Design methods of Coanda effect nozzle with two streams

Trancossi, Michele; Dumas, Antonio; Das, Shiam Sumantha; Páscoa, José

doi:10.13111/2066-8201.2014.6.1.8

Cited by 17 publications

(6 citation statements)

References 19 publications

(27 reference statements)

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“…Trancossi and Pascoa applied it to the design of ground vehicles [28], Coanda effect nozzles [29][30] and aircrafts [31][32]. Pascoa applied it to the optimization of DBD aerodynamic actuators [33][34] and of cyclorotor propellers [35][36].…”

Section: Constructal Designmentioning

confidence: 99%

Can constructal law and exergy analysis produce a robust design method that couples with industry 4.0 paradigms? The case of a container house

Trancossi¹,

Cannistraro²,

Páscoa³

2018

MMEP

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Constructal law deals with evolution and generation of new configurations of a physical system according to first and the second law of thermodynamics. Constructal law based design allows understanding the basic principles of the evolution of design in nature and to evolve a system through the maximization of its efficiency. On the other side, Digital Twin is a foundational paradigm of Industry 4.0. Digital Twin is the technological framework that allows an effective lifecycle analysis of a system and an effective comparison of different configurations. It allows determining the digital model of a physical system and replicating its evolution. This paper investigates how they can be complementary instruments of engineering and design process inside a knowledge based framework that opens the way through a knowledge-based, holistic and evolutional perspective in engineering. This paper aims to verify if an extended and evolved digital twin model that conforms with a multidisciplinary application of constructal law can be realized through the design of an optimized low-cost container house for social housing. The results demonstrate not only the efficiency and the results of the proposed system and that the results allow an effective improvement of the system performances and that this improvement is realized through an effective design which can be realized as it is with a finite precision, which is the one that is allowed by the real industrial components.

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Section: Constructal Designmentioning

confidence: 99%

Can constructal law and exergy analysis produce a robust design method that couples with industry 4.0 paradigms? The case of a container house

Trancossi¹,

Cannistraro²,

Páscoa³

2018

MMEP

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“…The law of conservation of mass [22] becomes: where subscripts 'i' and 'e' indicate energy inflows and outflows respectively. The equation can be expressed in a dimensionless form by multiplying both terms by L/(μAw) and becomes on the control volume equals the time rate of change of the momentum.…”

Section: Conservation Of Massmentioning

confidence: 99%

“…The dimensionless expression of the conservation equations (19) to (22) has allowed defining a new local dimensionless magnitude, which is derived from the traditional definition of Bejan number by Bhattacharjee et al and generalised by Awaz. It appears as a local formulation of Bejan number, which characterises inlets and outlets of the domain or subdomain and applies in any arbitrary point of a fluid dynamic system.…”

Section: Consideration On Bejan Number and The Defined Bejan Dimensiomentioning

confidence: 99%

A new dimensionless approach to general fluid dynamics problems that accounts both the first and the second law of thermodynamics

Trancossi¹,

Páscoa²

2018

MMEP

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Fluid dynamic systems are usually optimised through the equation of conservation of energy according to the first law of thermodynamics. In the aeronautic sector, many authors are claiming the insufficiency of this approach and are developing studies and models with the aim of coupling the analyses according to the first and the second law of thermodynamics. Second law analysis of internal fluid dynamics has not been studied with the same attention. Just heat exchangers and heat dissipation by electronic circuits are mostly considered. This paper focuses on the analysis of general internal fluid flow problem and recognizes initially it according to the first law of thermodynamics. The energy equation for a control volume is given in integral form along with a discussion on the concepts of total energy, heat and work. The dissipative terms, which need to be minimised to increase the system efficiency, are deeply analysed leading to a new dimensionless formulation of the equation of conservation of energy. It is based on Bejan number, according to the formulation by Bhattacharjee and Grosshandler. This formulation has been directly connected to second law analysis concerning both entropy generation and exergy dissipation making a step toward a future unification of the two alternative formulations of Bejan number which have been historically developed. The ambition of this research is far from providing a definitive solution. Otherwise, it aims to both raise problems and stimulate a discussion. Bejan number has been actually used in the definition of diffusive phenomena, such as convection and diffusion through porous media. Is it reasonable to enlarge its domain to the much larger domain of general fluid dynamics? If this extension will be evaluated possible, what are the potential implications for the future of scientific research? Can be the ambiguity between Hagen number and Bejan number be resolved? Can be the ambiguity between the diffusive definition and the entropy generation definition of Bejan number be solved? Can it be possible to state the equivalence between the two alternative formulations? Is it possible to define fluid dynamic and diffusive problems according to a unified vision in the domain of thermodynamics? What are the implications concerning analysis and optimisation of fluid dynamics phenomena by new equations that couples first and the second law of thermodynamics? Could it have the role of producing an effective unification of a larger multidisciplinary domain?

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“…A preliminary mathematical model of a 2D case of the system has been developed, focusing on the combined effect of the mixing effect of the two streams and the Coanda Effect Adhesion over a convex surface. Trancossi et al [19] have specifically modelled the ACHEON Coanda effect two streams nozzle. The paper tries to produce an effective design guideline, which can be adopted for design activities of the nozzle for aeronautic propulsion.…”

Section: Coanda Nozzle Modellingmentioning

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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Design methods of Coanda effect nozzle with two streams

Cited by 17 publications

References 19 publications

Can constructal law and exergy analysis produce a robust design method that couples with industry 4.0 paradigms? The case of a container house

Can constructal law and exergy analysis produce a robust design method that couples with industry 4.0 paradigms? The case of a container house

A new dimensionless approach to general fluid dynamics problems that accounts both the first and the second law of thermodynamics

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

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