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Investigation of the Downwash Induced by Rotary Wings in Ground Effect
Tanabe, Yasutada,Saito, Shigeru,Ooyama, Naoko,Hiraoka, Katsumi The Korean Society for Aeronautical and Space Scie 2009 International Journal of Aeronautical and Space Sc Vol.10 No.1
There are concerns about the influence of the gust wind caused by helicopters affecting the moving vehicles while hovering over the road during rescue activities. For the understanding of such complicated flow. numerical simulation of a rotor hovering above the ground has been carried out, changing the rotor/ground clearances. The rotor thrust is kept constant. and the rotor control is determined by trim adjustments incorporated into the CFD algorithm. Collective pitch angle and the required power decreases with the rotor/ground clearance which agrees with experience. Changes of the flowfield near the rotor with regard to the rotor height are investigated based on the calculated results.
Investigation of the Downwash Induced by Rotary Wings in Ground Effect
Yasutada Tanabe,Shigeru Saito,Naoko Ooyama,Katsumi Hiraoka 한국항공우주학회 2009 International Journal of Aeronautical and Space Sc Vol.10 No.1
There are concerns about the influence of the gust wind caused by helicopters affecting the moving vehicles while hovering over the road during rescue activities. For the understanding of such complicated flow, numerical simulation of a rotor hovering above the ground has been carried out, changing the rotor/ground clearances. The rotor thrust is kept constant, and the rotor control is determined by trim adjustments incorporated into the CFD algorithm. Collective pitch angle and the required power decreases with the rotor/ground clearance which agrees with experience. Changes of the flowfield near the rotor with regard to the rotor height are investigated based on the calculated results.
Investigation of the Downwash Induced by Rotary Wings in Ground Effect
Yasutada Tanabe,Shigeru Saito,Naoko Ooyama,Katsumi Hiraoka 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
There is concerns about the influence of the gust wind caused by helicopter affecting on the moving vehicles while the helicopter hovering over the road during the rescue activity. For the understanding of such complicated flow, numerical simulation of a rotor hovering above the ground has been carried out by changing the rotor/ground clearances. The rotor thrust is kept constant, and the rotor control is determined by trim adjustments incorporated into the CFD algorithm. Collective pitch angle and the required power decreases with the rotor/ground clearance which agrees with the experiences. Changes of the flow field near the rotor with regard to the rotor height are investigated based on the calculated results.
Eisuke Miura,Shin-ichi Masuda,Takanori Ooyama,Satoshi Ishii 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
The generation of quasi-monoenergetic electron beams containing more than 3 × 108 electrons in a monoenergetic peak for energies from 40 to 60 MeV has been demonstrated. The quasimonoenergetic electron beams have been obtained from a plasma with an electron density of 1.6 × 1019 cm−3 produced by an 8-TW, 50-fs Ti:sapphire laser pulse. It is necessary to control the plasma density precisely and to suppress the nanosecond prepulse with the main pulse for stable generation of quasi-monoenergetic beams. Two-dimensional particle-in-cell simulation results are also shown. The simulation result suggests that quasi-monoenergetic beam generation is brought about by matching the laser propagation length with the gas jet length.