【作者】 马昌友；

【导师】 刘波；

【作者基本信息】 西北工业大学 ， 流体机械及工程， 2007， 硕士

【摘要】 压气机是利用叶片进行机械能量与流体能量相互转换的一种旋转机械，广泛应用于能源动力、航空等与国民经济及国防安全紧密相关的领域。深入研究压气机转子叶尖间隙流场非定常压力脉动，掌握非定常流场结构和能量损失机理，对进一步提高压气机效率是非常重要的。 本文对一单级轴流压气机的转子叶尖间隙流场的动态压力进行了测量与研究。在靠近转子叶片处机匣端壁上放置Kulite高频动态压力传感器，通过调节压气机不同的工作状态，测量叶尖前后端壁流场动态压力脉动，利用快速傅里叶变换，把压力信号从时域转换到频域，从频谱的角度揭示轴流压气机转子叶尖间隙的非定常压力脉动特征，以及其随着压气机转子转速、出口背压、静叶周向位置等工况变化规律，同时分析压气机的气动性能与气流稳定性的关联。 为了提高流场动态压力的测量准确度，文中对组成动态压力测量系统的动态压力传感器、采集系统、测量分析软件等的选取和安装进行了详细的介绍。另外，为了降低干扰源对测量系统的影响，采取了干扰源屏蔽措施。 试验结果显示了转子叶尖前后非定常流场压力脉动频谱中主要含有一阶谱以及二阶谱、三阶谱等高阶谱。一阶谱频率即基频只与转子转速和转子叶片数相关，与出口背压等压气机其它工况无关，随着转速升高，基频相应增大。文中主要分析了转子转速、出口背压以及静叶周向位置对一到四阶谱峰值的影响。 随着转子转速的提高，各阶谱峰值呈现上升趋势，但对叶尖前后流场影响程度不同，对叶尖中部处流场影响最大，其次是叶尖前、后缘处流场。出口背压提高，叶尖中部处各阶谱峰值呈现明显下降趋势，叶尖前缘处一阶谱峰值也有略微下降趋势，但叶尖尾缘处一阶谱峰值有略微上升趋势，高阶谱峰值变化不明显。静叶周向位置对上游流场压力脉动各阶谱峰值也有略微的影响。 本文的研究结果对研究其它旋转机械流场压力脉动也有参考价值。更多还原

【Abstract】 Compressor is one of the rotating machinery which used to convert mechanical energy to fluid energy and widely used in dynamic energy, aviation and other fields closely related to the national economy and security. Thoroughly researches to unsteady pressure pulse in tip clearance flow of rotor and its changes are extremely significant to further improving the efficiency of the compressor.The pressure fluctuation of the tip clearance flow of the rotor in a single-stage axial compressor have been measured and analyzed in this paper. The dynamic pressure sensors have been installed on the casing near the tip clearance of the rotor and a high speed dynamic pressure measurement system had been furnished. The time-domain wave of unsteady pressure fluctuation acquired at different work status of the compressor were transformed into frequency spectral curves by Fast Fourier Transform (FFT) in this paper to investigate the relation of rotor speed ,outlet pressure and circumferential position of stator to the frequency spectrum performance, and associated with aerodynamic performance and flow stability of compressor .In order to improve the measurement accuracy, the dynamic pressure measurement system which is composed of the dynamic pressure sensor, acquisition System, measurement and analysis software is detailed in this paper. In addition, in order to reduce the impact of interference sources to the measurement system, interference shielding measures are introduced.The results showed that pressure fluctuation spectrum in unsteady flow field between the leading edge and trailing edge of tip blade contain the firist order spectrum, second order spectrum, third order spectrum etc. Dominant frequency increases with the increase of the rotor speed, but less reaction to the outlet pressure and other work status. Then the impact of rotor speed, outlet pressure and circumferential position of stator to the first, second, third and forth order peak value are mainly analyzed in the paper.With the rotor speed increases, the first and high order peak value showed a increase trend. But have different degree at different flow field. Compared with the leading edges and trailing edge of blade, the peak value achieves maximum at the center更多还原