scholarly journals Flow control in cavity by means of sDBD actuator

2021 ◽  
Vol 2100 (1) ◽  
pp. 012026
Author(s):  
P N Kazanskii ◽  
I A Moralev ◽  
I V Selivonin
Keyword(s):  
Flow Control ◽  
Flow Velocity ◽  
Pulse Energy ◽  
Modulation Frequency ◽  
Discharge Pulse ◽  
Resonant Modes ◽  
Discharge Operation

Abstract This paper presents results of controlling the hydrodynamic cavity pulsations by plasma sDBD actuators. The study was held at flow velocity 36 m/s. The discharge was organized near the upstream edge of cavity. The discharge pulse energy was 0.03 J, Excitation of resonant modes, whose frequency coincides with the modulation frequency of the discharge, is obtained. Also, in the case of the detuned discharge operation, locking of the cavity to the discharge modulation frequency occurs.

scholarly journals Effects of Using Channelling Devices to Increase Efficiency of Hydrokinetic Devices

2015 ◽  
Vol 52 (2) ◽  
pp. 3-12
Author(s):  
A. Kalnacs ◽  
J. Kalnacs ◽  
A. Mutule ◽  
V. Entins
Keyword(s):  
Flow Control ◽  
Flow Velocity ◽  
Cross Section ◽  
Power Output ◽  
High Importance ◽  
Different Types ◽  
The Cross ◽  
Increase Efficiency ◽  
Flow Velocities

Abstract In the rivers of Latvia and of many other countries the flow velocity in the places that are most suitable for installation of hydrokinetic devices is 0.4 to 0.9 m/s. In a stream or a river the hydrokinetic devices can reach full efficiency starting from about twice higher flow velocities. It is advisable to at least double this velocity thus increasing the efficiency and power output of the hydrokinetic devices installed in such places. Since Latvia has abundance of slow rivers and almost none are fast, research in this field is of high importance. Diversified technical methods are known that allow increasing substantially the efficiency of hydrokinetic devices. These methods include the use of diffusers, concentrators, different types of other channelling devices and means of flow control. Desirable effects are achieved through changing the cross-section and/or direction of a flow, its pressure, minimizing the turbulence, etc. This work substantiates the use of such devices for increasing the efficiency of hydrokinetic devices. A method is proposed for evaluation of the effects on power output gained owing to the use of channelling devices. Results show that the efficiency of hydrokinetic devices can be increased by at least 110%.

Simulation and Intelligent Control of Stratified Flow Control Sink

2014 ◽  
Vol 644-650 ◽  
pp. 171-174
Author(s):  
Lei Rao ◽  
Wei Wei Tao
Keyword(s):  
Flow Control ◽  
Flow Velocity ◽  
Intelligent Control ◽  
Effective Range ◽  
Flow State ◽  
Simulation Data ◽  
Interactive Interface ◽  
Control Of Flow ◽  
Set Up ◽  
Flow States

This article proposes a sink which is multi-circulating stratified control of flow velocity. We research the different effective range of one certain flow state with changing velocity of each layer of the sink and obtain several typical flow states with changing velocity combination There are some changes of effective range between different velocities through studying the different flow states. We can get expected flow states in different combinations. Then we use neutral network and the simulation data to realize the intelligent control and set up a friendly interactive interface.

Influence of the flow velocity on membrane-aerated biofilm reactors: Application of a rotating disk for local flow control

2020 ◽  
Vol 164 ◽  
pp. 107771
Author(s):  
Tadashi Shoji ◽  
Ryuya Itoh ◽  
Tadashi Nittami ◽  
Tatsuto Kageyama ◽  
Miyuki Noguchi ◽  
...  
Keyword(s):  
Flow Control ◽  
Flow Velocity ◽  
Rotating Disk ◽  
Local Flow ◽  
Biofilm Reactors

Material Removal and Fracture Detection in Micro-EDM Processes

2011 ◽  
Vol 462-463 ◽  
pp. 1092-1096 ◽  
Author(s):  
Muslim Mahardika ◽  
Gunawan Setia Prihandana ◽  
Takashi Endo ◽  
Suyitno ◽  
B. Arifvianto ◽  
...  
Keyword(s):  
Pulse Energy ◽  
Electrical Discharge Machining ◽  
Tool Electrode ◽  
Electrode Wear ◽  
Micro Edm ◽  
Micro Machining ◽  
Fracture Detection ◽  
Charge Voltage ◽  
Discharge Pulse ◽  
Micro Electrical Discharge Machining

The important thing in micro-machining is its accuracy. The Micro-Electrical Discharge Machining (micro-EDM) is a promising method in micro-machining, because (1) the process is independent on the hardness of the workpiece but only depends on its thermal conductivity and melting point and (2) it can be used to machine materials with highly complex geometrical shapes using a simple-shaped tool electrode. However, the process in micro-EDM is not totally well-known, especially related to the formation of discharge pulse energy and the fracture phenomena. In the micro-EDM processes, the formation of discharge pulse energy is a complex phenomenon, since it is related to many parameters such as discharge gap, charge voltage, capacitance, and tool electrode wear. In this paper, the Acoustic Emission (AE) sensor is used to detect the changes of discharge pulse energy during machining of brass using micro-EDM. The results shows that the AE signals can detect and explain the fracture phenomena during the micro-EDM processes.

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