Synthetic jet technology is widely adopted in active flow control. An actuator with an oscillating diaphragm a commonly used excitation device for synthetic generation. However, it has disadvantage wherein the volume at cross-section of cavity varies unevenly when vibrates, which makes difficult to use multiple jets corresponding one diaphragm. In this paper, acoustic that can generate was desi...

A turbulent drag-reduction method employing synthetic jet sheets in a channel flow is investigated by direct numerical simulations. The are wall-parallel and produced periodic blowing suction from pairs of thin slots aligned with the main streamwise flow. By varying slot height jet-sheet angle respect to spanwise direction, margins between $10\,\%$ $30\,\%$ obtained for angles $45 ^{\circ }$ $7...

Choosing the right cooling device is crucial for proper operation of electronic equipment. A comparison two different devices presented in this paper: one with a standard axial fan and other synthetic jet actuator. Two distinct sets operating conditions loudspeakers actuator were used. The experimental setup consisted radial heat sink mounted onto round electric heater systems: From thermal bal...

The paper presents the preliminary results of experimental investigation four various loudspeakers used for driving synthetic jet actuator. parameters, characteristic velocity, pressure inside cavity, device sound level (SPL), and heat sink thermal resistance, were presented input power frequency. resonance frequency was determined based on electrical impedance. highest momentum velocity achiev...

In the repetitive approach to the theory of jet bundles there are three methods of repetition, which yield non-holonomic, semi-holonomic, and holonomic jet bundles respectively. However the classical approach to holonomic jet bundles failed to be truly repetitive, for it must resort to such a non-repetitive coordinatedependent construction as Taylor expansion. The principal objective in this pa...

Interest point matching is widely used for image indexing. In this paper we introduce a new distance measure between two local descriptors instead of conventional Mahalanobis distance to improve matching accuracy. From experiments with synthetic images we show that the error distribution of local jet is gaussian but the distribution of the descriptors derived from local jet is not gaussian. Bas...