A5003645239- Fluid Dynamics and Turbulent Flows
- Aerodynamics and Acoustics in Jet Flows
- Plasma and Flow Control in Aerodynamics
- Combustion and flame dynamics
- Particle Dynamics in Fluid Flows
- Nuclear Engineering Thermal-Hydraulics
- Hydrology and Sediment Transport Processes
- Aerosol Filtration and Electrostatic Precipitation
- Computational Fluid Dynamics and Aerodynamics
- Flow Measurement and Analysis
- Aerodynamics and Fluid Dynamics Research
- Lattice Boltzmann Simulation Studies
- Network Security and Intrusion Detection
- Plasma Diagnostics and Applications
- Anomaly Detection Techniques and Applications
- Smart Grid Security and Resilience
- Laser-Plasma Interactions and Diagnostics
- Fluid Dynamics and Vibration Analysis
- Advanced Thermodynamic Systems and Engines
- Amino Acid Enzymes and Metabolism
- Aerospace and Aviation Technology
- Radiative Heat Transfer Studies
- CCD and CMOS Imaging Sensors
- Advanced Memory and Neural Computing
- Sensor Technology and Measurement Systems
Nihon University
2013-2023
Meiji University
2023
College of Industrial Technology
2012
Tokai University
2002
Yogurt is made by fermenting milk with 2 lactic acid bacteria, Lactobacillus delbrueckii ssp. bulgaricus and Streptococcus thermophilus. To comprehensively understand the protocooperation mechanism between S. thermophilus L. in yogurt fermentation, we examined 24 combinations of cocultures comprising 7 fast- or slow-acidifying strains 6 strains. Furthermore, 3 NADH oxidase (Nox)-deficient mutants (Δnox) one pyruvate formate-lyase deficient mutant (ΔpflB) were used to evaluate factor that...
A densely packed colloidal suspension, called a paste, is known to remember the direction of its motion because plasticity. Because memory in paste determines preferential for crack propagation, desiccation pattern morphology depends on motions (memory effect paste). Two types effects are vibration and flow. When dried, it usually shows an ``isotropic random cellular'' pattern. However, when vibrated before drying remembers vibrational motion, primary cracks propagate perpendicular...
This paper describes the multisensor control system for rescue robot, which is necessary to save a human life at great disaster. Basically this type of robot controlled by operator, but it needs an autonomous function safe and fast reaction. Here, we made model whose hand provides distributed tactile sensors; force/torque sensor slip sensor. The signal processing method controlling are investigated By fundamental experiments grasping pulling up dummy, first few steps work, works well in...
Three-dimensional numerical simulation of the flow field around a NACA0012 airfoil at Reynolds number 10,000 was carried out to clarify three-dimensionalization process 7 degrees angle attack. The results show primary instability in laminar separation bubble on suction side which leads subsequent nonlinear equilibrium. feature most amplified velocity fluctuation good agreement with that predicted by linear stability theory free shear layer. secondary begins near end induces spanwise...
The pressure distribution on a NACA0012 airfoil was measured in order to clarify the flow field around low-Reynolds-number region from 10,000 50,000. In present study, wind tunnel and wing model with 70 static ports were used for measurements. surface by micro-pressure sensor. Based obtained distributions, we confirmed detail behavior of separation bubble observed change short into long bubble. As angle attack increased, non-linearity aerodynamic characteristics affected both changes point...
Flow structures are inherently three-dimensional (3D). In order to examine complex flow fields, such as side jets, it is necessary watch the time variation of 3D structure. present work we focused on visualization a gaseous jet with jets. It specifically vicinity nozzle issuing helium gas vertically into ambient air. Cross-sectional images flow-field which very small particles smoke mixed can be visualized through Mie scattering using laser sheet. The optical system for scanning sheet...
