Axial Outflow Research Articles

Caractérisation des sources de bruit aérodynamique sur un ventilateur centrifuge à flux axial

This paper is an experimental investigation of the aerodynamic noise sources in a centrifugal fan with outlet guide vanes and axial outflow. Special piezoplastic sensors are used for the measurement of the pressure fluctuations on the blades. Classical signal processing procedures provide the blade loadings harmonics. When the fan operates at a relatively high flow rate and low efficiency, it is verified that higher loading harmonics are responsible for the noise emitted at the blade passing frequency. Conversely, at the maximum efficiency, only the first loading harmonic is noticeable, and the tone noise is suppressed

Plasma points and radiative collapse in vacuum sparks

This review discusses the intense x-ray emitting regions, called plasma points, that appear in low-inductance vacuum sparks and other high-current discharges. Accurate x-ray spectroscopy indicates the existence of two types of plasma points with different plasma parameters. One type is extremely small (∼microns), dense (∼1023/cm3), and hot (≳1 keV), while the second type is an order of magnitude less extreme. A dynamic model (Vikhrev 1982a) based on radiation cooling with axial outflow of plasma predicts a radiative collapse that is consistent with many features of the plasma points.

Heat Transfer in Rotating Cylindrical Enclosures With Axial Inflow and Outflow of Coolant

Heat Transfer in Rotating Cylindrical Enclosures With Axial Inflow and Outflow of Coolant

A composite Ekman boundary layer problem

The steady, axially symmetric, viscous, incompressible flow induced by an infinite rotating disk in the presence of a stationary coaxial disk is studied numerically for the complete laminar range of a Taylor number, R . Emphasis is placed on qualitative interpretation of the numerical solutions. The asymptotic state for large R is shown to consist of two well-known special Ekman boundary layers on the disks which are linked by a Taylor column, with Ekman layer suction into one layer just balanced by axial outflow from the other layer. DOI: 10.1111/j.2153-3490.1968.tb00409.x

A composite Ekman boundary layer problem

The steady, axially symmetric, viscous, incompressible flow induced by an infinite rotating disk in the presence of a stationary coaxial disk is studied numerically for the complete laminar range of a Taylor number, R. Emphasis is placed on qualitative interpretation of the numerical solutions. The asymptotic state for large R is shown to consist of two well-known special Ekman boundary layers on the disks which are linked by a Taylor column, with Ekman layer suction into one layer just balanced by axial outflow from the other layer.