周期的後流の影響を受けるタービン動翼前縁まわりの熱伝達に関する研究 : 第2報,主流乱れが共存する場合

概要

論文の詳細を見る
Detailed measurements are performed for time-averaged heat-transfer distributions around the leading edge of a blunt body that is subjected to periodically incoming wakes under the influence of mainstream turbulence. The blunt body is a test model of a front portion of a turbine blade in gas turbines and consists of a semicircular cylindrical leading edge and a flat-plate afterbody. Measurements for a wide range of steady and unsteady flow conditions, i.e., Reynolds number, wake-generating bar passing frequency and main stream turbulence intensity, are conducted. The wake-affected heat-transfer distributions indicate that the wake passage over the leading edge causes a significant increase in heat transfer there, but such a wake effect becomes less prominent for the case of higher mainstream turbulence. Maxmum heat trasnfer at the reattachment point decreases due to the wake passage. After the reattachment point, the heat-transfer distribution tends to follow the correlation for a turbulent boundary layer as the maintream turbulence increases. A comparison is made between the measured heat transfer, in particular the heat-transfer enhancement around the leading edge, and the calculations using a simple prediction method developed, which verifies the usefulness of the prediction method despite its simplicity.
一般社団法人日本機械学会の論文
1995-01-25