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An Experimental Study on the Improvement of Aerodynamic Characteristics Using the Blowing for RLV
Shigeki TSUCHIYA,Shigeru ASO,Yasuhiro TANI 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
To improve the aerodynamic characteristics of Reusable Launch Vehicles (RLV), active flow control methods with blowing were investigated. The testing models are wing body and lifting body contigurations. The experiments have been conducted in low-speed wind tunnels of Kyushu University and transonic wind tunnel of ISAS (Institute of Space and Astronautical Science), JAXA (Japan Aerospace Exploration Agency). For the active flow control, the blowing along the fuselage surface was chosen. Flow visualization results show that the vortex on the fuselage is greatly moved near the fuselage, and the vortex core of the wing is clearly observed. The aerodynamic characteristics result shows that the blowing increases the lift and lift-to-drag ratio. From those results, we confirmed that the blowing can be useful for the improvement of aerodynamic characteristics of the RLV.
Numerical Study on Supersonic Mixing Enhancement with a Ramp Injector and a Cavity
Fumihiko NISHIMOTO,Kohei YAMAGUCHI,Shigeru ASO,Yasuhiro TANI 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
In the present study, supersonic mixing enhancement has been investigated computationally for a SCRAM-jet engine model combustor with a swept ramp injector and a cavity. The calculation condition of the main stream are Ma = 3.96, total pressure 1.27 MPa and total temperature 283 K. In order to enhance the mixing among fuel and air a cavity is placed downstream of the ramp injector. The position and geometry of the cavity plays an important role in mixing efficiency. Therefore L/D and the Length from the ramp to the cavity have been varied. From numerical results. the mixing efficiency was the highest when L/D =2, but the total pressure loss was also the highest compared to L/D= 1,3 and 4.
Kono Maori,Okuda Tomoaki,Ishihara Nami,Hagino Hiroyuki,Tani Yuto,Okochi Hiroshi,Tokoro Chiharu,Takaishi Masayuki,Ikeda Hidefumi,Ishihara Yasuhiro 한국독성학회 2023 Toxicological Research Vol.39 No.1
Fine particulate matter (PM2.5) exposure has a risk of inducing several health problems, especially in the respiratory tract. The skin is the largest organ of the human body and is therefore the primary target of PM2.5. In this study, we examined the effects of PM2.5 on the skin using a human 3-dimensional cultured epidermis model. PM2.5 was collected by cyclonic separation in Yokohama, Japan. Global analysis of 34 proteins released from the epidermis revealed that the chemokines, chemokine C-X-C motif ligand 1 (CXCL1) and interleukin 8 (IL-8), were significantly increased in response to PM2.5 exposure. These chemokines stimulated neutrophil chemotaxis in a C-X-C motif chemokine receptor 2-dependent manner. The oxidative stress and signal transducer and activator of transcription 3 pathways may be involved in the increased expression of CXCL1 and IL-8 in the human epidermis model. Interestingly, in the HaCaT human keratinocyte cell line, PM2.5 did not affect chemokine expression but did induce IL-6 expression, suggesting a different effect of PM2.5 between the epidermis model and HaCaT cells. Overall, PM2.5 could induce the epidermis to release chemokines, followed by neutrophil activation, which might cause an unregulated inflammatory reaction in the skin.