Abstract
Established was a model for analyzing the fluid/heat coupling in the cooling blades of a return flow type turbine. The P-1 radiation model was used to add the radiant heat flow to the equation as the source item. An analysis was performed of the fluid/heat coupling of the cooling blades having no heat barrier coating with radiations being taken into account and not respectively. It has been found that the cooling air, which accounts for 3.76% of the total gas mass flow rate, can cause a temperature drop of 200 K to the blades by using the return flow type cooling structures. When the highest inlet temperature is 1655 and 1555 K respectively, a comparison of the temperature distributions on the blades obtained by using the two calculation models shows that the influence of radiations on the temperature of the blade surfaces is remarkable and this makes it relatively easy to form a highest temperature point at the tip of the trailing edge of return flow type cooling blades.
Original language | English |
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Pages (from-to) | 271-274 |
Number of pages | 4 |
Journal | Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power |
Volume | 26 |
Issue number | 3 |
State | Published - May 2011 |
Keywords
- Cooling blade
- Fluid/heat coupling
- Gas turbine
- Radiation
- Return flow type cooling structure