An Overview of Scientific and Technical Literature on Coanda Effect Applied to Nozzles

Trancossi, Michele

doi:10.4271/2011-01-2591

Cited by 58 publications

(27 citation statements)

References 23 publications

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“…3a that the air-blocking shelf hinders the flow of air traveling down the inside wall of the vertical drill shroud and prevents it from directly striking the ground. The airflow above the air-blocking shelf shows a strong Coanda effect, where the airflow tends to attach to nearby surfaces (Trancossi, 2011), while the airflow below the air-blocking shelf does not show any apparent Coanda effect.…”

Section: Characteristics Of Airflow and Dust Underneath The Drill Shroudmentioning

confidence: 99%

Dust control by air-blocking shelves and dust collector-to-bailing airflow ratios for a surface mine drill shroud

et al. 2018

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The National Institute for Occupational Safety and Health (NIOSH) recently developed a series of validated models utilizing computational fluid dynamics (CFD) to study the effects of air-blocking shelves on airflows and respirable dust distribution associated with medium-sized surface blasthole drill shrouds as part of a dry dust collector system. Using validated CFD models, three different air-blocking shelves were included in the present study: a 15.2-cm (6-in.)-wide shelf; a 7.6-cm (3-in.)-wide shelf; and a 7.6-cm (3-in.)-wide shelf at four different shelf heights. In addition, the dust-collector-to-bailing airflow ratios of 1.75:1, 1.5:1, 1.25:1 and 1:1 were evaluated for the 15.2-cm (6-in.)-wide air-blocking shelf. This paper describes the methodology used to develop the CFD models. The effects of air-blocking shelves and dust collector-to-bailing airflow ratios were identified by the study, and problem regions were revealed under certain conditions.

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Section: Characteristics Of Airflow and Dust Underneath The Drill Shroudmentioning

confidence: 99%

Dust control by air-blocking shelves and dust collector-to-bailing airflow ratios for a surface mine drill shroud

et al. 2018

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“…In order to circumvent the problems associated to fluidic thrust vector systems, and benefit from the absence of moving parts, the ACHEON system was introduced [28][29][30]. The HOMER nozzle bears some resemblance with the co- Figure 5.…”

Section: Thrust Vector Classificationmentioning

confidence: 99%

A review of thrust-vectoring in support of a V/STOL non-moving mechanical propulsion system

et al. 2013

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Abstract:The advantages associated to Vertical Short-Take-Off and Landing (V/STOL) have been demonstrated since the early days of aviation, with the initial technolology being based on airships and later on helicopters and planes. Its operational advantages are enormous, being it in the field of military, humanitarian and rescue operations, or even in general aviation. Helicopters have limits in their maximum horizontal speed and classic V/STOL airplanes have problems associated with their large weight, due to the implementation of moving elements, when based on tilting rotors or turbojet vector mechanical oriented nozzles. A new alternative is proposed within the European Union Project ACHEON (Aerial Coanda High Efficiency Orienting-jet Nozzle). The project introduces a novel scheme to orient the jet that is free of moving elements. This is based on a Coanda effect nozzle supported in two fluid streams, also incorporating boundary layer plasma actuators to achieve larger deflection angles. Herein we introduce a state-of-the-art review of the concepts that have been proposed in the framework of jet orienting propulsion systems. This review allows to demonstrate the advantages of the new concept in comparison to competing technologies in use at present day, or of competing technologies under development worldwide.

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“…They must be evaluated and described in similar forms in a form that allow to write an effective equilibrium (7).…”

Section: Definition Of the Problemmentioning

confidence: 99%

“…After the initial bibliographic analysis by Trancossi [7,8] and Pascoa [9], it has been produced a combined CFD and theoretical activity. A preliminary model of the Coanda adhesion of a fluid as a function of angular velocity of a two ducted fan units [10] has realized.…”

Section: Introductionmentioning

confidence: 99%

Design methods of Coanda effect nozzle with two streams

Trancossi¹,

Dumas²,

Das³

et al. 2014

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An Overview of Scientific and Technical Literature on Coanda Effect Applied to Nozzles

Cited by 58 publications

References 23 publications

Dust control by air-blocking shelves and dust collector-to-bailing airflow ratios for a surface mine drill shroud

Dust control by air-blocking shelves and dust collector-to-bailing airflow ratios for a surface mine drill shroud

A review of thrust-vectoring in support of a V/STOL non-moving mechanical propulsion system

Design methods of Coanda effect nozzle with two streams

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