Unsteady flow field measurements using LDV

  • 72 Pages
  • 1.73 MB
  • English
ContributionsBodapati, Satyanarayna
The Physical Object
Pagination72 p.
ID Numbers
Open LibraryOL25500564M

Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection Unsteady flow field measurements using LDV.

Hedrick, Steven Dale. Unsteady flow field measurements using LDV. By Steven D. Hedrick. Download PDF (4 MB) Abstract. Approved for public release; distribution is unlimitedThe primary goal of this thesis was the development of an experimental technique, and supporting software, for the acquisition and analysis of unsteady velocity data generated by an oscillating Author: Steven D.

Unsteady flow field measurements using LDV book. Unsteady flow field measurements using LDV (Laser Doppler Velocimetry) Hedrick, Steven D.

Abstract. The primary goal of this thesis was the development of an experimental technique, and supporting software, for the acquisition and analysis of unsteady velocity data Unsteady flow field measurements using LDV book by an oscillating airfoil.

This research was in support of a major Author: Steven D. Hedrick. The two-dimensional steady and unsteady flow field at midspan in a turbine rotor has been investigated experimentally using an LDV with an emphasis on the interaction of the nozzle wake with the rotor flow field.

The velocity measurements are decomposed into a time-averaged velocity, a periodic velocity component and an unresolved velocity component. The two-dimensional steady and unsteady flow field at midspan in an axial flow turbine rotor has been investigated experimentally using an LDV with emphasis on the interaction of the nozzle wake with the rotor flow field.

The flow field in the rotor passage is presented in Part I, while the flow field downstream of the rotor is presented in Part II. Measurements were acquired at 37 axial locations. Dynamic pressure pulsation and Laser Doppler Velocimetry (LDV) measurements have been carried out on the spherical casing wall and internal flow of the RCP under different operating conditions.

Based on the pressure pulsation measurement, it is convinced that different unsteadiness flow structures directly affect the pressure pulsation characteristics, which will generate various.

Flow field study in a bulb turbine runner using LDV and endoscopic S-PIV measurements. S Lemay 1, R Fraser 1, G D Ciocan 1, V Aeschlimann 1 and C Deschênes 1.

Published under licence by IOP Publishing Ltd IOP Conference Series: Earth and Environmental Science, Vol Computational and Experimental Techniques. city field and investigated the correlation between the flushing events and large scale TOS over the block array. Reynolds and Castro () measured flow field within and above a staggered cubical array based on PIV and laser-Doppler velocimetry (LDV), and investigated the features of turbulent statistics.

Journals & Books; Help Download PDF Download. Advanced. Experimental Thermal and Fluid Science. Vol Issues 1–2, May–JunePages Measurement of unsteady flow and turbulence in a low speed axial compressor. Author links open overlay panel A. This paper reports an experimental study of the three-dimensional unsteady flow field due to rotor-stator interaction in the tip region of an axial compressor stator passage.

Details Unsteady flow field measurements using LDV EPUB

The measurements were conducted on a low-speed large-scale axial compressor using a 3-component Laser Doppler Velocimetry. Downstream three-component laser-Doppler velocimetry surveys were conducted at three streamwise stations to map the location and velocity characteristics of the wake and vortex system.

Three-Dimensional Flow Field Measurements in a Radial Inflow Turbine Scroll Using LDV Flow Structure and Unsteady Behavior of Hub-Corner Separation in a. The numerical results for the first case (a model-size pump) are validated against LDV measurements. The flow field is investigated to provide deep understanding of the hydrodynamic phenomena.

The periodically unsteady flow fields in a low specific speed radial diffuser pump have been investigated both numerically and experimentally for the design condition (Q des) and also one part-load condition ( Q des) ⁠.Three-dimensional, unsteady Reynolds-averaged Navier–Stokes equations are solved on high-quality structured grids with the shear stress transport turbulence model by.

Books. AIAA Education Series; Library of Flight; Progress in Astronautics and Aeronautics; The Aerospace Press; Browse All Books; Meeting Papers; Standards; Other Publications. Aerospace Sciences Meetings Home; No Access. Steady and unsteady flow field measurements within a NASA 22 inch fan model.

In an earlier paper in this journal (Mocikat et al. in Exp Fluids –, ) LDV measurements in a simple geometry but for a complex flow have been provided as a database for CFD. Flow field survey has been performed upstream and downstream the propeller by using Laser Doppler Velocimetry (LDV).

the velocity field at any measurement point is a periodic function of time with blade frequency. â Hydrodynamic Analysis of Propellers in Unsteady Flow Using a Surface Panel Methosâ, Journal of the Society of Naval.

