The Experts below are selected from a list of 2280 Experts worldwide ranked by ideXlab platform

Eduardo Lincheta - One of the best experts on this subject based on the ideXlab platform.

  • design optimization of twin fluid atomizers with an internal mixing chamber for heavy fuel oils
    Fuel Processing Technology, 2009
    Co-Authors: German Ferreira, Antonio Lozano, Felix Barreras, Juan Antonio Garcia, Eduardo Lincheta
    Abstract:

    The present work is devoted to determine the magnitude of the main parameters that yield the optimum results for twin-fluid nozzles with an internal mixing chamber. The focus is placed on the study of the interaction of both air and liquid flows at the internal chamber and its effects on the resulting spray. To this end, some experiments have been performed for different air central channel diameters and liquid ports, as well as for several experimental Conditions (air and liquid mass flow rates), in order to understand the influence of the flow Conditions at the mixing chamber on the size of the droplets produced. It has been demonstrated that under certain experimental Conditions the atomizing fluid discharged to the internal chamber is choked. The Sonic Condition is achieved for different air and liquid mass flow rates as a function of the air central channel diameter. It has also been obtained that to achieve the best results with moderate atomizing fluid flow rates, it is convenient to operate in choked Conditions. This is an important result that will help in the optimum design of this type of nozzles.

Michael Kingan - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic theory of the many-bladed contra-rotating propeller: physics of the wake interaction noise critical sources
    Journal of Fluid Mechanics, 2019
    Co-Authors: A. B. Parry, Michael Kingan
    Abstract:

    In the theory of interaction noise from contra-rotating propellers with many blades, the usual far-field radiation formulae can be re-cast as a double integral, over a source surface, which can be evaluated asymptotically solely in terms of the contributions from critical points. The paper shows that these critical points have a particularly interesting physical meaning. They relate to locations on an event line, running between hub and tip, that represent the locus of the wake–blade interactions at a fixed point in time. The event line rotates at the speed of the spinning interaction tone but does not coincide with the radial variation in either the wake location or the rear blade leading edge. At the precise critical locations on the event line, it is shown that the Mach number of the event line is unity in the direction of the observer (the Sonic Condition) and the tangent to the event line – at a fixed time – is normal to a line drawn between it and the observer (the normal-edge Condition). The zero-mode case is also considered, for which we show that, even though the event line rotates at infinite speed, there can still exist locations that satisfy the Sonic and normal-edge Conditions. The paper also discusses the physical meaning of the lower-order boundary solutions from the hub and tip.

German Ferreira - One of the best experts on this subject based on the ideXlab platform.

  • design optimization of twin fluid atomizers with an internal mixing chamber for heavy fuel oils
    Fuel Processing Technology, 2009
    Co-Authors: German Ferreira, Antonio Lozano, Felix Barreras, Juan Antonio Garcia, Eduardo Lincheta
    Abstract:

    The present work is devoted to determine the magnitude of the main parameters that yield the optimum results for twin-fluid nozzles with an internal mixing chamber. The focus is placed on the study of the interaction of both air and liquid flows at the internal chamber and its effects on the resulting spray. To this end, some experiments have been performed for different air central channel diameters and liquid ports, as well as for several experimental Conditions (air and liquid mass flow rates), in order to understand the influence of the flow Conditions at the mixing chamber on the size of the droplets produced. It has been demonstrated that under certain experimental Conditions the atomizing fluid discharged to the internal chamber is choked. The Sonic Condition is achieved for different air and liquid mass flow rates as a function of the air central channel diameter. It has also been obtained that to achieve the best results with moderate atomizing fluid flow rates, it is convenient to operate in choked Conditions. This is an important result that will help in the optimum design of this type of nozzles.

A. B. Parry - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic theory of the many-bladed contra-rotating propeller: physics of the wake interaction noise critical sources
    Journal of Fluid Mechanics, 2019
    Co-Authors: A. B. Parry, Michael Kingan
    Abstract:

    In the theory of interaction noise from contra-rotating propellers with many blades, the usual far-field radiation formulae can be re-cast as a double integral, over a source surface, which can be evaluated asymptotically solely in terms of the contributions from critical points. The paper shows that these critical points have a particularly interesting physical meaning. They relate to locations on an event line, running between hub and tip, that represent the locus of the wake–blade interactions at a fixed point in time. The event line rotates at the speed of the spinning interaction tone but does not coincide with the radial variation in either the wake location or the rear blade leading edge. At the precise critical locations on the event line, it is shown that the Mach number of the event line is unity in the direction of the observer (the Sonic Condition) and the tangent to the event line – at a fixed time – is normal to a line drawn between it and the observer (the normal-edge Condition). The zero-mode case is also considered, for which we show that, even though the event line rotates at infinite speed, there can still exist locations that satisfy the Sonic and normal-edge Conditions. The paper also discusses the physical meaning of the lower-order boundary solutions from the hub and tip.

Felix Barreras - One of the best experts on this subject based on the ideXlab platform.

  • design optimization of twin fluid atomizers with an internal mixing chamber for heavy fuel oils
    Fuel Processing Technology, 2009
    Co-Authors: German Ferreira, Antonio Lozano, Felix Barreras, Juan Antonio Garcia, Eduardo Lincheta
    Abstract:

    The present work is devoted to determine the magnitude of the main parameters that yield the optimum results for twin-fluid nozzles with an internal mixing chamber. The focus is placed on the study of the interaction of both air and liquid flows at the internal chamber and its effects on the resulting spray. To this end, some experiments have been performed for different air central channel diameters and liquid ports, as well as for several experimental Conditions (air and liquid mass flow rates), in order to understand the influence of the flow Conditions at the mixing chamber on the size of the droplets produced. It has been demonstrated that under certain experimental Conditions the atomizing fluid discharged to the internal chamber is choked. The Sonic Condition is achieved for different air and liquid mass flow rates as a function of the air central channel diameter. It has also been obtained that to achieve the best results with moderate atomizing fluid flow rates, it is convenient to operate in choked Conditions. This is an important result that will help in the optimum design of this type of nozzles.