scholarly journals Do internal flow measurements improve the calibration of rainfall-runoff models?

2012 ◽  
Vol 48 (2) ◽  
Author(s):  
J. Lerat ◽  
V. Andréassian ◽  
C. Perrin ◽  
J. Vaze ◽  
J. M. Perraud ◽  
...  
Keyword(s):  
Internal Flow ◽  
Rainfall Runoff ◽  
Flow Measurements

Passive Control of Unstable Characteristics of a High Specific Speed Diagonal-Flow Fan by an Annular Wing

1990 ◽  
Author(s):  
Kenji Kaneko ◽  
Toshiaki Setoguchi ◽  
Masahiro Inoue
Keyword(s):  
Flow Rate ◽  
Geometrical Parameter ◽  
Energy Input ◽  
Passive Control ◽  
Internal Flow ◽  
Flow Region ◽  
Low Flow ◽  
Performance Tests ◽  
Flow Measurements ◽  
Specific Speed

A passive control of an unstable characteristics of a high specific speed diagonal-flow fan has been proposed. It is possible to eliminate the unstable characteristics of pressure-flow rate curve in a low flow region without deterioration of performance at design point. The control action is done naturally (passively) without any energy input. The inlet nozzle of an ordinary diagonal-flow fan was replaced by an annular wing with Göttingen 625 airfoil section. The mechanism of the passive control and the optimum geometrical parameter are discussed on the basis of the performance tests and internal flow measurements.

Internal flow measurements in pilot scale wet low-intensity magnetic separation

2016 ◽  
Vol 155 ◽  
pp. 55-63 ◽  
Author(s):  
Jan F. Stener ◽  
Johan E. Carlson ◽  
Anders Sand ◽  
Bertil I. Pålsson
Keyword(s):  
Magnetic Separation ◽  
Internal Flow ◽  
Pilot Scale ◽  
Flow Measurements ◽  
Low Intensity

scholarly journals Experimental Investigation of Rotor/Rotor Interaction in a Hydrodynamic Torque Converter Using Hot-Film Anemometry

1994 ◽  
Author(s):  
Volker Browarzik
Keyword(s):  
Computer Animation ◽  
Internal Flow ◽  
Torque Converter ◽  
Ensemble Averaging ◽  
Pump Impeller ◽  
Flow Measurements ◽  
Turbine Inlet ◽  
Computer Based ◽  
Hot Film ◽  
Hot Film Anemometry

Unsteady flow measurements were performed to investigate the internal flow field of a torque converter, especially unsteady rotor/rotor-interaction in the region between pump exit and turbine inlet. Instantaneous flow data were measured with hot-film probes and a computer based data acquisition system. The commonly used ensemble averaging method was adapted to this special case with two independently rotating impellers. Velocity profiles of the flow in the relative frame of reference of the pump impeller were evaluated and they were used to generate a computer animation. The paper gives an overview over the test facilities and the background of the present investigations. It follows a discussion of some essential aspects concerning the use of hot-film anemometry. The methods used to evaluate the data are described in detail and measuring results of the region between pump exit and turbine inlet are presented.

Effect of Leading Edge Sweep on Cavitation Performance of Two-Bladed Flat Plate Inducer

2011 ◽  
Author(s):  
Takaki Igoshi ◽  
Yuki Uchinono ◽  
Emosi Koroitamana ◽  
Koichi Ishizaka ◽  
Satoshi Watanabe ◽  
...  
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Internal Flow ◽  
Leading Edge ◽  
Pressure Measurements ◽  
Flow Measurements ◽  
Cavitation Performance ◽  
Video Observations ◽  
Flow Rate Range ◽  
Suction Performance

The installation of inducer upstream of main impeller is an effective method to improve the suction performance of turbopump. However, various types of cavitation instabilities are known to occur even at the designed flow rate as well as in the partial flow rate range. In the present study, we focus on the leading edge sweep of inducer and investigate its effect on the suction performance as well as on the onset of cavitation surge phenomenon. Flow measurements including casing wall pressure measurements, high-speed video observations, and limiting streamline observations are carried out, and discussions will be made based on those results about the influence of backward leading edge sweep on the internal flow of the inducer as well as its relation to the cavitation performance.

