• Title/Summary/Keyword: 터빈 익열

Search Result 3, Processing Time 0.026 seconds

Endwall Heat (Mass) Transfer Characteristics of a Linear Turbine Cascade at Off-Design Conditions (탈설계점에서의 선형 터빈 익열 끝벽 열(물질)전달 특성)

  • Lee, Sang-Woo;Park, Jin-Jae
    • Proceedings of the KSME Conference
    • /
    • 2004.11a
    • /
    • pp.1092-1097
    • /
    • 2004
  • The heat (mass) transfer characteristics on the endwall surface of a first-stage linear turbine rotor cascade at off-design conditions has been investigated by employing the naphthalene sublimation technique. The experiments are carried out at the Reynolds number of $2.78{\times}10^{5}$ for two incidence angles of -5% and +5%. The positive incidence angle results in intensification of the pressure-side leg of a leading-edge horseshoe vortex, which delivers higher heat transfer along its trace. On the other hand, the negative incidence angle show an opposite tendency.

  • PDF

Endwall Heat (Mass) Transfer in a Turbine Cascade Under Combustor-Level High Free-Stream Turbulence (연소기 출구 난류 상태에서의 터빈 익열 끝벽 열(물질)전달 특성)

  • Jun, Sang-Bae;Lee, Sang-Woo;Park, Byung-Kyu
    • Proceedings of the KSME Conference
    • /
    • 2001.06d
    • /
    • pp.759-764
    • /
    • 2001
  • Heat (mass) transfer characteristics have been investigated on the endwall of a large-scale linear turbine cascade passage under a combustor-level high free-stream turbulence with a large length scale. Local heat (mass) transfer coefficients are measured by using the naphthalene sublimation technique. The result shows that local heat (mass) transfer on the endwall is greatly enhanced in the central region of the turbine passage, but there is no noticeable change in the local heat (mass) transfer in the region suffering severe heat load. Under the high free-stream turbulence, the local heat (mass) transfer coefficient shows more uniform distribution and its average value across the whole endwall region is increased by 26% of that at low turbulence condition. The heat (mass) transfer data on the endwall strongly supports that well-organized vortices near the endwall tends to suffer an suppression by the high free-stream turbulence.

  • PDF

Measurement of Heat (Mass) Transfer Coefficient on the Blade Surfaces of a Linear Turbine Rotor Cascade With a Four-Axis Naphthalene Profile Measuring System (4-축 나프탈렌 승화깊이 측정시스템을 이용한 터빈 블레이드 표면에서의 열(물질)전달계수 측정)

  • Kwon, Hyun-Goo;Lee, Sang-Woo;Park, Byung-Kyu
    • Proceedings of the KSME Conference
    • /
    • 2001.11b
    • /
    • pp.42-47
    • /
    • 2001
  • The heat (mass) transfer characteristics on the blade surface of a first-stage turbine rotor cascade for power generation has been investigated by employing the naphthalene sublimation technique. A four-axis profile measurement system is successfully developed for the measurements of the local heat (mass) transfer coefficient on the curved blade surface. The experiment is carried out at the free-stream Reynolds number and turbulence intensity of $2.09\times10^5$ and 1.2%. The results on the blade surfaces show that the local heat (mass) transfer on the suction surface is strongly influenced by the endwall vortices, but that on the pressure surface shows a nearly two-dimensional nature. The pressure surface has a more uniform distribution of heat load than the suction one.

  • PDF