NDLI: Effects of nozzle-strut integrated design concepton on the subsonic turbine stage flowfield

Content Provider	Springer Nature Link
Author	Liu, Jun Du, Qiang Liu, Guang Wang, Pei Zhu, Junqiang
Copyright Year	2014
Abstract	In order to shorten aero-engine axial length, substituting the traditional long chord thick strut design accompanied with the traditional low pressure(LP) stage nozzle, LP turbine is integrated with intermediate turbine duct (ITD). In the current paper, five vanes of the first stage LP turbine nozzle is replaced with loaded struts for supporting the engine shaft, and providing oil pipes circumferentially which fulfilled the areo-engine structure requirement. However, their bulky geometric size represents a more effective obstacle to flow from high pressure (HP) turbine rotor. These five struts give obvious influence for not only the LP turbine nozzle but also the flowfield within the ITD, and hence cause higher loss.Numerical investigation has been undertaken to observe the influence of the Nozzle-Strut integrated design concept on the flowfield within the ITD and the nearby nozzle blades. According to the computational results, three main conclusions are finally obtained. Firstly, a noticeable low speed area is formed near the strut’s leading edge, which is no doubt caused by the potential flow effects. Secondly, more severe radial migration of boundary layer flow adjacent to the strut’s pressure side have been found near the nozzle’s trailing edge. Such boundary layer migration is obvious, especially close to the shroud domain. Meanwhile, radial pressure gradient aggravates this phenomenon. Thirdly, velocity distribution along the strut’s pressure side on nozzle’s suction surface differs, which means loading variation of the nozzle. And it will no doubt cause nonuniform flowfield faced by the downstream rotor blade.
Starting Page	494
Ending Page	504
Page Count	11
File Format	PDF
ISSN	10032169
Journal	Journal of Thermal Science
Volume Number	23
Issue Number	5
e-ISSN	1993033X
Language	English
Publisher	Science Press
Publisher Date	2014-09-03
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Intermediate Turbine Duct Integrated Design Concept Flowfield Analysis Total Pressure Loss Analysis Classical Continuum Physics Engineering Fluid Dynamics Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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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
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