autres
The present study applies high-speed Mie-scattering spray imaging and flame image velocimetry (HS-FIV) to a jet fuel flame in a small-bore optical compression-ignition engine. The integration of sustainable aviation fuel (SAF) into the jet fuel supply may introduce challenges for stable engine …
au, us
(code pays fourni par la source)
2024
article
OpenAlex
Dongchan Kim, ChengHua Zhang, Yongrae Kim, Seung Woo Lee et autres
This study aims to find the impact of the nozzle shape of a side-mounted, 3.5-MPa pintle injector on hydrogen concentration and flame development in a low-pressure direct-injection spark ignition (H2LPDI) engine. To this end, endoscopic high-speed imaging of gas jet laser shadowgraph …
au, kr
(code pays fourni par la source)
Accès ouvert
2024
article
OpenAlex
Dongchan Kim, Quancen Wan, Qing Nian Chan, Yoshimitsu Kobashi et autres
This study develops spark induced breakdown spectroscopy (SIBS) for measurements of direct injected hydrogen concentration in a multi-cylinder engine operated at real conditions. To this end, calibration is performed in the air excess ratio (λ) range of 2.1 ∼ 2.9 and simultaneously, …
au, jp
(code pays fourni par la source)
2023
article
OpenAlex
Jinxin Yang, Dongchan Kim, Sanghoon Kook, Kenneth Kim et autres
This study applies high-speed particle image velocimetry (HS-PIV) and flame image velocimetry (HS-FIV) to show flow fields under the effect of varied swirl ratios in a small-bore optical compression-ignition engine. The base swirl ratio and maximum swirl ratio conditions were applied to …
au, us
(code pays fourni par la source)
2023
article
OpenAlex
Dongchan Kim, Lingzhe Rao, Sanghoon Kook, Seung Woo Lee et autres
Three cylinder heads with varied intake port shapes are experimentally investigated to evaluate intake flow structures and their influence on near top dead centre (TDC) flow fields and turbulence distributions in a motored high-tumble engine. The endoscopic high-speed particle image velocimetry (eHS-PIV) …
au, kr
(code pays fourni par la source)
Accès ouvert
2022
conference-paper
OpenAlex
Dongchan Kim, Sanghoon Kook, Seung Woo Lee, Hong-kil Baek
Demands for high efficiency spark ignition engines have led to intake port and combustion chamber design achieving enhanced flow and turbulence. The present study reports a significantly improved version of the original endoscopic high-speed particle image velocimetry (eHS-PIV) developed and implemented in …
au, kr
(code pays fourni par la source)
Accès ouvert
2021
article
OpenAlex
Yuwei Lu, Dongchan Kim, Jinxin Yang, Sanghoon Kook
High-speed flame imaging has been widely used to investigate flame propagation in optically accessible direct-injection spark-ignition (DISI) engines. Previous studies utilized a high-speed movie to measure the overall growth rate of the flame and to analyze the flame shape and its correspondence …
au
(code pays fourni par la source)
Accès ouvert
2021
article
OpenAlex
Dongchan Kim, Lingzhe Rao, Sanghoon Kook, Heechang Oh et autres
This study performs endoscopic high-speed imaging to enhance the fundamental knowledge of in-cylinder flow structure and flame development process in a selected high-tumble production engine. The endoscopic high-speed particle image velocimetry (eHS-PIV) was performed for varied engine speeds and intake valve closing …
au, kr
(code pays fourni par la source)
Accès ouvert
2021
article
OpenAlex
Hannae Lee, Dongchan Kim, Hyun Soo Lee
Genetic code expansion (GCE) technology is a useful tool for the site-specific modification of proteins. An unnatural amino acid (UAA) is one of the essential components of this technique, typically required at high concentration (1 mM or higher) in growth medium. The …
kr
(code pays fourni par la source)