Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

EFFECT OF A ROTOR WAKE ON THE LOCAL HEAT TRANSFER ON THE FORWARD HALF OF A CIRCULAR CYLINDER

Get access (open in a dialog) DOI: 10.1615/IHTC8.2160
pages 1249-1255

Abstrakt

An experiment has been developed to simulate the wake dynamics of a turbine rotor-stator combination by means of a spoked wheel rotating in annular flow. The wakes impinged on a simulated stator, composed of a circular cylinder with a splitter plate behind it. The focus of the research was spanwise averaged circumferentially local heat transfer in the circular cylindrical leading edge region of a turbine airfoil. Over a wide range of flow Reynolds numbers and blade-passing frequencies, the wakes produced only a modest increase in heat transfer over the baseline no-rotor data. The data in the presence of the rotor wakes showed an asymmetry from the leeward to the windward side. Windward-side levels of from 30 to 40 percent higher than corresponding leeward-side levels were not uncommon, particularly at the combination of high blade-passing frequency and larger wake-generating pins. The stagnation gauge data were examined against the Tu√Re parameter over a wide range from 8 to 40, and found not to be fully correlated by this often-used parameter. There were distinct trends with both free-stream turbulence level and wake-generating bar diameter. The results strongly indicate a need to separate the wake influence from turbulence effects.