New solid particle seeding generator for laser-based velocity measurements in reacting flows

The design of a new solid particle seeding generator for laser-based velocity measurements in gaseous flows is reported. Performance tests revealed that the new seeder has the ability to control the concentration of seeding particles in a flow independently of the flowrate. It also can provide a steady supply of seeding particles, operate over an extended range of flowrate, and break up agglomerates into smaller particles. These features give this seeder advantages over its counterparts, especially at low volumetric flowrate.

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The Effect of Inlet Distortion on the Performance Characteristics of a Centrifugal Compressor

Journal of Engineering for Power ◽

10.1115/1.3227406 ◽

1983 ◽

Vol 105 (2) ◽

pp. 223-230 ◽

Cited By ~ 16

Author(s):

I. Ariga ◽

N. Kasai ◽

S. Masuda ◽

Y. Watanabe ◽

I. Watanabe

Keyword(s):

Centrifugal Compressor ◽

Total Pressure ◽

Performance Characteristics ◽

Performance Tests ◽

Velocity Measurements ◽

Test Rig ◽

Low Speed ◽

Inlet Distortion ◽

Surge Margin ◽

The Given

The present paper concerns itself with the effects of total pressure (and thus velocity) distortion on performance characteristics and surge margin of centrifugal compressors. Both radial and circumferential distortions were investigated. The performance tests as well as the velocity measurements within the impeller passages were carried out with a low-speed compressor test rig with the inlet honeycomb as the distortion generators and compared with the case of “no distortion” as a datum. The results indicated that the inlet distortion exerted unfavorable influences on the efficiency and the surge margin of the given compressor, though the influence of the radial distortion was much stronger than that of the circumferential one. Various distortion indices were further examined in order to correlate the performance to the inlet distortion.

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The Effect of Inlet Distortion on the Performance Characteristics of a Centrifugal Compressor

Volume 1: Turbomachinery ◽

10.1115/82-gt-92 ◽

1982 ◽

Cited By ~ 2

Author(s):

I. Ariga ◽

N. Kasai ◽

S. Masuda ◽

Y. Watanabe ◽

I. Watanabe

Keyword(s):

Centrifugal Compressor ◽

Total Pressure ◽

Performance Characteristics ◽

Performance Tests ◽

Velocity Measurements ◽

Test Rig ◽

Low Speed ◽

Inlet Distortion ◽

Surge Margin ◽

The Given

The present paper concerns itself with the effects of total pressure (and thus velocity) distortion on performance characteristics and surge margin of centrifugal compressors. Both radial and circumferential distortions were investigated. The performance tests as well as the velocity measurements within the impeller passages were carried out with a low speed compressor test rig with the inlet honeycomb as the distortion generators and compared with the case of “no distortion” as a datum. The results indicated that the inlet distortion exerted unfavorable influences on the efficiency and the surge margin of the given compressor, though the influence of the radial distortion was much stronger than that of the circumferential one. Various distortion indices were further examined in order to correlate the performance to the inlet distortion.

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Velocity Measurements in Gaseous Flows Using MTV

Journal of the Visualization Society of Japan ◽

10.3154/jvs.32.26 ◽

2012 ◽

Vol 32 (125) ◽

pp. 26-31

Author(s):

Taro HANDA ◽

Sosuke MIZUTA ◽

Kohei IMAMURA

Keyword(s):

Velocity Measurements ◽

Gaseous Flows

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Hot-Wire Anemometry for Velocity Measurements in Nanopowder Flows

Journal of Fluids Engineering ◽

10.1115/1.3077140 ◽

2009 ◽

Vol 131 (3) ◽

Cited By ~ 2

Author(s):

Sergey P. Bardakhanov ◽

Sang W. Joo

Keyword(s):

Vertical Channel ◽

Field Measurements ◽

Hot Wire ◽

Velocity Measurements ◽

Flow Measurements ◽

Chute Flow ◽

Test Platform ◽

Hot Wire Anemometry ◽

Gaseous Flows ◽

A New Technique

A new technique for velocity-field measurements in fine granular systems is introduced. The hot-wire anemometry, mainly used for gaseous flows, is applied to nanopowders and is found to be a viable experimental method for flow measurements. A generic chute flow of aluminum oxide C and Aerosil A-90 and A-380 powders through a vertical channel is chosen as a test platform, and the results suggest that the hot-wire anemometry is a favorable option for nanopowder measurements.

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A loss analysis based on experimental data for a 99.0 mm radial inflow nozzled turbine with different stator throat areas

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

10.1243/0957650981536718 ◽

1998 ◽

Vol 212 (1) ◽

pp. 27-42 ◽

Cited By ~ 10

Author(s):

D W Artt ◽

S W T Spence

Keyword(s):

Step Change ◽

Performance Tests ◽

Nozzle Throat ◽

Flow Rates ◽

Experimental Performance ◽

Loss Analysis ◽

Significant Step ◽

Rotor Losses ◽

Rotor Loss ◽

Volumetric Flowrate

The results of experimental performance tests on a 99.0 mm radial inflow turbine with seven different nozzle throat areas were reported by the same authors in a previous publication (1). In order to perform a loss analysis, dividing the turbine losses between the stator and the rotor, a theoretical model of the stator loss was required. Several stator loss models were evaluated and the model described by Rohlik (9) was used as the basis for a loss analysis. Plots are given for the breakdown of losses at two operating speeds for each nozzle size. Both the stator and the rotor losses decreased markedly as the stator throat area increased towards a stator-rotor throat area ratio of 0.5. A significant step change in the magnitude of the rotor loss was evident at every stator size and appeared to correlate with the volumetric flowrate in the turbine exducer. Therefore a transition to a more efficient flow pattern in the exducer seemed to occur at higher flow-rates.

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