基于阻抗法的密封动力特性系数实验识别  

Experimental identification for rotordynamic coefficients of labyrinth seal based on impedance method

作　　者：张万福[1,2] 王应飞 张晓斌 杨兴辰[1] 李春 ZHANG Wanfu;WANG Yingfei;ZHANG Xiaobin;YANG Xingchen;LI Chun(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China;North China Electric Power Research Institute Co.,Ltd.,Beijing 100045,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海市动力工程多相流动与传热重点实验室,上海200093 [3]华北电力科学研究院有限责任公司,北京100045

出　　处：《航空学报》2022年第1期554-565,共12页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(51875361);上海市自然科学基金(20ZR1439200)。

摘　　要：搭建并优化了密封动力特性系数实验识别装置,应用阻抗法对梳齿密封动力特性系数开展实验识别,研究转速、进口压力和涡动频率对密封动力特性系数的影响。应用基于微元理论的密封动力特性系数识别方法对密封动力学特性进行了数值计算分析,与实验结果进行对比分析。结果表明:实验识别梳齿密封动力特性系数整体上略高于数值计算结果,但趋势上吻合良好,特别是表征系统稳定性的密封有效阻尼系数,数值与实验具有良好的一致性。梳齿密封动力特性系数在转子低频(<;100 Hz)涡动时存在一定的频率依赖性,高频(>100 Hz)时阻尼系数的频率依赖性较弱。实验和数值模拟均表明,相较于转速,压比的变化对密封有效阻尼系数的影响更大。An experimental facility is established and improved to identify rotordynamic coefficients of the labyrinth seal.The impedance method is employed to identify the rotordynamic coefficient of the labyrinth seal.Effects of rotational speed,inlet pressure and whirling frequency on the dynamic characteristics are studied.The identification method for the dynamic characteristics of the seal based on the infinitesimal theory is applied for numerical analysis of the experimental seal.Results of numerical analysis are compared with the experimental results.The comparison shows that the rotordynamic characteristics of the labyrinth seal identified from the experiment are slightly higher than those from numerical analysis,but their varying trends are in good agreements.Particularly,the results of the effective damping coefficient,which characterizes the stability of the system,has good consistency.The dynamic coefficient of the labyrinth seal shows a frequency dependence when the rotor whirls at low frequencies(<100 Hz),and the frequency dependence is weak at high frequencies(>100 Hz).Both experiments and numerical simulations show that compared with rotational speed,pressure ratio has a greater impact on the effective damping coefficient of the labyrinth seal.

关 键 词：透平机械 梳齿密封 动力特性系数 阻抗法 振动 

分 类 号：V232.9[航空宇航科学与技术—航空宇航推进理论与工程]