Numerical Simulation For Iflm Properties In Static Circular Groove Dry Gas Seals

Dynamic pressure dry gas seal in high spindle speed of compressor and pumpusing fluid pressure to be more open and gas film stiffness, with spiral groove dry gasseal for a typical application is a great success. In low-speed mixing classes ofmachines such as reactor, makes it difficult to guarantee the stability of dynamicpressure dry gas seals run. Static pressure dry gas seal suitable for low-speed rotationmachines of a new sealing structure, with the depth of research, It will be applied tomore in rotating machines.With the perspective of fluid mechanics, three-dimensional geometric model ofstatic pressure gas seal with four different throttle apetures were established by usingSolidworks software and meshed by using software Gambit. The flow field near its endsurface was simulated numerically with software Fluent to obtain pressure distributionvelocity distribution, leakage, and gas film-opening of seal performance parameterswere gained. Analyzed the different types of the film thickness, get the influence lawof sealing performance parameters and get the best choice. At the same time, and thenget the relationship of the gas film thickness and open forces, through the Fluentcalculate gas membrane open force. At last, calculates and analyzes the stiffness andgas membrane thickness relationship. The main contents and conclusions aresummarized as follow:1. Three-dimensional geometric model of static pressure dry gas seal with fourdifferent throttle apertures were established by using Solidworks software, which weremeshed by Gambit software. Space flow of static pressure dry gas seal was simulated,then, pressure distribution, velocity distribution, leakage and film opening force ofSpace flow were gained.2. In the same specific conditions, The distributions of the pressure and velocityof the flow field, and leakage under different film thickness were obtained through thesecond numerical simulations after the film thickness were changed. And analyses thegas film thickness in the same situation, the influence of static gas seal.3. The stability and reliability of static circular dry gas seal operation depends onof the size of stiffness film, so gas film stiffness is important to for maintaining thestability of static circular gas seal. In the same specific conditions, internalmicro-circular three-dimensional space flow of six different gas film thickness weresimulated by the software of Fluent, and then the flow field pressure distribution andradial pressure distribution were gained. So firstly, gas film thrust of different gas film thickness were obtained through static pressure, then gas film thrust polynomial aboutgas film thickness was gained through applying least-squares rule to fit, last but not theleast, gas film stiffness polynomial about gas film thickness was obtained.