FLOW VORTEX STRUCTURE CONTROL PAST A BODY BY CHANGING ITS SHAPE AND ANGULAR POSITION

An experimental study of the effect of wake disturbance frequency on the secondary flow vortices in a two-dimensional linear cascade is presented. The flow Reynolds numbers, based on exit velocity and suction side surface length were 25,000, 50,000 and 85,000. Secondary flow was visualized by injecting smoke into the boundary layer and illuminating it with a laser light sheet located at the exit of the cascade. To simulate wakes from upstream blade rows, a set of spanwise cylinders were traversed across the front of the blade row. The flow visualization results with a single wake disturbance reveal that the recovery time of the secondary flow vortex structure decreases as the wake traverse velocity is increased. The results of flow visualization with multiple wakes showed that wake disturbance frequencies below the axial chord flow frequency allowed complete recovery of the secondary flow vortex structure before the next wake encounters the blade leading edge. Wake disturbance frequencies that exceeded the axial chord flow frequency resulted in no observable recovery of the secondary flow vortex structure. Axial chord flow frequency is defined as the axial velocity in the cascade divided by the axial chord length of the turbine blade. [S0098-2202(00)02203-3]

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Integral Slide Mode Variable Structure Control of the Machine Angular Position Servo System with Friction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.138-139.263 ◽

2011 ◽

Vol 138-139 ◽

pp. 263-266 ◽

Cited By ~ 4

Author(s):

Xu Gang Wang ◽

Xin Hua Li

Keyword(s):

Tracking Error ◽

Angular Position ◽

Variable Structure Control ◽

Servo System ◽

Variable Structure ◽

Friction Model ◽

Structure Control ◽

Result Show ◽

Position Servo ◽

The One

In order to lighten the disadvantageous effect of the friction on the machine angular position servo system, the controller is designed using the variable structure control with integral slide mode. The mathematical model of the machine servo system is built with Stribeck friction model. The integral slide mode function includes tracking error and the integral of the tracking error. The one order differential equation of the slide mode is a second-order linear model. In order to alleviate the chattering, the saturation function replaces the sign function. The simulation result show the tracking precision is high and the controller output has not obvious chattering. The controller meets the tracking precision of the machine angular position servo system.

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Cross-flow vortex structure and transition measurements using multi-element hot films

10.2514/6.1991-166 ◽

1991 ◽

Cited By ~ 2

Author(s):

NAVAL AGARWAL ◽

SIVA MANGALAM ◽

DAL MADDALON ◽

FAYETTE COLLIER, JR.

Keyword(s):

Vortex Structure ◽

Cross Flow ◽

Flow Vortex

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Vortex Structure in Abelian-Projected Lattice Gauge Theory

Nuclear Physics B - Proceedings Supplements ◽

10.1016/s0920-5632(00)00261-9 ◽

2000 ◽

Vol 83-84 (1-3) ◽

pp. 467-469 ◽

Cited By ~ 1

Author(s):

J AmbjÃ¸rn

Keyword(s):

Gauge Theory ◽

Vortex Structure ◽

Lattice Gauge Theory ◽

Lattice Gauge

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Carborane–Siloxanes: Synthesis and Properties. New Possibilities for Structure Control

INEOS OPEN ◽

10.32931/io1806r ◽

2018 ◽

Vol 1 (2) ◽

pp. 71-84 ◽

Cited By ~ 10

Author(s):

A. A. Anisimov ◽

◽

A. V. Zaitsev ◽

V. A. Ol'shevskaya ◽

M. I. Buzin ◽

...

Keyword(s):

Structure Control

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ANALISIS VARIASI JUMLAH SUDU TURBIN BERPENAMPANG PELAT DATAR PADA TURBIN AIR ALIRAN VORTEX DENGAN TIPE SALURAN MASUK INVOLUTE

JURNAL ILMIAH TEKNIK MESIN ◽

10.33558/jitm.v7i2.1917 ◽

2020 ◽

Vol 7 (2) ◽

pp. 72-78

Author(s):

Adnan Al Farisi ◽

Yopi Handoyo ◽

Taufiqur Rokhman

Keyword(s):

Power Plant ◽

Alternative Energy ◽

Vortex Flow ◽

Experimental Methods ◽

Turbine Efficiency ◽

A Value ◽

Current Voltage ◽

Materials Research ◽

The One ◽

Flow Vortex

The One of alternative energy that is environmentally friendly is by untilize water energy and turn it into a Microhydro power plant. Microhydro power plant usually made from utilize the waterfall with the head fell. While utilization for streams with a head small drop is not optimal yet. This is a reference to doing research on harnessing the flow of a river that has a value of head low between 0.7 m – 1.4 m with turning it into a Vortex flow (vortex). The purpose of this research is to know the effect variation number of blade on power and efficiency in the vortex turbine. This research uses experimental methods to find current, voltage, torque and rpm using a reading instrument. The materials research vortex turbine used 6 blade, 8 blade and 10 blade with flat plate. The result showed the highest efficiency is 29,93 % with produce turbine power is 19,58 W, generated on turbine with variation 10 blade with load 3,315 kg and the capacity of water 10,14 l/s. Followed with an efficiency 24,17% and produce turbine power is 15,81 W, generated on turbine with the variation 8 blade with load 3,315 kg and the capacity of water is 10,14 l/s. The the lowest turbine efficiency 22,32% with produce tuebine power 14,60 W, generated on turbine with the variation 6 blade with load 3,315 kg, the capacity of water is 10,14 l/s.

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