| Labyrinth seal is a non-contact dynamic seal with long service life,simple structure,no friction,stable and reliable performance,etc.It has been widely used in mechanical seal structures such as aerospace engines and blowers.The labyrinth seal is not limited by speed and temperature,and has low frictional power consumption.Labyrinth seal structure instead of traditional piston ring is mostly used in reciprocating compressor,can reduce power consumption,to resolve the conflict between the compression piston and the conditions required stability of the cavity medium.However,due to certain defects in the sealing system itself,such as losses caused by gas leakage,it is an important factor that directly affects the long-term use of the labyrinth compressor.In-depth study of the sealing mechanism in the labyrinth seal system and the law the present paper of energy consumption in the internal flow field is of great significance to reducing the leakage of the seal structure and forming the application theory of the axial labyrinth seal.The present paper takes the axial labyrinth seal structure of the piston and cylinder of a certain type of labyrinth compressor as the research object.A three-dimensional model is established for the axial labyrinth seal structure,and the leakage characteristics of the labyrinth seal are numerically simulated and analyzed.Using the CFD software FLUENT as the main calculation tool,the axial labyrinth seal between piston and cylinder was simulated by the two-way fluid solid coupling analysis method.Analyze the turbulent flow speed and pressure inside the labyrinth seal system,and study the distribution characteristics of the flow inside the labyrinth seal.Due to manufacturing and assembly errors and the non-contact feature of the labyrinth seal,the eccentricity between the cylinder and the piston of the labyrinth seal is unavoidable,which will inevitably affect the sealing performance.In order to control the reasonable amount of eccentricity and study the influence of eccentricity on the sealing performance,the present paper conducts numerical simulation analysis on the labyrinth sealing system with different eccentric distances(0.05 mm,0.10 mm,0.15 mm,0.20mm),and analyzes the effect of the eccentricity on the sealing cavity.Based on the influence of the internal flow field distribution,the pressure change,pressure distribution,turbulent kinetic energy distribution and other changes in the cavity at all levels are obtained,and the degree of influence of different eccentricities on the leakage characteristics of the labyrinth seal is obtained.According to the characteristics of the axial labyrinth seal structure of the piston and cylinder of the labyrinth compressor,an experimental plan was developed to test the vibration,pressure difference and leakage of the labyrinth compressor with different eccentricity.The load experiment is carried out under the condition of no eccentricity,and the sealing characteristics and dynamic characteristics of the ideal labyrinth seal gap under 0.3mm are obtained.According to the simulation analysis,select the labyrinth compressors with eccentricity of 0.05 mm,0.10 mm,0.15 mm,0.20 mm,and perform vibration tests in the X,Y,and Z directions respectively,and record the corresponding inlet and outlet pressure values,and obtain different eccentricities Corresponding labyrinth seal leakage.Considering the processing cost and assembly difficulty,combined with the experimental results and leakage analysis results,a reasonable allowable range of eccentricity is determined.Perform simulation analysis and experimental testing on the axial labyrinth seal in the labyrinth compressor,in order to verify the feasibility of the numerical simulation analysis method of the axial labyrinth seal,the axial labyrinth seal method is formed and put into practical application.. |
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