Flow Measurements in a Turbine Scroll

1980 ◽  
Vol 102 (3) ◽  
pp. 290-296 ◽  
Author(s):  
W. Tabakoff ◽  
Y. Sheoran ◽  
K. Kroll
Keyword(s):  
Flow Velocity ◽  
Flow Behavior ◽  
Flow Measurements ◽  
Radial Inflow Turbine ◽  
Hot Film ◽  
Hot Film Anemometry

A study was conducted to determine experimentally the flow behavior in the combined scroll nozzle assembly of a radial inflow turbine. Hot film anemometry technique was used to measure the flow velocity in the scroll.

scholarly journals Three-Dimensional Flow Measurements in a Turbine Scroll

1984 ◽  
Vol 106 (2) ◽  
pp. 516-522 ◽  
Author(s):  
W. Tabakoff ◽  
B. V. R. Vittal ◽  
B. Wood
Keyword(s):  
Flow Velocity ◽  
Secondary Flow ◽  
Flow Behavior ◽  
Three Dimensional ◽  
Three Dimensional Flow ◽  
Flow Measurements ◽  
Dimensional Flow ◽  
Through Flow ◽  
Hot Film ◽  
Hot Film Anemometry

A study was conducted to determine experimentally the flow behavior in combined scroll nozzle assembly of a radial inflow turbine. Hot film anemometry technique was used to measure the three-dimensional flow velocity in the scroll. The through-flow and secondary flow velocity components are measured at various points in three scroll sections.

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.

Non-Steady Flow Measurements Inside a Hydrodynamic Torque Converter by Hot-Film Anemometry

1992 ◽  
Author(s):  
V. Browarzik ◽  
K. G. Grahl
Keyword(s):  
Flow Field ◽  
Steady Flow ◽  
Torque Converter ◽  
Operating Conditions ◽  
Measuring System ◽  
Pump Impeller ◽  
Flow Measurements ◽  
First Results ◽  
Hot Film ◽  
Hot Film Anemometry

The overall-characteristics of hydrodynamic torque converters have been discussed often, although there is little knowledge about the flow field inside the circuit. During former investigations at our institute flow measurements have been made and a CFD-program was developed to calculate the flow through the guide vanes and the pump impeller. Our present studies now examine the non-steady flow field at the inlet and outlet of the pump and the turbine impeller by means of hot-film anemometry and a computer based measuring system. The measuring techniques have been developed and now measurements are made at different operating points. Later the measurements will be performed with special regard to non-steady changes of operating conditions. The paper describes the test facilities, the measuring equipment and the techniques used to evaluate the measured data. First results of test measurements are presented.

Numerical and Experimental Investigation of an Aerodynamically High-Loaded Axial Boiler Fan

2000 ◽  
Author(s):  
A. Reischke ◽  
M. Jung ◽  
P. Breuhaus ◽  
J. Molin ◽  
S. Hess
Keyword(s):  
Flow Field ◽  
Guide Vane ◽  
Flow Behavior ◽  
Fast Response ◽  
Turnaround Time ◽  
Design System ◽  
Viscous Effects ◽  
Wide Range ◽  
Hot Film ◽  
Hot Film Anemometry

