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采用液晶显示技术,对两种实际叶型的前缘凹面的模拟表面在大冲距范围内进行了射流冲击热实验,并与半圆凹面的换热进行了比较.研究结果表明,在小冲击距时,随着冲击面曲率的增大,滞止区内的换热较之半圆面有所增强;在实验参数范围内,两实际叶型表面的Nus比半圆面约高12%;对于相对喷嘴间距为227的情况,所研究的3种曲面的Nus随相对冲距的变化存在一个极值点;对于相对喷嘴间距为135的情况,未发现有极值点.此外,还给出了换热准则关系式
Using liquid crystal display (LCD) technology, the jet impact heat experiments were conducted on the simulated surfaces of the front concave surfaces of the two kinds of actual blades in the range of large punching distance and compared with the heat transfer of the semicircular concave surface. The results show that, , The heat transfer in the stagnation zone is enhanced as the curvature of the impact surface increases. In the experimental parameters, the Nus of the two actual blade surfaces is about 12% higher than that of the semicircular surface. For the relative nozzle There is an extreme point of Nus with respect to the change of relative heading distance for the three kinds of curved surfaces studied and no extreme point is found for the case where the relative nozzle pitch is 135. In addition, The standard relation