REDUCTION OF UNSTEADY STATOR–ROTOR INTERACTION USING TRAILING EDGE BLOWING
REDUCTION OF UNSTEADY STATOR–ROTOR INTERACTION USING TRAILING EDGE BLOWING
复制标题
使用后缘吹气减少不稳定的定子-转子相互作用
DOI：
10.1006/jsvi.2000.2922
复制
发表时间：
2000
影响因子：
4.7
通讯作者：
W. Ng
中科院分区：
文献类型：
--
作者：
T. A. Leitch;C. A. Saunders;W. Ng
摘要对航空发动机模拟器上游定子尾缘附加质量流的影响进行了气动声学研究。通过采用尾缘吹气来减少定子的尾迹，使进入转子的流动更加均匀，从而减少了非定常的定子-转子干扰。在这些实验中，在1/14比例的模型进气中使用了减少的定子(4个)，该进气与4·1英寸(10·4厘米)的涡扇发动机模拟器耦合。为了评估在30K、50K和70kr.pm三种速度下的气动声学性能，进行了气动流场和声学远场的稳态测量。最低测试速度(30k r.pm)在叶片通过音中显示了高达8.9db的降噪效果。在50K和70kr.pm时，叶片通过音分别减少了5.5和2.6dB。此外，在每种情况下，后缘吹气都降低了总体声压级。气动测量结果表明，后缘吹气使风机端面变形明显减小。四个上游定子的后缘吹风并未改变风机的运行点，吹风所增加的质量流量小于风机质量流量的1%。这些实验结果清楚地表明，从定子后缘吹气可以有效地降低非定常定子-转子干扰和随后的前向辐射噪声。
Abstract An aeroacoustic investigation was performed to assess the effects of adding mass flow at the trailing edges of stators upstream of an aircraft engine simulator. By using trailing edge blowing to minimize the shed wakes of the stators, the flow into the rotor was made more uniform, hence reducing the unsteady stator–rotor interaction. In these experiments, a reduced number of stators (four) was used in a 1/14 scale model inlet which was coupled to a 4·1in (10·4 cm) turbofan engine simulator. Steady state measurements of the aerodynamic flow field and acoustic far field were made in order to evaluate the aeroacoustic performance at three simulator speeds: 30k, 50k, and 70kr.p.m. The lowest test speed (30k r.p.m.) showed a noise reduction as large as 8·9dB in the blade passing tone. At 50k and 70kr.p.m., the reduction in blade passing tone was 5·5 and 2·6dB respectively. In addition, trailing edge blowing reduced the overall sound pressure level in every case. Aerodynamic measurements showed that fan face distortion was significantly reduced due to trailing edge blowing. The addition of trailing edge blowing from the four upstream stators did not change the operating point of the fan, and the mass flow added by the blowing was less than 1% of the fan mass flow rate. The results of these experiments clearly demonstrate that blowing from the trailing edges of the stators is effective in reducing unsteady stator–rotor interaction and the subsequent forward radiated noise.