Based On The Fractal Theory Of Dry Gas Sealing Ring Friction And Wear Numerical Simulation

Is a new type of dry gas seal gas seal current ly appears, compared to the tradit iona l mecha nical sea l it has many advantages and is capable of carrying a number of specia l cond it ions of sealing, fr iction and wear characterist ics of dry gas seal fr ictio n inter face and its equip ment carrying capacit y, safety closely related, lo ngevit y and the amount of leakage and the like. Wit h the continuo us improvement of the leve l of production of the sealing performance of machinery and equip ment have become increasingly demand ing, study of dry gas seal faces more and more deeply, its application has been made in t he past of nor ma l temperature and pressure condit ions gradually e xpand to a high te mperature, high pressure specia l condit ions, te mperature, vacuum, etc. and even some extreme condit ions. To be able to make some important and specia l equip ment to achieve and ma inta in a long stable and secure funct ioning, in theory profound ly reveals the fr ictio n and wear properties of fr iction inter face is very necessary. The dry gas seal fr ict ion and wear between the contact start and stop asperity asperity phase of the fr ict ion inter face between w ill generate heat, produce will be on the contact sur face adhesive wear damage to the equip ment, dry gas seal gas into the process as impur it ies granules, asperit y contact frict ion ge nerated dur ing abrasive wear adhesive wear. However, from t he micro- leve l cons ideration of dry gas seal interface fr ict ion and wear, use of re levant know ledge and theories, such as: the establishment of the appropriate model of fractal geometry theory, contact theory asperity, finite ele ment ana lys is, probability theory, etc., ana lys is seal fr iction interface characteristics parameters and the impact on dry gas seal performa nce, the main contents and conclusions are as follows:In this paper, fractal theory and Frict ion effects based on previous stud ies asperit y defor mation features body method using microscopic substrate length establis hed asperity frict ion Fractals exposure model, through the rough sur face c ontact model derived dry gas seals start stop phase Running wear, abrasive wear and adhesive wear wear rate of the fractal model of dry fr ict ion and verified us ing MATLA B software based on fractal parameters on the wear rate of the fractal model descript io n to clearly reflect the wear rate increases by three- dimens ional image and a two-dimens iona l graph the fractal dimens ion, characterist ic scale factor, the constant change of materia l properties and wear probability constants, whic h can ana lyze the various factors that affect the wear rate obtained, and thus the device can be optimized in this way, these trends find the minimum wear rate under the optimal parameters. The results show that: when the fractal dime nsio n is wit hin a certain range, w ith t he fract al d imens ion increases, decreases and then increases the lead after wear; optima l fractal 1.5, the wear rate of the minimum d imens ions. When let fractal d imens ion rema ins uncha nged, wit h the scale constant, constant probability increases the wear rate incr eases; and wit h the increase of the wear rate of the materia l properties constant decreases. When all other parameters are kept constant, the greater the contact area wear rate becomes larger. The model for the furt her study of the rough sur face fr ict ion, wear and lubrication is important.The fractal parameters characterization in friction interface morphology characteristics, and according to the previous fractal contact model through calculation and analysis are derived, established the maximum static fr iction force and the fractal model of friction coefficient, and the numerical analysis for the above model. According to the simulation requirements, for the above model has carried on the simple analysis, and combined with the software were analyzed. The research results show that when the other parameters must be friction coefficient with the change of fractal dimension, the fractal dimension of 1.1 < D < 1.2. as the change of fractal dimension, the coefficient of friction between the load and the nonlinear convex curve, but this kind of change is very obvious; When the fractal dimension of 1.2 < D < 1.9. with the increase of fractal dimension, the friction coefficient and the method to present a nonlinear concave curve between load and the change trend is more obvious. When the fractal dimension as a certain value, friction coefficient of the most obvious change.in the analysis diagram can be seen clearly in the fractal dimension in the vicinity of 1.1 changes in the most obvious. In addition. when the fractal dimension unchanged. slightly convex body contact area of the larger the friction coefficient change. Characteristic scale coefficient and the material influence on the static friction coefficient is the performance of the constant with the increase o f method to the load, the static friction coefficient is increased. The maximum static friction force with the method of linear proportional relationship to the increase of load. At the same time, the establishment of the model for the analysis of the performance of the seal friction interface features study laid a theoretical foundation.