叶型尺寸比例变化对预测涡轮气动性能和气动力的影响（英文）

Effects of airfoil scaling on the predicted aerodynamic performance and forcing of turbine

以某火箭发动机涡轮为对象,研究了动静叶叶型尺寸比例变化技术对预测涡轮气动性能和非定常气动力的影响。该涡轮为一级轴流涡轮,含18个静叶和32个动叶。针对不同比例系数变化的结构进行了三维定常和非定常数值模拟,以原始结构作为基准算例进行对比分析。结果表明,动静叶比例变化对定常和非定常时均叶片压力和性能预测影响很小,尺寸变化超过10%时,预测偏差不到2%。对时域上的非定常压力和气动力进行快速傅立叶变换(FFT)得到频域特性。分析表明,比例变化对频率特性的预测几乎没有影响,而对幅值特性影响很大,预测的幅值偏差与变化比例大小没有直接关系,但是尺寸变化较小的情况确实显示出相对稳定且较小的预测偏差。

Effects of vane/blade airfoil scaling on the prediction of aerodynamic performance and unsteady forcing have been investigated for the turbine.A single-stage axial-flow turbine with 18 vanes and 32 blades was adopted.3D steady and unsteady simulations were conducted for configurations with different scaling factors,and the full-scale case was used as the baseline simulation.The results show that the vane/blade airfoil scaling has little influence on the steady and time-averaged pressure on the blade and performance of turbine.The predicted deviation is below 2%even if the scaling deviation exceeds 10%.The fast Fourier transform(FFT)is used to transform the unsteady pressure and forcing predicted in the time domain to obtain the characteristics in the frequency domain.The vane/blade airfoil scaling has little difference on the frequency characteristics of unsteady pressure and aerodynamic forces,while amplitude is greatly affected.The results show that the predicted amplitude deviation is not directly related to the scaling deviation,but the case with small scaling deviation(3.125%in this study)indeed shows relatively stable and minor error.