We consider pulsating jets as one method for the rapid mixing of two different gases. Pulsed carbon dioxide gas was issued from a round nozzle into still air. The intensity pulsation set at value which produced an oscillatory reversed flow in exit. Spatial and temporal changes concentration velocity were investigated region. gases is dramatically enhanced near Neither nor monotonically decays streamwise direction, because ambient air drawn periodically by flow. direction boundary, position...
When sufficiently low density fluid, such as helium gas, is issued from a round nozzle, radial ejections, which called side jets, are generated at the near field. From visualized cross section of jet column by PLMS, becomes asymmetric when jets formed. Fluctuations between center and boundary in gas synchronize perfectly measured coherence function, fluctuations include many harmonic components. The generation components related to side-jet formation. Each phase angles for fundamental...
In order to measure concentration in gas flow, a probe which consists of sonic nozzle and hot-wire was developed. The this type named probe. We already proposed method velocity measurements by the an ordinary probe, simultaneously measured instantaneous values turbulent jets. present paper deals with another using piezoresistive sensor, impact tube. Instantaneous mixture is given from density means total pressure sensor pulsating jet where carbon dioxide pulsed loudspeaker issues into still...
It is thought that local absolute instability by jet fluid with low density and Widnall of a vortex ring are related side-jets formation in round low-density. If the sufficiently lower than ambient fluid, an initial region two-dimensional becomes locally unstable. Side jets formed rectangular as similar to jet, when fluid. Relationship between streamwise vortexes discussed from result three-dimensional imaging for jet.
We have developed a small power supply of DBD plasma actuator（PA）to use PA as control surfaces model airplane. The has favorable characteristics to drive PA. think that is applied vertical surface having symmetric airfoil instead usual rudder. As the surface, two airfoils with were examined. Aerodynamic measured varying velocity ratio uniform induced by result, can be used device yawing moment airplane in low speed.
When a low density fluid, such as hot air and helium gas, is discharged from round nozzle, side jets are generated in the initial region of jet. These radial ejections jet fluid called jets. It thought that by self-excited oscillations column. The caused local absolute instability. We think instability column feedback effect an external counter flow. was confirmed formed with flow, using flow visualization planar laser Mie scattering.
It has been known that the side jets are formed in a round jet when density of fluid is lower than ambient fluid. The ratio between and for side-jet formation generally 0.7. However, it found out flow structure similar to helium gas exists air jet, namely uniform-density by visualization shear layer three-dimensional imaging jet. In this experiment, generated Reynolds number from 2,000 3,000, although 1.
We carried out both aerodynamic forces measurements and flow visualization tests of a NACA0012 airfoil model at Re = 30,000 in order to verify what kind effect does operating pulsed plasma actuator on field aerodynamics the airfoil. Modulation frequency mode was varied as non-dimensional modulation F^+ from 1 10. The were improved by regardless mode. And stall characteristics clearly changed that maximum lift value angle attack increased depending F^+. over show different continuous mode;...
When a low density fluid, such as helium gas and hot air, is discharged from round nozzle, side jets may be generated at the initial region of jet. The are radial ejections jet fluid. side-jet formation estimated by issuing conditions flow. mainly ratio between fluid ambient velocity profile speed nozzle outlet. A with was visualized three-dimensional imaging. From SD-visualization, several simultaneously, vortex ring distorted same time. process has not been understood even now. In present...
In low Reynolds numbers region's flow, a laminar separation region and bubble are observed on an airfoil surface, these flow contribute to become worse aerodynamic characteristics of the airfoil. We intended improve aerodynamics NACA0012 using pulsed DBD plasma actuator as control device for suppressing separated flow. visualized measured field around examine effect induced by at 30,000 number. As results, we confirmed that were changed existing vortices surface which depend F+ changing.
Side jets are generated in round by causing self-excited oscillations when the density of issuing fluid is sufficiently lower than that ambient fluid. The side a helium gas jet rotate slowly azimuthal direction. In this case, both varicose and spiral modes unstable. While, produced two-dimensional with low-density However, side-jet formation plane not has been confirmed until now. An aim study examined using flow visualization. When initial region jet, formed. mode does appears.