基于通流程序的低速模拟气动设计及数值验证

为了验证多级轴流压气机出口级性能,开展四级重复级低速模拟气动设计,并坚持以二维设计为主,三维数值验证为辅。利用相同的设计系统,建立了高低速压气机之间相似的二维流场和叶表无量速度分布。随后,低速与高速压气机三维数值计算结果对比表明,压升系数特性吻合,流场相似,且叶表无量纲速度由设计点到失速点保持一致的变化趋势,进一步验证了二维设计的可行性;利用相同的系统设计高、低速压气机,有利于形成高速-低速-高速的良性循环,有利于完善基于通流程序的设计体系,积累设计经验。

Aerodynamic Design and Numerical Verification of Low-Speed Simulation Based on Throughflow Program

The research progress of fuel atomization in aeroengine is reviewed from three aspects which are experiments, theory and numerical simulation. Experimentally, the effects of injection parameters and environmental conditions on atomization can be qualitatively analyzed through atomization experiments, and measurement technology is the key factor to affect the accuracy of experiment. There are still some errors between the predicted value of atomization theory on liquid film shape and breaking characteristics and the experiment, and the atomization theory under complex aerodynamic conditions is relatively lacking. Some typical processes of fuel atomization can be obtained by numerical simulation, however, it is difficult to carry out the simulation of complicated, multi-process and multi-factor cases. Generally speaking, the atomization mechanism of aeroengine fuel has not been fully revealed.