Mathematical Modeling of Coanda Effect

Trancossi, Michele; Dumas, Antonio; Vucinic, Dean

doi:10.4271/2013-01-2195

Cited by 16 publications

(9 citation statements)

References 5 publications

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“…and n = 7 allows good results for the Coanda effect at the wall, as supported also by the work of Pope and Pelfrey [17,18] for the mathematical modeling of generalized turbulent flows, with particular reference to the flat plane flow equations and the turbulent curved jets, as reports Trancossi [19]. Trancossi [11] demonstrated that with the hypothesis of moderate wall curvature (i.e., the curvature ratio = ℎ ≪ 1) the boundary layer analysis is close to the flat plate case. So, defining a proper Reynolds number, relative to the outflow on the convex wall:…”

Section: It Holdsmentioning

confidence: 68%

“…Trancossi [11] demonstrated that with the hypothesis of moderate wall curvature (i.e., the curvature ratio C r = h R c 1) the boundary layer analysis is close to the flat plate case. So, defining a proper Reynolds number, relative to the outflow on the convex wall:…”

Section: It Holdsmentioning

confidence: 88%

“…In Figure 5, a sketch of the configuration under study is reported and the mathematical model is based on this reference flow structure The above system (17) can be solved numerically, taking into account that the angle θ * will be realistically in the range 0-45 • . After a revision of the available literature for similar configurations [11][12][13][14], a first geometry guess for the ABD is obtained assuming the parameters in Table 1. The flow attachment point coordinate is:…”

Section: Mathematical Model Of the Abdmentioning

confidence: 99%

See 2 more Smart Citations

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

Comes

Cravero

2018

Fluids

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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.

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Section: It Holdsmentioning

confidence: 68%

Section: It Holdsmentioning

confidence: 88%

Section: Mathematical Model Of the Abdmentioning

confidence: 99%

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

Comes

Cravero

2018

Fluids

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“…Dragan [11] has independently validated the preliminary Coanda effect model by Trancossi and Trancossi and Dumas. A general overview has been produced by Dumas et al [12] 1.3 Coanda effect modelling Significant research activity has been conducted on Coanda effect modelling and analysis. In particular, Trancossi, Dumas et al [13] produced a theoretical model of Coanda attachment mechanisms and the laws of the Coanda effect. The proposed model has been realized by integration of Navier Stokes equations starting from the Dragan [14] model.…”

Section: Acheon Nozzle Architecturementioning

confidence: 99%

A new aircraft architecture based on the ACHEON Coanda effect nozzle: flight model and energy evaluation

Trancossi

Madonia

Dumas

et al. 2016

Eur. Transp. Res. Rev.

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Aeronautic transport has an effective necessity of reducing fuel consumption and emissions to deliver efficiency and competitiveness driven by today commercial and legislative requirements. Actual aircraft configurations scenario allows envisaging the signs of a diffused technological maturity and they seem very near their limits. This scenario clearly shows the necessity of radical innovations with particular reference to propulsion systems and to aircraftarchitecture consequently.\ud Methods\ud This paper presents analyses and discusses a promising propulsive architecture based on an innovative nozzle, which allows realizing the selective adhesion of two impinging streams to two facing jets to two facing Coanda surfaces. This propulsion system is known with the acronym ACHEON (Aerial Coanda High Efficiency Orienting Nozzle). This paper investigates how the application of an all-electric ACHEONs propulsion system to a very traditional commuter aircraft can improve its relevant performances. This paper considers the constraints imposed by current state-of-the-art electric motors, drives, storage and conversion systems in terms of both power/energy density and performance and considers two different aircraft configurations: one using battery only and one adopting a more sophisticated hybrid cogeneration. The necessity of producing a very solid analysis has forced to limit the deflection of the jet in a very conservative range (±15°) with respect to the horizontal. This range can be surely produced also by not optimal configurations and allow minimizing the use of DBD. From the study of general flight dynamics equations of the aircraft in two-dimensional form it has been possible to determine with a high level of accuracy the advantages that ACHEON brings in terms of reduced stall speed and of reduced take-off and landing distances. Additionally, it includes an effective energy analysis focusing on the efficiency and environmental advantages of the electric ACHEON based propulsion by assuming the today industrial grade high capacity batteries with a power density of 207 Wh/kg.\ud Results\ud It has been clearly demonstrated that a short flight could be possible adopting battery energy storage, and longer duration could be possible by adopting a more sophisticated cogeneration system, which is based on cogeneration from a well-known turboprop, which is mostly used in helicopter propulsion. This electric generation system can be empowered by recovering the heat and using it to increase the temperature of the jet. It is possible to transfer this considerable amount of heat to the jet by convection and direct fluid mixing. In this way, it is possible to increase the energy of the jets of an amount that allows more than recover the pressure losses in the straitening section. In this case, it is then possible to demonstrate an adequate autonomy of flight and operative range of the aircraft. The proposed architecture, which is within the limits of the most conservative results obtained, demonstrates significant additional ...

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“…investigated [11] and a preliminary analysis of the Coanda adhesion based on a simplified exact integration of Navier-Stokes equation under a set of simplified hypothesis [12] has produced. After these results, it has been possible to obtain an effective model of the nozzle using Bernoulli theorem integral equations and the inviscid irrotational flow hypothesis by Bradshaw [13].…”

Section: Incas Bulletin Volume 6 Issue 1/ 2014mentioning

confidence: 99%