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为了更加准确获得颗粒物在涡轮中的沉积分布,以某涡轮叶片为模型,选用最接近航空发动机内部颗粒组成的Jim Bridger Power Station(JBPS)颗粒为污染物,同时,利用C++编写合适的User Defined Function(UDF)经过调试来分析颗粒沉积后叶片边界的复杂变形和边界网格依赖于时间变化的重构生成,在考虑每个时间步长颗粒沉积在叶片上从而改变叶片几何特性和换热特性的情况下,来深入研究颗粒物沉积在叶片的整个过程,最终得出了沉积的分布情况,并且通过数值研究结果与实验结果的对比,验证了网格重构与融合程序的合理性、准确性。根据叶片变形情况预测腐蚀的发生情况。随后,改变主流温度、颗粒直径来研究颗粒沉积特性。结果表明:颗粒主要沉积在叶片压力面中部,但会使得叶片前缘和压力面中部均产生明显变形;叶片前缘由于颗粒沉积使得粗糙度增加形成锯齿形,最先遭受腐蚀;颗粒直径影响颗粒沉积的分布与沉积生长速度;只影响沉积速度,并不改变沉积分布。
In order to get more accurate depositional distribution of particles in the turbine, taking a turbine blade as a model, selecting the particles of Jim Bridger Power Station (JBPS) which are closest to the internal particle of the aeroengine as the pollutants, and writing suitable User Defined Function (UDF) was commissioned to analyze the complex deformation of the blade boundaries after grain deposition and the time-dependent reconstruction of the boundary meshes, taking into account that the deposition of particles on the blade at each time step changes the geometric and heat transfer characteristics of the blade In the end, the distribution of sediment is obtained, and the comparison between the numerical results and experimental results verifies the rationality and accuracy of the grid reconstruction and fusion procedures. According to the deformation of the blade to predict the occurrence of corrosion. Subsequently, changing the mainstream temperature, particle diameter to study the particle deposition characteristics. The results show that the particles are mainly deposited in the middle part of the pressure surface of the blade, but the deformation of the leading edge of the blade and the middle part of the pressure surface will be obvious. The leading edge of the blade will increase in roughness and form serration, Sedimentary distribution and deposition growth rate; only affect the deposition rate, does not change the sedimentary distribution.