In a common project ABB Fläkt Industri AB, Sweden, and ABB Turbo Systems Ltd., Switzerland, developed a Q3D design system for low Mach number axial fans. In order to validate the Q3D-calculations and the customized loss correlation, the flow field of an industrial high-pressure boiler fan was investigated experimentally. The examined single stage fan is equipped with hydraulically adjustable rotor blades, non-profiled guide vanes and an annular diffuser. Varying the stagger angle between 34° and 76° allows operating the fan over a wide range of volume flows. Experiments and calculations cover the entire stable operating range. Flow field traverses by means of hot film anemometry and pneumatic total pressure Kiel probes at different sections within the rotor/vane configuration, combined with axially and tangentially distributed static pressures tabs and fix mounted Kiel probes, allowed a deep insight in the flow behavior. The fast response capability of the hot film anemometry was used to measure the flow field downstream of the rotor in detail. Additionally, flow field visualizations inside the guide vane channel based upon a TiO4/Oil-paint technique completed the experimental fan investigation. The Q3D system is based on coupling the Euler codes MISES (S1) and MTFlow (S2), both developed at MIT. Loss models were implemented to account for profile losses, leakage losses and endwall losses. Near wall viscous effects are considered by boundary layer modeling. The investigations show that the S1/S2 Euler solvers behave well even in case of Mach numbers below 0.03. S1 convergence problems arise for off-design cases because of unfavorable incidence angles. The fully automated Q3D systems allows calculating fan performance charts with low turnaround time in good agreement with the measurement.

Investigation of the influence of the flow structure on the accuracy of flow measurement before a hydrometric structure in an open channel

2020 ◽  
pp. 41-44
Author(s):  
Anatoly Kusher
Keyword(s):  
Velocity Profile ◽  
Flow Velocity ◽  
Water Flow ◽  
Flow Measurement ◽  
Water Discharge ◽  
Critical Depth ◽  
Flow Measurements ◽  
Study Results ◽  
Flow Velocity Profile ◽  
Upstream Flow

The reliability of water flow measurement in irrigational canals depends on the measurement method and design features of the flow-measuring structure and the upstream flow velocity profile. The flow velocity profile is a function of the channel geometry and wall roughness. The article presents the study results of the influence of the upstream flow velocity profile on the discharge measurement accuracy. For this, the physical and numerical modeling of two structures was carried out: a critical depth flume and a hydrometric overfall in a rectangular channel. According to the data of numerical simulation of the critical depth flume with a uniform and parabolic (1/7) velocity profile in the upstream channel, the values of water discharge differ very little from the experimental values in the laboratory model with a similar geometry (δ < 2 %). In contrast to the critical depth flume, a change in the velocity profile only due to an increase in the height of the bottom roughness by 3 mm causes a decrease of the overfall discharge coefficient by 4…5 %. According to the results of the numerical and physical modeling, it was found that an increase of backwater by hydrometric structure reduces the influence of the upstream flow velocity profile and increases the reliability of water flow measurements.

Measurement of wall shear stress in physiological pulsatile flows by flush-mounted hot film anemometry

1988 ◽  
Vol 16 (2) ◽  
pp. 235-238
Author(s):  
Subhashis Nandy ◽  
Alex Yefim Bekker ◽  
Gregory Allen Winchell ◽  
John Francis O'Riordan
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Pulsatile Flows ◽  
Wall Shear ◽  
Hot Film ◽  
Hot Film Anemometry

An Experimental Study of Mist/Air Film Cooling With Fan-Shaped Holes on an Extended Flat Plate—Part II: Two-Phase Flow Measurements and Droplet Dynamics

2017 ◽  
Vol 140 (4) ◽  
Author(s):  
Reda Ragab ◽  
Ting Wang
Keyword(s):  
Flow Behavior ◽  
Data Rate ◽  
Main Flow ◽  
Shear Stresses ◽  
Two Phase ◽  
Flow Measurements ◽  
Droplet Dynamics ◽  
Mist Flow ◽  
Film Layer ◽  
Upper Boundary

