涡轮叶片内部冷却通道颗粒沉积的实验

The fine dust particles entering turbine blades are easy to deposit and weaken the heat transfer performance of the internal cooling channels. In order to explore the deposition characteristics of fine dust particles in the cooling channel inside the blade,the effects of fine dust particle diameter and Reynolds number of cooling air on the deposition of fine dust particles were experimentally studied. The experimental results showed that the deposition rate of the internal cooling channel increased firstly and then decreased with the Reynolds number of the cooling air. When the Reynolds number was up to 23 810, the deposition rate reached the peak. However,when the Reynolds number of the cooling air continued to increase,the deposition rate showed an obvious downward trend. When the diameter of fine dust particle increased,the deposition rate in the blade channel increased. The deposition rate at the front cavity of the blade was higher than that at the middle chord cavity and the back cavity,and the collection rate at the trailing edge was higher than that at the exit of the back cavity and the dust removal hole. In the blade channel,the amount of particles deposited on the leeward side of the ribs was greater than that on the windward side,and the amount of particles deposited at the corner of the front cavity was greater than that at the corner of the middle chord cavity.