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研究了采用“相位延迟”边界条件的谐波平衡法用于周向进气畸变计算的可行性及其计算效率,考虑了进气总压畸变形式为正弦波和方波的两种情况。对于正弦波形式的进气总压畸变采用较少阶数的谐波计算就可得到和双时间推进法相近的计算结果,计算速度最大可以提高48倍。对于方波形式的进气畸变,则需要采用更多阶数的谐波计算才能还原得到较准确的非定常流场,计算速度提高了7倍。算例表明,谐波平衡法可以有效的应用于跨声风扇周向进气畸变的非定常计算中,同时大幅提高计算速度。
The feasibility and computational efficiency of harmonic balance method with “phase delay” boundary condition for the calculation of circumferential inlet air distortion are studied. Two cases of total pressure distortion of inlet are considered as sine wave and square wave. For the sine wave form of the total inlet pressure distortion using less order harmonic calculation can be obtained and the dual time propulsion method similar results, the maximum computational speed can be increased 48 times. For the square wave inflow distortion, we need to use more order harmonic calculation can be reduced to get a more accurate unsteady flow field, computational speed increased by 7 times. The example shows that the harmonic balance method can be effectively applied to the unsteady calculation of cross-wind fan circumferential inlet air distortion, and at the same time, the computational speed is greatly increased.