NDLI: Numerical Investigations About the Aerodynamic Performance of the Cascade in Unsteady Environment

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ji, L. C. Chen, J. Xu, J. Z.
Copyright Year	2003
Abstract	The paper presents detailed parametric simulations about the unsteady flow in the cascade passageways. The studies focus on two aspects of unsteady cascade flow. One is two dimensional (2D), which describes unsteady flow characteristics only in blade-to-blade surfaces. The other is three-dimensional (3D, a linear cascade), in which more attentions are paid to the stacking of the unsteady flow of 2D cascades along all spanwise positions. In the former aspect, two different types of unsteadiness are applied at the inlet. One is an azimuthal wave structure that processes through the cascade. The other unsteadiness is spatially uniform and oscillates in time. Using each type of unsteadiness, inflow oscillations of total pressure, total temperature and inflow angle are studied for one turbine and one compressor cascades. The emphasis is focused on the aerodynamic effects of the time-average value, the amplitude and the frequency of the unsteady flow. Results show that the unsteady cascade flow produces more losses than a steady one. Some potentials towards engineering applications are also described. Finally, unsteady flow in 3D linear cascade is studied. A design freedom that can not be used under steady flow frame, Edge-Matching, is put forward. It is essentially to match phase angle of unsteady flow along the whole span so that aerodynamic, aeroelastic, aeroacoustic and heat transfer performances of turbomachinery can be optimized and compromised. With a comprehensive viewpoint, case treatment, hot streak/blade interaction, clocking and even calming effects all belong to Edge-Matching technique. It may eventually promote the daily use of unsteady design.
Sponsorship	International Gas Turbine Institute
Starting Page	911
Ending Page	925
Page Count	15
File Format	PDF
ISBN	0791836894
DOI	10.1115/GT2003-38288
e-ISBN	0791836711
Volume Number	Volume 6: Turbo Expo 2003, Parts A and B
Conference Proceedings	ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
Language	English
Publisher Date	2003-06-16
Publisher Place	Atlanta, Georgia, USA
Access Restriction	Subscribed
Subject Keyword	Temperature Blades Cascades (fluid dynamics) Oscillations Turbomachinery Compressors Unsteady flow Flow (dynamics) Pressure Waves Engineering systems and industry applications Design Simulation Engineering simulation Inflow Heat transfer Turbines
Content Type	Text
Resource Type	Article

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