NDLI: Approximate Solutions for Flow and Heat Transfer in Pre-Swirl Rotating-Disc Systems

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Karabay, Hasan Wilson, Michael Owen, J. Michael
Copyright Year	2001
Abstract	The paper presents approximate solutions of the momentum-integral equations for swirling flow in a rotating cavity, which is used to model a cover-plate pre-swirl rotating-disc system in a gas-turbine engine. The solutions give the variation of Cm, the moment coefficient on the rotating discs, with βp, the pre-swirl ratio of the cooling air. Cm decreases from the free-disc value at βp = 0 to zero at βp = βp,crit, and becomes negative when βp > βp,crit. Using the Reynolds analogy, the theoretical distribution of Cm is used to calculate Nuav, the average Nusselt number on the heated disc. This shows that Nuav has a minimum value when βp = βp,crit. The approximate solutions of Cm and Nuav are compared with computed values obtained using an axisymmetric elliptic solver. For most of the conditions considered, the theoretical values of Cm are in good agreement with the computed values. However, unlike the approximate solutions, the computed values of Cm show some dependency on the coolant flow rate. There is reasonable agreement between the theoretical and computed distribution of Nuav provided βp < βp,crit. Near βp,crit there are discontinuities in the computed values, and for larger values of βp, where the Reynolds analogy may be invalid, the theoretical and computed variations of Nuav tend to diverge.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791878521
DOI	10.1115/2001-GT-0200
Volume Number	Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration
Conference Proceedings	ASME Turbo Expo 2001: Power for Land, Sea, and Air
Language	English
Publisher Date	2001-06-04
Publisher Place	New Orleans, Louisiana, USA
Access Restriction	Subscribed
Subject Keyword	Cavities Cooling Gas turbines Rotating disks Swirling flow Disks Coolants Momentum Flow (dynamics) Heat transfer Engines
Content Type	Text
Resource Type	Article

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