A phase Doppler particle analyzer (PDPA) system is employed to measure the two-phase mist flow behavior including flow velocity field, droplet size distribution, droplet dynamics, and turbulence characteristics. Based on the droplet measurements made through PDPA, a projected profile describing how the air–mist coolant jet flow spreads and eventually blends into the hot main flow is prescribed for both cylindrical and fan-shaped holes. The mist film layer consists of two layers: a typical coolant film layer (cooling air containing the majority of the droplets) and a wider droplet layer containing droplets outside the film layer. Thanks to the higher inertia possessed by larger droplets (>20 μm in diameter) at the injection hole, the larger droplets tend to shoot across the coolant film layer, resulting in a wider droplet layer than the coolant film layer. The wider droplet layer boundaries are detected by measuring the droplet data rate (droplet number per second) distribution, and it is identified by a wedge-shaped enclosure prescribed by the data rate distribution curve. The coolant film layer is prescribed by its core and its upper boundary. The apex of the data rate curve, depicted by the maximum data rate, roughly indicates the core region of the coolant film layer. The upper boundary of the coolant film layer, characterized by active mixing with the main flow, is found to be close to relatively high values of local Reynolds shear stresses. With the results of PDPA measurements and the prescribed coolant film and droplet layer profiles, the heat transfer results on the wall presented in Part I are re-examined, and the fundamental mist-flow physics are analyzed. The three-dimensional (3D) droplet measurements show that the droplets injected from the fan-shaped holes tend to spread wider in lateral direction than cylinder holes and accumulate at the location where the neighboring coolant film layers meet. This flow and droplet behavior explain the higher cooling performance as well as mist-enhancement occurs between the fan-shaped cooling holes, rather than along the hole's centerline as demonstrated in the case using the cylindrical holes.

Control of Hemorrhage in Critical Femoral or Inguinal Penetrating Wounds—An Ultrasound Evaluation

2006 ◽  
Vol 21 (6) ◽  
pp. 379-382 ◽  
Author(s):  
Michael Blaivas ◽  
Stephen Shiver ◽  
Matthew Lyon ◽  
Srikar Adhikari
Keyword(s):  
Flow Velocity ◽  
Abdominal Aorta ◽  
Femoral Artery ◽  
Iliac Artery ◽  
Common Femoral Artery ◽  
Body Armor ◽  
Mean Flow ◽  
Mean Velocity ◽  
Flow Measurements ◽  
Ultrasound Evaluation

AbstractIntroduction:Exsanguination from a femoral artery wound can occur in sec-onds and may be encountered more often due to increased use of body armor. Some military physicians teach compression of the distal abdominal aorta (Abdominal Aorta) with a knee or a fist as a temporizing measure.Objective:The objective of this study was to evaluate if complete collapse of the Abdominal Aorta was feasible and with what weight it occurs.Methods:This was a prospective, interventional study at a Level-I, academ-ic, urban, emergency department with an annual census of 80,000 patients. Written, informed consent was obtained from nine male volunteers after Institutional Research Board approval. Any patient who presented with abdominal pain or had undergone previous abdominal surgery was excluded from the study. Subjects were placed supine on the floor to simulate an injured soldier. Various dumbbells of increasing weight were placed over the distal Abdominal Aorta, and pulsed-wave Doppler measurements were taken at the right common femoral artery (CFA). Dumbbells were placed on top of a tightly bundled towel roughly the surface area of an adult knee. Flow measurements at the CFA were taken at increments of 20 pounds. This was repeated with weight over the proximal right artery iliac and distal right iliac artery to eval- uate alternate sites. Descriptive statistics were utilized to evaluate the data.Results:The mean velocity through the CFA was 75.8 cm/ sec at 0 pounds. Compression of the Abdominal Aorta ranging 80 to 140 pounds resulted in no flow in the CFA. A steady decrease in mean flow velocity was seen starting with 20 pounds. Flow velocity decreased more rapidly with compression of the prox- imal right iliac artery, and stopped in all nine volunteers by 120 pounds of pressure. For all nine volunteers, up to 80 pounds of pressure over the distal iliac artery failed to decrease CFA flow velocity, and no subject was able to tolerate more weight at that location.Conclusion:Flow to the CFA can be stopped completely with pressure over the distal Abdominal Aorta or proximal iliac artery in catastrophic wounds. Compression over the proximal iliac artery worked best, but a first responder still may need to apply upward of 120 pounds of pressure to stop exsanguination.

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