SpICED: Design and Control of a Safe Spherical Blimp using Coandă Effect

2021 ◽  
Author(s):  
Ying Hong Pheh ◽  
Shane Kyi Hla Win ◽  
Shaohui Foong
Keyword(s):  
Coanda Effect ◽  
Coandǎ Effect ◽  
And Control

scholarly journals Bluff body drag manipulation using pulsed jets and Coanda effect

2016 ◽  
Vol 805 ◽  
pp. 422-459 ◽  
Author(s):  
Diogo Barros ◽  
Jacques Borée ◽  
Bernd R. Noack ◽  
Andreas Spohn ◽  
Tony Ruiz
Keyword(s):  
Bluff Body ◽  
Three Dimensional ◽  
Base Pressure ◽  
Coanda Effect ◽  
Wake Time ◽  
Recirculating Flow ◽  
Flow Deviation ◽  
Coandǎ Effect ◽  
And Control ◽  
The Impact

The impact of fluidic actuation on the wake and drag of a three-dimensional blunt body is investigated experimentally. Jets blowing tangentially to the main flow force the wake with variable frequency and amplitude. Depending on the forcing conditions, two flow regimes can be distinguished. First, in the case of broadband actuation with frequencies comprising the natural wake time scale, the convection of the jet structures enhances wake entrainment, shortens the length of the recirculating flow and increases drag. Secondly, at higher actuation frequencies, shear-layer deviation leads to fluidic boat tailing of the wake. It additionally lowers its turbulent kinetic energy thus reducing the entrainment of momentum towards the recirculating flow. The combination of both mechanisms produces a rise in the base pressure and reduces the drag of the model. Both actuation regimes are characterized by complementary velocity, pressure and drag measurements at several upstream conditions and control parameters. By adding curved surfaces to deviate the jets by the Coanda effect, periodic actuation is reinforced and drag reductions of approximately 20 % are achieved. The unsteady Coanda blowing not only intensifies the flow deviation and the base pressure recovery but also preserves the unsteady high-frequency forcing effect on the turbulent field. The present results encourage further development of fluidic control to improve the aerodynamics of road vehicles and provide a complementary insight into the relation between wake dynamics and drag.

Design Optimization, Modeling, and Control of Unmanned Aerial Vehicle Lifted By Coandă Effect

2017 ◽  
Vol 22 (3) ◽  
pp. 1327-1336 ◽  
Author(s):  
Hyunyong Lee ◽  
Seonhye Han ◽  
Hyoju Lee ◽  
Jaehyeok Jeon ◽  
Choonghan Lee ◽  
...  
Keyword(s):  
Design Optimization ◽  
Unmanned Aerial Vehicle ◽  
Coanda Effect ◽  
Optimization Modeling ◽  
Modeling And Control ◽  
Aerial Vehicle ◽  
Coandǎ Effect ◽  
And Control

Modeling and control of a saucer type Coandä effect UAV

2017 ◽  
Author(s):  
Jameson Y. Lee ◽  
Seung Hwan Song ◽  
Hyun Wook Shon ◽  
Hyouk Ryeol Choi ◽  
Woosoon Yim
Keyword(s):  
Coanda Effect ◽  
Modeling And Control ◽  
Coandǎ Effect ◽  
And Control

Flow attachment to solid surfaces: The Coanda effect

AIChE Journal ◽  
1972 ◽  
Vol 18 (1) ◽  
pp. 51-57 ◽  
Author(s):  
T. Panitz ◽  
D. T. Wasan
Keyword(s):  
Solid Surfaces ◽  
Coanda Effect ◽  
Coandǎ Effect

scholarly journals Comparison of CFD simulations and measurements of flow affected by coanda effect

2012 ◽  
Vol 25 ◽  
pp. 01015 ◽  
Author(s):  
Jan Fišer ◽  
Jan Jedelský ◽  
Tomáš Vach ◽  
Matěj Forman ◽  
Miroslav Jícha
Keyword(s):  
Coanda Effect ◽  
Cfd Simulations ◽  
Coandǎ Effect

Surface Tension Effects on Discharge Capacity of Coanda-Effect Screens

2021 ◽  
Vol 147 (8) ◽  
pp. 04021026
Author(s):  
Tony L. Wahl ◽  
Christopher C. Shupe ◽  
Hajrudin Dzafo ◽  
Ejub Dzaferovic
Keyword(s):  
Surface Tension ◽  
Discharge Capacity ◽  
Coanda Effect ◽  
Coandǎ Effect

scholarly journals Theoretical Modeling, Design and Simulation of an Innovative Diverting Valve Based on Coanda Effect

Fluids ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 103
Author(s):  
Giancarlo Comes ◽  
Carlo Cravero
Keyword(s):  
Fluid Dynamics ◽  
Mathematical Model ◽  
Computational Fluid Dynamics ◽  
Additive Manufacturing ◽  
Water Flow ◽  
Coanda Effect ◽  
Geometrical Parameters ◽  
Convex Wall ◽  
Fluidic Device ◽  
Coandǎ Effect

The present work is focused on the study of an innovative fluidic device. It consists of a two-ways diverter valve able to elaborate an inlet water flow and divert it through one of the two outlets without moving parts but as a result of a fluctuation of pressure induced by two actuation ports, or channels. Such apparatus is named Attachment Bi-Stable Diverter (ABD) and is able to work with the effect of the fluid adhesion to a convex wall adjacent to it, this phenomenon is known as Coanda Effect; it generates the force responsible for the fluid attachment and the consequent deviation. The main purpose of this work is to develop a knowhow for the design and development of such particular device. A mathematical model for the ABD has been developed and used to find the relationships between the geometrical parameters and the operative conditions. A configuration has been designed, simulated with a computational fluid dynamics approach. A prototype has been printed with and additive manufacturing printer and tested in laboratory to check the effective working point of the device.

Potential model of the coanda effect

1979 ◽  
Vol 13 (4) ◽  
pp. 492-503 ◽  
Author(s):  
V. M. Khanin
Keyword(s):  
Potential Model ◽  
Coanda Effect ◽  
Coandǎ Effect
Sign in / Sign up

Export Citation Format

Share Document