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A new cascade-less engine operated from subsonic to hypersonic conditions: designed by computational fluid dynamics of compressible turbulence with chemical reactions

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Journal of Thermal Science 2010年第6期19卷 481-485页

作者： Ken Naitoh kazushi nakamura Takehiro Emoto Waseda University Faculty of Science and Engineering

By using our computational fluid dynamic models, a new type of single engine capable of operating over a wide range of Mach numbers from subsonic to hypersonic regimes is proposed for airplanes, whereas traditional piston engines, turbojet engines, and scram engines work only under a narrower range of operating conditions. The new engine has no compressors or turbines such as those used in conventional turbojet engines. An important point is its system of super multijets that collide to compress gas for the transonic regime. Computational fluid dynamics is applied to clarify the potential of this engine. The peak pressure at the combustion center is over 2.5 MPa, while that just before ignition is over 1.0 MPa. The maximum power of this engine will be sufficient for actual use. Under the conditions of higher Mach numbers, the main intake passage located in front of the super multijet nozzles, takes in air more. That results in a ram or scramjet engine for supersonic and hypersonic conditions.

关键词： Aircraft engine multijets twister system compressible flow

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The Association of Polypharmacy and Hypertension with Fall Risks among the Elderly Patients

The Association of Polypharmacy and Hypertension with Fall R...

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The 8th Asia/Oceania Regional Congress of Gerontology and Geriatrics

作者： Taro Kojima Masahiro Akishita Tetsuro nakamura kazushi Nomura Yumiko Ohike Sumito Ogawal Katsuya Iijima Masato Eto Yasuyoshi Ouchi Department of Geriatric Medicine Graduate School of Medicine The University of Tokyo Department of Geriatric Medicine Graduate School of Medicine The University of Tokyo Research Institute of Aging Science Department of Geriatric Medicine Graduate School of Medicine The University of Tokyo Department of Geriatric Medicine Graduate School of Medicine The University of Tokyo Department of Geriatric Medicine Graduate School of Medicine The University of Tokyo Department of Geriatric Medicine Graduate School of Medicine The University of Tokyo Department of Geriatric Medicine Graduate School of Medicine The University of Tokyo Department of Geriatric Medicine Graduate School of Medicine The University of Tokyo

＜正＞Purpose:To identify the risks of falls among the elderly outpatients,fall risk and associated factors were examined in a cross-sectional study design. Method:We enrolled 259 outpatients（mean 76 years-old,male ... 详细信息

关键词： Fall polypharmacy hypertension hypnotic

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