The Performance Research Of Spiral Groove Gas Face Seals At Slow Speed

High speed spiral groove gas face seals is being applied more and more in the important industry departments, such as petroleum, natural gas, chemical and aircraft industry. But the analysis of the gas face seals operating at the slow speed and low pressure conditions is rare. As the requirement of the research and production of SBS, this paper will develop the technology of the gas face seals according to the real work conditions of the reactor.In the analysis of the steady-state performance at the slow speed and low pressure conditions, a new conception of slip flow will be introduced, two-dimensional model is created and the control equation is deduced. This dissertation attempts to discrete the control equation using finite element methods (FEM) without simplification. And the discrete equation is solved by a numerical iteration. The result shows the characteristic parameters of the seals are more accurate.According to the numerical method of the discrete equation,the calculating software is designed. This dissertation discusses the effects of various spiral groove gas face seals parameters (geometry parameters and operating parameters) on the seal performances according to the result of the software. Some universal laws are drawn which can guide the engineering design.A new set of experimental has been set up and the experiment has been finished. A new method of measuring the thickness of the gas film is used. By comparing the calculating results of this dissertation with the results of the experiment, the correctness of the theoretical analysis and the calculating software is proved.In a word, by deeply studying the performances of the spiral groove of gas face seals at low speed and low pressure, this dissertation offers theoretical support for the engineering design and application. And a theoretical basis is made for the further study such as dynamic stability, mechanical and thermal deformations.