Dynamic behavior of diffusion flame interacting with a large-scale vortex by laser imaging techniques

2005 ◽  
Vol 30 (1) ◽  
pp. 465-473 ◽  
Author(s):  
Masaharu Komiyama ◽  
Tomoya Fujimura ◽  
Toshimi Takagi ◽  
Shinichi Kinoshita
Keyword(s):  
Dynamic Behavior ◽  
Diffusion Flame ◽  
Large Scale ◽  
Imaging Techniques ◽  
Laser Imaging ◽  
Large Scale Vortex

Extinction and interruption of diffusion flame interacting with a large scale vortex

2009 ◽  
Vol 32 (1) ◽  
pp. 1099-1106
Author(s):  
Masaharu Komiyama ◽  
Ryoji Kawabe ◽  
Toshimi Takagi
Keyword(s):  
Diffusion Flame ◽  
Large Scale ◽  
Large Scale Vortex

scholarly journals Visualization of Normal/Inverse Diffusion Flame Behaviors Interacting with Vortex by Laser Imaging Techniques

2007 ◽  
Vol 27 (11) ◽  
pp. 97-104
Author(s):  
Masaharu KOMIYAMA ◽  
Tomoya FUJIMURA ◽  
Toshimi TAKAGI
Keyword(s):  
Diffusion Flame ◽  
Imaging Techniques ◽  
Laser Imaging ◽  
Inverse Diffusion ◽  
Inverse Diffusion Flame

scholarly journals Extinction of Diffusion Flame Interacted with a Large Scale Vortex

2003 ◽  
Vol 69 (681) ◽  
pp. 1296-1302
Author(s):  
Masaharu KOMIYAMA ◽  
Ryoji KAWABE ◽  
Akinori HAYASHI ◽  
Toshimi TAKAGI
Keyword(s):  
Diffusion Flame ◽  
Large Scale ◽  
Large Scale Vortex

Vortex Structure of a Vortex Ring Over a Butterfly Wing and its Dynamic Behavior

2011 ◽  
Author(s):  
Masaki Fuchiwaki ◽  
Taichi Kuroki ◽  
Kazuhiro Tanaka ◽  
Takahide Tabata
Keyword(s):  
Dynamic Behavior ◽  
Vortex Ring ◽  
Large Scale ◽  
Leading Edge ◽  
Micro Air Vehicles ◽  
Butterfly Wing ◽  
Trailing Edge ◽  
Piv Measurement ◽  
Large Scale Vortex ◽  
Secondary Disasters

Micro-Air-Vehicles (MAVs) that mimic the flight mechanisms of insects have been attracting significant attention in recent years. These technologies are developed with the aim of lifesavings in the area with the risk of secondary disasters, maintenance works for constructions such as bridges, information collection on planet searches, monitoring of security risks for the purpose of security means. A number of researchers have attempted to develop small flap flying objects and MAV with various actuators and devices. However, these robots were not practical. One of the reasons for this is that the flying mechanism of insects has not yet been clarified sufficiently. We have clarified that a couple of large-scale vortex is formed over the wing. The purpose of the present study is to clarify the dynamic behavior and the detailed structure of the vortices of the flapping butterfly wing, and we carried out the PIV measurement around the flapping butterfly wing. The vortex ring develops over the wings when the wings flap downward to the bottom dead position and then passes through the butterfly completely and grows until reaching the wake at the bottom dead position. The vortex ring develops over the wing while growing from the leading edge toward the trailing edge. The maximum vorticity of the vortex ring over the wing moves from the leading edge to the trailing edge with the downward flapping. On the other hand, the vorticity of the LEV decays with downward flapping.

ON IMPACT OF LARGE-SCALE VORTEX STRUCTURES ON FLAME SHAPE IN A SWIRLING JET FLOW

2018 ◽  
Vol 11 (2) ◽  
pp. 31-39
Author(s):  
L. М. Chikishev ◽  
◽  
V. М. Dulin ◽  
A. S. Lobasov ◽  
D. М. Markovich ◽  
...  
Keyword(s):  
Large Scale ◽  
Jet Flow ◽  
Vortex Structures ◽  
Swirling Jet ◽  
Large Scale Vortex ◽  
Flame Shape

Unsteady Three-Dimensional Analysis of Inlet Distortion in a Transonic Fan

2006 ◽  
Author(s):  
Peng Sun ◽  
Guotal Feng
Keyword(s):  
Shock Wave ◽  
Total Pressure ◽  
Large Scale ◽  
Three Dimensional ◽  
Navier Stokes ◽  
Inlet Distortion ◽  
Flow Loss ◽  
Large Scale Vortex ◽  
Total Temperature ◽  
Transonic Fan

A time-accurate three-dimensional Navier-Stokes solver of the unsteady flow field in a transonic fan was carried out using "Fluent-parallel" in a parallel supercomputer. The numerical simulation focused on a transonic fan with inlet square wave total pressure distortion and the analysis of result consisted of three aspects. The first was about inlet parameters redistribution and outlet total temperature distortion induced by inlet total pressure distortion. The pattern and causation of flow loss caused by pressure distortion in rotor were analyzed secondly. It was found that the influence of distortion was different at different radial positions. In hub area, transportation-loss and mixing-loss were the main loss patterns. Distortion not only complicated them but enhanced them. Especially in stator, inlet total pressure distortion induced large-scale vortex, which produced backflow and increased the loss. While in casing area, distortion changed the format of shock wave and increased the shock loss. Finally, the format of shock wave and the hysteresis of rotor to distortion were analyzed in detail.

Characteristics of Lean Premixed Flame in Various Oxygen Concentrations Measured by Laser Imaging Techniques

2013 ◽  
Vol 35 (6-8) ◽  
pp. 576-582
Author(s):  
Masaharu Komiyama ◽  
Kenichiro Takeishi ◽  
Yohei Fujita ◽  
Kiyonobu Nakayama
Keyword(s):  
Imaging Techniques ◽  
Premixed Flame ◽  
Laser Imaging ◽  
Lean Premixed ◽  
Oxygen Concentrations

scholarly journals Growth and decay of a large-scale vortex in a turbulent boundary layer.

1990 ◽  
Vol 56 (524) ◽  
pp. 911-918
Author(s):  
Hideharu MAKITA ◽  
Koji SASSA ◽  
Akiyoshi ITABASHI
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Large Scale ◽  
Large Scale Vortex

scholarly journals A Consideration on the Dynamic Behavior and the Structural Design of Large Scale Floating Structure

1995 ◽  
Vol 1995 (178) ◽  
pp. 473-483 ◽  
Author(s):  
Hideyuki Suzuki ◽  
Koichiro Yoshida
Keyword(s):  
Dynamic Behavior ◽  
Structural Design ◽  
Large Scale ◽  
Floating Structure
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