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随着旋转机械工作介质向高参数方向发展,密封气流激振力成为影响旋转机械转子稳定性的重要因素之一。介质参数提高后,由密封流体动压产生的气体轴承效应增强,密封气流激振力增大。借鉴错位轴承理论,提出一种负错位密封结构,可降低流体动压效应,抑制密封气流激振力。应用CFD技术建立负错位密封与传统圆形密封流场特性求解模型,分析比较2种密封形式周向压力分布特性的差异,研究错位率、转速、偏心、压比等因素对2种密封形式气流力的影响规律。研究结果表明,负错位密封与传统圆形密封泄漏特性相当;与传统圆形密封相比,负错位密封周向压力差小,气流激振力小,负错位密封稳定性好。
As the working medium of rotating machinery develops in the direction of high parameters, the exciting force of the seal air flow becomes one of the important factors that affect the stability of rotating machinery rotor. After the media parameters are increased, the gas bearing effect produced by the hydrodynamic pressure of the sealed fluid is enhanced, and the exciting force of the sealed airflow is increased. Referring to the theory of dislocation bearing, a negative dislocation seal structure is proposed, which can reduce the hydrodynamic pressure effect and suppress the excitation force of seal air flow. The CFD technique is used to establish the model for solving the flow field characteristics of the negative seal and the traditional circular seal. The differences of the circumferential pressure distribution characteristics of the two kinds of seal forms are analyzed and compared. The influences of the displacement rate, rotational speed, eccentricity, The law of influence. The results show that the negative misorientation seal is equivalent to that of the traditional circular seal. Compared with the traditional circular seal, the negative misorientation seal has small circumferential pressure difference, small airflow excitation force, and good negative seal stability.