Abstract
Numerical simulations for a single channel and muti-turn connected cooling channel model with 90° ribs is conducted to understand the effect of multi-turn connection on heat transfer and pressure coefficient of internal channel in rotor blade. The heat transfer of turned channel is measured by utilizing transient liquid crystal measurement, and the influence mechanism of multi-turn connection in tuning channel is revealed. Experimental results show that the velocity distribution is uneven in each passage due to tuning eddy. Both the pressure coefficient and the Nusset number (Nu) decrease along the flow direction. The Nu distribution is asymmetric in each passage due to turn-connection. The distribution of averaged Nu numbers has a multiple-peak form as a result of secondary flow induced by rib turbulations. The area of high Nu between two continuous ribs is gradually shifted to the rib downstream. The average Nu in each passage gradually increases while the ratio is slowly reduced as the Reynolds number increases.
| Original language | English |
|---|---|
| Pages (from-to) | 131-136 |
| Number of pages | 6 |
| Journal | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University |
| Volume | 48 |
| Issue number | 10 |
| DOIs | |
| State | Published - 10 Oct 2014 |
Keywords
- Heat transfer
- Numerical simulation
- Passage connection
- Pressure coefficient
- Transient liquid crystal
- Turbine blade