Internal flow measurements of drop impacting a solid surface

2017 ◽  
Vol 58 (3) ◽  
Author(s):  
S. Santosh Kumar ◽  
Ashish Karn ◽  
Roger E. A. Arndt ◽  
Jiarong Hong
Keyword(s):  
Solid Surface ◽  
Internal Flow ◽  
Flow Measurements

Characterization of Flow Through Porous Metals

2013 ◽  
Author(s):  
Michael J. Hargather ◽  
Karen A. Thole
Keyword(s):  
Pressure Drop ◽  
Compressible Flow ◽  
Internal Flow ◽  
Porous Metal ◽  
Effective Diameter ◽  
Porous Metals ◽  
Flow Area ◽  
Flow Measurements ◽  
Flow Through

Porous metals have long been considered as an ideal material in which to manufacture turbine components given the inherent large convective surface area. One consideration, however, in using porous metals is the increase in pressure drop that accompanies these materials. To characterize increases in pressure drop for porous materials, flow measurements were made on numerous porous metal coupons. The porosity of the coupons investigated had a range of four in terms of density. A technique for determining the effective internal flow area from pressure drop measurements was developed to provide an effective diameter. The pressure drop measurements were compared to an ideal isentropic compressible-flow nozzle and to a smooth, straight-walled tube. The comparisons show that the porous channels have a similar, but much larger pressure drop than the smooth walls. The experiments performed demonstrated that these porous geometries can be scaled to provide generalized pressure drop characteristics for all geometries.

Detailed Flow Measurements and Predictions for a Three-Stage Transonic Fan

1994 ◽  
Vol 116 (2) ◽  
pp. 298-305 ◽  
Author(s):  
W. J. Calvert ◽  
A. W. Stapleton
Keyword(s):  
Shock Waves ◽  
Computational Efficiency ◽  
Three Dimensional ◽  
Internal Flow ◽  
Design Tool ◽  
Three Dimensional Flow ◽  
Flow Measurements ◽  
Overall Performance ◽  
Calculation System ◽  
Transonic Fan

Detailed flow measurements were taken at DRA Pyestock on a Rolls-Royce three-stage transonic research fan using advanced laser transit velocimetry and holography techniques to supplement the fixed pressure and temperature instrumentation. The results have been compared with predictions using the DRA S1-S2 quasi-three-dimensional flow calculation system at a range of speeds. The agreement was generally encouraging, both for the overall performance and for details of the internal flow such as positions of shock waves. Taken together with the computational efficiency of the calculations and previous experience on single-stage transonic fans and core compressors, this establishes the S1-S2 system as a viable design tool for future multistage transonic fans.

scholarly journals Internal flow measurements of the SSME fuel preburner injector element using real time neutron radiography

1990 ◽  
Author(s):  
JOHN LINDSAY ◽  
SANDY ELAM ◽  
TED KOBLISH ◽  
PHIL LEE ◽  
DAVE MCAULIFFE
Keyword(s):  
Real Time ◽  
Neutron Radiography ◽  
Internal Flow ◽  
Flow Measurements

scholarly journals Stability of Conical and Curved Annular Diffusers for Mixed-Flow Compressors

1987 ◽  
Author(s):  
A. Abir ◽  
A. Whitfield
Keyword(s):  
Internal Flow ◽  
Wall Pressure ◽  
Hot Wire ◽  
Vaneless Diffuser ◽  
Mixed Flow ◽  
Flow Measurements ◽  
Pressure Transducers ◽  
Flow Profiles ◽  
Annular Diffuser ◽  
Unsteady Conditions

For mixed-flow compressors the downstream vaneless diffuser can be either a straight or curved annular passage. Investigations have been carried out on model diffusers six times larger than those employed in a turbocharger study, Whitfield et al (1978). This made it possible to carry out detailed internal flow measurements using a five hole yaw probe and a hot wire anemometer. The development of the flow profiles throughout the diffuser were studied with particular reference to the onset of unstable conditions. Flush mounted wall pressure transducers were also used to detect the onset of unstable flows and to measure the extent and development of the unsteady conditions. Two curved and one straight annular diffusers have been tested in order to study their relative merits. In addition, the results obtained with a straight radial diffuser are included for comparison. It has generally been observed that the straight annular diffuser was the least stable, with the radial diffuser exhibiting the best stability characteristics. Of the two curved annular diffusers tested flow stability was improved by reducing the passage width. In both cases, however, the curved diffuser proved to be clearly superior to the simpler straight design.

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