Results 31 to 40 of about 172,920 (309)

The motion of an axisymmetric body falling in a tube at moderate Reynolds numbers [PDF]

, 2013
This study concerns the rectilinear and periodic paths of an axisymmetric solid body (short-length cylinder and disk of diameter d and thickness h) falling in a vertical tube of diameter D.
Ern, Patricia, Brosse, Nicolas
core   +1 more source

Design of a control system for a 1.5 m diameter coaxial rigid rotor model

Hangkong gongcheng jinzhan
As a key equipment for rotor wind tunnel testing, the design specifications and control accuracy of the rotor test bench directly determine the testing accuracy and effectiveness of the rotor wind tunnel testing.
LIU Shi, SHAO Tianshuang, LIU Xiangnan
doaj   +1 more source

Low Reynolds Number Rotor Blade Aerodynamic Analysis

MATEC Web of Conferences, 2019
Maintaining a steady hover flight in a rotorcraft usually requires high energy input. The aim of the paper is to prove that it is possible to vastly reduce energy use in a rotorcraft by reducing the disc loading.
Tulwin Tytus
doaj   +1 more source

Stochastic low Reynolds number swimmers [PDF]

Journal of Physics: Condensed Matter, 2009
As technological advances allow us to fabricate smaller autonomous self-propelled devices, it is clear that at some point directed propulsion could not come from pre-specified deterministic periodic deformation of the swimmer's body and we need to develop strategies to extract a net directed motion from a series of random transitions in the ...
Golestanian, R., Ajdari, A.
openaire   +6 more sources

Rotor blade design and dynamic characteristics analysis of unmanned helicopter

Hangkong gongcheng jinzhan
The widespread application of composite materials in blades also makes the force and stiffness characteristics of blades more complex than traditional blades.
GAO Hongbo
doaj   +1 more source

Is the critical Reynolds number universal?

Journal of Experimental and Theoretical Physics, 2002
7 pages, 4 ...
Novopashin, Sergey, Muriel, Amador
openaire   +2 more sources

Three-dimensional structure of a low-Reynolds-number turbulent boundary layer

, 2004
A low-Reynolds-number zero-pressure-gradient incompressible turbulent boundary layer was investigated using a volumetric imaging technique. The Reynolds number based on momentum thickness was 700.
Delo, C., Smits, A., Kelso, R.
core   +1 more source

Numerical Validation of a Multi-Dimensional Similarity Law for Scaled STOVL Aircraft Models

Aerospace
The complex jet-ground interactions of Short Take-off and Vertical Landing (STOVL) aircraft are critical to flight safety and performance, yet studying them with traditional full-scale wind tunnel tests is prohibitively expensive and time-consuming ...
Shengguan Xu, Mingyu Li, Xiance Wang, Yanting Song, Bingbing Tang, Lianhe Zhang, Shuai Yin, Jianfeng Tan   +7 more
doaj   +1 more source

Laminar-to-Turbulence Transition Revealed Through a Reynolds Number Equivalence

Engineering, 2019
Flow transition from laminar to turbulent mode (and vice versa)—that is, the initiation of turbulence—is one of the most important research subjects in the history of engineering.
Xiao Dong Chen
doaj   +1 more source

Optimal Swimming at Low Reynolds Numbers [PDF]

Physical Review Letters, 2004
Efficient swimming at low Reynolds numbers is a major concern of microbots. To compare the efficiencies of different swimmers we introduce the notion of ``swimming drag coefficient'' which allows for the ranking of swimmers. We find the optimal swimmer within a certain class of two dimensional swimmers using conformal mappings techniques.
Avron, J. E., Gat, O., Kenneth, O.
openaire   +3 more sources