Su, Guoguang (2005-12). Numerical simulation of flow and heat transfer of internal cooling passage in gas turbine blade. Doctoral Dissertation. Thesis uri icon

abstract

  • A computational study of three-dimensional turbulent flow and heat transfer was performed in four types of rotating channels. The first type is a rotating rectangular channel with V-shaped ribs. The channel aspect ratio (AR) is 4:1, the rib height-to-hydraulic diameter ratio (e/Dh) is 0.078 and the rib pitch-to-height ratio (P/e) is 10. The rotation number and inlet coolant-to-wall density ratio were varied from 0.0 to 0.28 and from 0.122 to 0.40, respectively, while the Reynolds number was varied from 10,000 to 500,000. Three channel orientations (90 degrees, -135 degrees, and 135 degrees from the rotation direction) were also investigated. The second type is a rotating rectangular channel with staggered arrays of pinfins. The channel aspect ratio (AR) is 4:1, the pin length-to-diameter ratio is 2.0, and the pin spacing-to-diameter ratio is 2.0 in both the stream-wise and span-wise directions. The rotation number and inlet coolant-to-wall density ratio varied from 0.0 to 0.28 and from 0.122 to 0.20, respectively, while the Reynolds number varied from 10,000 to 100,000. For the rotating cases, the rectangular channel was oriented at 150 degrees with respect to the plane of rotation. In the rotating two-pass rectangular channel with 45-degree rib turbulators, three channels with different aspect ratios (AR=1:1; AR=1:2; AR=1:4) were investigated. Detailed predictions of mean velocity, mean temperature, and Nusselt number for two Reynolds numbers (Re=10,000 and Re=100,000) were carried out. The rib height is fixed as constant and the rib-pitch-to-height ratio (P/e) is 10, but the rib height-to-hydraulic diameter ratios (e/Dh) are 0.125, 0.094, and 0.078, for AR=1:1, AR=1:2, and AR=1:4 channels, respectively. The channel orientations are set as 90 degrees, the rotation number and inlet coolant-to-wall density ratio varied from 0.0 to 0.28 and from 0.13 to 0.40, respectively. The last type is the rotating two-pass smooth channel with three aspect ratios (AR=1:1; AR=1:2; AR=1:4). Detailed predictions of mean velocity, mean temperature and Nusselt number for two Reynolds numbers (Re=10,000 and Re=100,000) were carried out. The rotation number and inlet coolant-to-wall density ratio varied from 0.0 to 0.28 and from 0.13 to 0.40, respectively. A multi-block Reynolds-averaged Navier-Stokes (RANS) method was employed in conjunction with a near-wall second-moment turbulence closure.
  • A computational study of three-dimensional turbulent flow and heat transfer was
    performed in four types of rotating channels.
    The first type is a rotating rectangular channel with V-shaped ribs. The channel
    aspect ratio (AR) is 4:1, the rib height-to-hydraulic diameter ratio (e/Dh) is 0.078 and the
    rib pitch-to-height ratio (P/e) is 10. The rotation number and inlet coolant-to-wall
    density ratio were varied from 0.0 to 0.28 and from 0.122 to 0.40, respectively, while the
    Reynolds number was varied from 10,000 to 500,000. Three channel orientations (90
    degrees, -135 degrees, and 135 degrees from the rotation direction) were also
    investigated.
    The second type is a rotating rectangular channel with staggered arrays of pinfins.
    The channel aspect ratio (AR) is 4:1, the pin length-to-diameter ratio is 2.0, and the
    pin spacing-to-diameter ratio is 2.0 in both the stream-wise and span-wise directions.
    The rotation number and inlet coolant-to-wall density ratio varied from 0.0 to 0.28 and
    from 0.122 to 0.20, respectively, while the Reynolds number varied from 10,000 to 100,000. For the rotating cases, the rectangular channel was oriented at 150 degrees with
    respect to the plane of rotation.
    In the rotating two-pass rectangular channel with 45-degree rib turbulators,
    three channels with different aspect ratios (AR=1:1; AR=1:2; AR=1:4) were
    investigated. Detailed predictions of mean velocity, mean temperature, and Nusselt
    number for two Reynolds numbers (Re=10,000 and Re=100,000) were carried out. The
    rib height is fixed as constant and the rib-pitch-to-height ratio (P/e) is 10, but the rib
    height-to-hydraulic diameter ratios (e/Dh) are 0.125, 0.094, and 0.078, for AR=1:1,
    AR=1:2, and AR=1:4 channels, respectively. The channel orientations are set as 90
    degrees, the rotation number and inlet coolant-to-wall density ratio varied from 0.0 to
    0.28 and from 0.13 to 0.40, respectively.
    The last type is the rotating two-pass smooth channel with three aspect ratios
    (AR=1:1; AR=1:2; AR=1:4). Detailed predictions of mean velocity, mean temperature
    and Nusselt number for two Reynolds numbers (Re=10,000 and Re=100,000) were
    carried out. The rotation number and inlet coolant-to-wall density ratio varied from 0.0
    to 0.28 and from 0.13 to 0.40, respectively.
    A multi-block Reynolds-averaged Navier-Stokes (RANS) method was employed
    in conjunction with a near-wall second-moment turbulence closure.

publication date

  • December 2005