Unsteady flow motions were observed by experimental visualisation of the particle flow, and the computed velocity field shows strong unsteady interfacial movement during inward flow. These unsteady flow motions are related to clockwise and counterclockwise vortices on the weld pool surface, which in turn affect both mass flow and energy transport.

The unsteady flow field of an axial-flow turbine rotor was investigated experimentally using an LDV system. Detailed measurements of the time-averaged and time-dependent distributions of the velocity, the flow angle, and the turbulence intensity were carried out.

The midspan rotor flow field was measured using a two-component LDV. Measurements were made from upstream of the rotor to a chord behind the rotor.

The distortion of the nozzle wake as it passed through the rotor blade row was determined. The unsteadiness in the rotor flow field was determined. The decay of the rotor wake was also characterized. In addition to the research water tunnel, NUWC made available both LDV and PIV measurement tools for use on this project (Figure 2).

LDV was used to accurately measure the mean flow velocity at a single interrogation point over a large number of flapping periods, as. Books Committees EDGE Research Reports Events Journals Magazines Training Topics. Airflow Visualization and LDV Measurements in a Motored Rotary Engine Assembly Part 1: Flow Visualization.

Technical Paper. ISSN:e-ISSN: The accuracy and detail is similar to that of LDV, whereas the measurements at multiple points are simultaneous, and hence provide new flow information such as vorticity, strain rates, etc.

The ability of the technique to quantitatively visualize the flow is a definite advantage in understanding complex flows. Books.

AIAA Education Series; “ Feedback Control of Unstable Steady States of Flow past a Flat Plate Using Reduced-Order Estimators,” Journal of Fluid Lagor F., Kirk P.

Description Unsteady flow field measurements using LDV PDF

B., Lind A., Jones A. and Paley D. A., “ Unsteady DMD-Based Flow Field Estimation from Embedded Pressure Sensors in an Actuated Airfoil,” AIAA Scitech. Analysis of vortical flow field in a propeller fan by LDV measurements and LES—Part II: Unsteady nature of vortical flow structures due to tip vortex breakdown.

Journal of Fluids Engineering, Transactions of the ASME, (4), The main features of the propeller flow field are highlighted as well as the strong and complex interactions between the propeller itself and the hull wake.

1 Introduction The accurate analysis and knowledge of the propeller flow field in a non uniform inflow has a fundamental role in the naval field due to the fact that the propeller j.

Reliable bridge scour data for flood events are limited. In this study, field experiments were performed at the Si-Lo Bridge in the lower Cho-Shui River, the longest river in Taiwan, to collect scour-depth data using a sliding magnetic collar, a steel rod, and a numbered-brick column.

three component LDV provides data on velocity, turbulent kinetic energy and flow angle from single positions in the flow field. In this publication a two-component LDV system is used to record unsteady flow data from a 1½ stage cold-flow axial turbine for different stator-stator positions (clocking positions).

LECTURES IN ELEMENTARY FLUID DYNAMICS: Physics, Mathematics and Applications J.

Download Unsteady flow field measurements using LDV PDF

McDonough Departments of Mechanical Engineering and Mathematics. UNSTEADY VELOCITY MEASUREMENTS IN A JET USING A LASER DOPPLER VELOCIMETER Objective In this lab, you will learn the basic principles of laser Doppler velocimetry – which is a standard technique for measuring instantaneous, spatially resolved flow velocities.

You will then use a laser Doppler velocimeter to explore the flowfield of a jet in a. dimensionality of the flow in the measurement region. The flow on the surface was allowed to transition naturally. Data Acquisition Flow-field velocity measurements were made using a 2D, Digital Particle Image Velocimetry (DPIV) system, which consisted of a single, high-resolution, video camera with a sensor size of pixels by.

capabilities to predict unsteady flow fields of synthetic jets and separation control. This paper describes the characteristics and flow field database of a synthetic jet in a quiescent fluid.

In this experiment, Particle Image Velocimetry (PIV), Laser Doppler Velocimetry (LDV), and hot-wire anemometry were used to measure the jet velocity field.Fiber optics LDA and laser knife simultaneous use for flow investigation p.

LDV study of a buoyant exchange flow through a vertical tube p. Optical fiber LDA offering high resolution and relatively long working distance p. Flow-field characteristics around heated buildings p. Laser Doppler Velocimetry (LDV), an unobtrusive measuring technique, was used to quantify the flow field characteristics that were observed during flow visualization.

The observed dye traces were compared to visualization techniques used earlier and with results of an unsteady simulation of flow around a circular cylinder.