Tip leakage flow and heat transfer characteristics on rotor casing and blade tip in an axial gas turbine engine: Steady analysis

Hamidur Rahman, Sung In Kim, Ibrahim Hassan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Steady simulations have been performed to investigate tip leakage flow and heat transfer characteristics on the casing and rotor blade tip in a single stage turbine engine. A turbine stage of stator and rotor was modeled with a pressure ratio of 3.2. The predicted isentropic Mach number and adiabatic wall temperature on the casing showed good agreement with available experimental data. The effects of tip clearance height and rotor rotational speed on the blade tip and casing heat transfer characteristics are mainly considered. It is observed that the tip leakage flow structure is highly dependent on the height of the tip gap as well as speeds of the rotor blade. In all cases, flow separates just around the corner of the pressure side of the blade tip. The region of recirculating flow increases with the increase of the clearance height. Then the flow reattaches on the tip surface near the suction side beyond the flow separation. This flow reattachment enhances surface heat transfer. The leakage flow interaction with the reverse cross flow, induced by relative casing motion, is found to have significant effect on the blade tip and casing heat transfer distribution. Critical region of high heat transfer on the casing exists near the blade tip leading edge and along the pressure side edge at all clearance height. Whereas, at high speed rotation, it tends to move towards the trailing edge due to the change of inflow angle.

Original languageEnglish
Title of host publication2008 Proceedings of the ASME Summer Heat Transfer Conference, HT 2008
Pages635-644
Number of pages10
Publication statusPublished - 21 Sep 2009
Externally publishedYes
Event2008 ASME Summer Heat Transfer Conference, HT 2008 - Jacksonville, FL, United States
Duration: 10 Aug 200814 Aug 2008

Publication series

Name2008 Proceedings of the ASME Summer Heat Transfer Conference, HT 2008
Volume2

Other

Other2008 ASME Summer Heat Transfer Conference, HT 2008
CountryUnited States
CityJacksonville, FL
Period10/8/0814/8/08

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

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  • Cite this

    Rahman, H., Kim, S. I., & Hassan, I. (2009). Tip leakage flow and heat transfer characteristics on rotor casing and blade tip in an axial gas turbine engine: Steady analysis. In 2008 Proceedings of the ASME Summer Heat Transfer Conference, HT 2008 (pp. 635-644). (2008 Proceedings of the ASME Summer Heat Transfer Conference, HT 2008; Vol. 2).