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Large Eddy Simulation of turbulent combustion flows in gas-turbine combustors
Nobuyuki Oshima,Yusuke Takahashi 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.11
This research investigates turbulent combustion model based on a multiple-scalar flamelet approach coupling the two concepts of premixed and non-premixed and non-premixed flames expressed by the conservative scalar of mixture fraction and the levelset function(G-equation) of premixed flame front, respectively. A new conceptual G-equation is developed for capturing the complicated non-premixed flame propagation, which can directly model not only the flame speed and also the flame thickness. For applying to real scale gas-turbine combustor, the large eddy simulation (LES) is introduced to simulate the unsteady phenomena of turbulent combustion. The new flamelet model can be applied in the unsteady simulation on the practical unstructured grid system without any additional numerical viscosity or re-initialization treatment. Industrial applications to different types of gas-turbine combustors are introduced. In any case, premixed or partial premixed turbulent flames by the complex burner system of industrial combustor can be reasonably captured by the new flamelet approach without any additional numerical procedure or artificial diffusive scheme.
Litan Kumar Saha,Nobuyuki Oshima 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5
"A serpentine flow channel is one of the most common and practical channel layouts for Polymer electrolyte fuel cells (PEFCs) since it ensures the removal of water produced in the cell with an acceptable parasitic load. The operating parameters such as temperature, pressure and flow distribution in the flow channel and gas diffusion layer (GDL) has a great influence on the performance of PEFCs. It is desired to have an optimum pressure drop because a certain pressure drop helps to remove excess liquid water from the fuel cell, too much of pressure drop would increase parasitic power needed for the pumping air through the fuel cell. In order to accurately estimate the pressure drop precise calculation of mass conservation is necessary. Flow crossover in the serpentine channel and GDL of PEFC has been investigated by using a transient, non-isothermal and three-dimensional numerical model. Considerable amount of cross flow through GDL is found and its influence on the pressure variation in the channel is identified. The results obtained by numerical simulation are also compared with the experimental as well as theoretical solution."
Anticancer and immunological enhancement effects in Fuscoporia oblique
Yeunhwa Gu,Yuka Itokawa,Takashi Masubuchi,Nobuyuki Endo,Masami Oshima,Takashi Nsakamura,Toshihiro Maenaka,Torao Ishita,Kaori Tano,Yuri Kurono,Hiroyuki Sekimoto,Tetsuo Takeuchi,Kyoo Seok Ahn 한의병리학회 2006 대한동의병리학회 학술대회논문집 Vol.2006 No.9