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Author

Heuy Dong Kim

Other affiliations: Queen's University Belfast
Bio: Heuy Dong Kim is an academic researcher from Andong National University. The author has contributed to research in topics: Nozzle & Shock wave. The author has an hindex of 19, co-authored 365 publications receiving 2207 citations. Previous affiliations of Heuy Dong Kim include Queen's University Belfast.


Papers
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TL;DR: In this paper, a review of the fundamental characteristics of the shock train and pseudo-shock is presented, and some simple predictions are made to simulate these very complicated phenomena, and control methods of the pseudo-shocks are also described.

478 citations

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TL;DR: In this paper, the authors report the findings of numerical simulation of filling process of hydrogen tanks, which can aid in optimizing the filling time and in identifying the most suitable locations for the feedback devices within on-board hydrogen tanks.

68 citations

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TL;DR: In this paper, a comparative study is performed to identify a suitable turbulence model for compressed hydrogen tank filling problem, and the realizable k-e model is the most suitable model.

55 citations

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TL;DR: In this paper, the authors investigated the influence of the nozzle geometry on the near-field structures of highly underexpanded SFA jets, and they showed that the distance from the nozzle exit to the Mach disk is an increasing function of the jet-pressure ratio.

52 citations

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TL;DR: In this paper, the effect of a baffle plate, installed at the duct exit, on the impulse wave was investigated both experimentally and by numerical calculation, and the results were in good agreement with the results of numerical calculations.

45 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the state of the art on the aerodynamic and aeroacoustic problems of high-speed railway train and highlights proper control strategies to alleviate undesirable aerodynamic problems.

446 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive literature review on ejector refrigeration systems and working fluids is presented, which deeply analyzes ejector technology and behavior, refrigerant properties and their influence over ejector performance.
Abstract: The increasing need for thermal comfort has led to a rapid increase in the use of cooling systems and, consequently, electricity demand for air-conditioning systems in buildings. Heat-driven ejector refrigeration systems appear to be a promising alternative to the traditional compressor-based refrigeration technologies for energy consumption reduction. This paper presents a comprehensive literature review on ejector refrigeration systems and working fluids. It deeply analyzes ejector technology and behavior, refrigerant properties and their influence over ejector performance and all of the ejector refrigeration technologies, with a focus on past, present and future trends. The review is structured in four parts. In the first part, ejector technology is described. In the second part, a detailed description of the refrigerant properties and their influence over ejector performance is presented. In the third part, a review focused on the main jet refrigeration cycles is proposed, and the ejector refrigeration systems are reported and categorized. Finally, an overview over all ejector technologies, the relationship among the working fluids and the ejector performance, with a focus on past, present and future trends, is presented.

359 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of six well-known turbulence models for the study of supersonic ejectors was evaluated and the results showed that the k-omega-sst model agrees best with experiments.

323 citations

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TL;DR: In this article, the dynamics of unstart of a floor-mounted inlet/isolator model in a Mach 5 flow were investigated experimentally, where the inlet section contains a 6-deg compression ramp, and the isolator is a rectangular straight duct that is 25.4mm high by 50.8mm wide by 242.3mm long.
Abstract: DOI: 10.2514/1.40966 The dynamics of unstart of a floor-mounted inlet/isolator model in a Mach 5 flow are investigated experimentally. The inlet section contains a 6-deg compression ramp, and the isolator is a rectangular straight duct that is 25.4-mm high by 50.8-mm wide by 242.3-mm long. Measurements made include 8-kHz schlieren imaging and simultaneous fast-response wall pressures along the length of the inlet/isolator. Unstart is initiated by deflecting a flap at the downstream end of the isolator. The shock system, induced by unstart, initially propagates upstream through the isolator at a velocity of about 35 m=s (in the laboratory frame of reference), then decelerates to about 20 m=s near the isolator entrance, and then accelerates to a velocity of about 74 m=s within the inlet. Throughout the isolator, unstart is seen to be strongly associated with boundary-layer separation. Once the inlet has unstarted, a highamplitudeoscillatory(periodic)unstarted flowensues,forwhichtheoscillationfrequencyisabout124Hz.However, under some conditions, an 84-Hz oscillatory unstarted flow mode, with lower pressure fluctuations, is observed. Under other conditions, a nonoscillatory unstarted flow, with much lower pressure fluctuations, is observed.

264 citations

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TL;DR: The role of smart technologies can become very important and useful to solve the main population issues nowadays and provide foundations for a sustainable future as mentioned in this paper, however, the main challenge is to reduce the effects of global warming and ensure a balanced economic development of society.

235 citations