NDLI: Three-dimensional flow structures and associated turbulence in the tip region of a waterjet pump rotor blade

Content Provider	Springer Nature Link
Author	Wu, Huixuan Tan, David Miorini, Rinaldo L. Katz, Joseph
Copyright Year	2011
Abstract	Stereo particle image velocimetry measurements focus on the flow structure and turbulence within the tip leakage vortex (TLV) of an axial waterjet pump rotor. Unobstructed optical access to the sample area is achieved by matching the optical refractive index of the transparent pump with that of the fluid. Data obtained in closely spaced planes enable us to reconstruct the 3D TLV structure, including all components of the mean vorticity and strain-rate tensor along with the Reynolds stresses and associated turbulence production rates. The flow in the tip region is highly three-dimensional, and the characteristics of the TLV and leakage flow vary significantly along the blade tip chordwise direction. The TLV starts to roll up along the suction side tip corner of the blade, and it propagates within the passage toward the pressure side of the neighboring blade. A shear layer with increasing length connects the TLV to the blade tip and initially feeds vorticity into it. During initial rollup, the TLV involves entrainment of a few vortex filaments with predominantly circumferential vorticity from the blade tip. Being shed from the blade, these filaments also have high circumferential velocity and appear as swirling jets. The circumferential velocity in the TLV core is also substantially higher than that in the surrounding passage flow, but the velocity peak does not coincide with the point of maximum vorticity. When entrainment of filaments stops in the aft part of the passage, newly forming filaments wrap around the core in helical trajectories. In ensemble-averaged data, these filaments generate a vortical region that surrounds the TLV with vorticity that is perpendicular to that in the vortex core. Turbulence within the TLV is highly anisotropic and spatially non-uniform. Trends can be traced to high turbulent kinetic energy and turbulent shear stresses, e.g., in the shear layer containing the vortex filaments and the contraction region situated along the line where the leakage backflow meets the throughflow, causing separation of the boundary layer at the pump casing. Upon exposure to adverse pressure gradients in the aft part of the passage, at 0.65–0.7 chord fraction in the present conditions, the TLV bursts into a broad turbulent array of widely distributed vortex filaments.
Starting Page	1721
Ending Page	1737
Page Count	17
File Format	PDF
ISSN	07234864
Journal	Experiments in Fluids
Volume Number	51
Issue Number	6
e-ISSN	14321114
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-09-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Thermodynamics, Heat and Mass Transfer Engineering Fluid Dynamics Fluid- and Aerodynamics
Content Type	Text
Resource Type	Article
Subject	Fluid Flow and Transfer Processes Physics and Astronomy Mechanics of Materials Computational Mechanics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Blade tip vortex measurements on actively twisted rotor blades

Three-dimensional reconstruction of helicopter blade–tip vortices using a multi-camera BOS system

Aperiodicity in the near field of full-scale rotor blade tip vortices

Measurements of the tip leakage vortex structures and turbulence in the meridional plane of an axial water-jet pump

Three-dimensional, three-component wall-PIV

Three-dimensional flow visualization and vorticity dynamics in revolving wings

Investigation of the tip leakage flow at turbine rotor blades with squealer cavity

Three-dimensional flow structure on a maneuvering wing

Three-dimensional flow structures and unsteady forces on pitching and surging revolving flat plates

Three-dimensional flow structures and associated turbulence in the tip region of a waterjet pump rotor blade

Similar Documents

Blade tip vortex measurements on actively twisted rotor blades

Three-dimensional reconstruction of helicopter blade–tip vortices using a multi-camera BOS system

Aperiodicity in the near field of full-scale rotor blade tip vortices

Measurements of the tip leakage vortex structures and turbulence in the meridional plane of an axial water-jet pump

Three-dimensional, three-component wall-PIV

Three-dimensional flow visualization and vorticity dynamics in revolving wings

Investigation of the tip leakage flow at turbine rotor blades with squealer cavity

Three-dimensional flow structure on a maneuvering wing

Three-dimensional flow structures and unsteady forces on pitching and surging revolving flat plates

Three-dimensional flow structures and associated turbulence in the tip region of a waterjet pump rotor blade