The radial leakage model radial leakage model is also diverse, including the small hole leakage model in tangential leakage, the Fanno flow model and the pure gas two-dimensional NS equation model are also applicable to radial leakage, the principle and calculation method steps. They are all the same, but the specific geometric parameters are different. In addition, the radial leakage model has the following types. (1) Gap flow model between stationary parallel plates: Many leakage gap values ​​in scroll compressors are small relative to the length of the leakage channel, so it can be regarded as the flow in the parallel plate gap; and because of the two scrolls The direction of motion is perpendicular to the direction of leakage and has little effect on radial leakage, so it can be seen as a leak between stationary parallel plates. By analyzing the force of the micro-body of the fluid and adding the boundary conditions, the velocity distribution of the fluid can be obtained, and the leakage amount of the lubricating oil can be further determined. This method takes into account the viscous effect of the lubricating oil, and the establishment and solution of the model are relatively simple, which is a relatively common radial leakage model. (2) Gap flow model between the involute ring and the plate: This is a radial leakage model suitable for a homogeneous flow in which the leakage medium is a pure gas or a gas phase. The direction of fluid flow in the gap flow model between stationary parallel plates is parallel, but the radial leakage of the actual scroll compressor is a flow along the normal direction of the involute, which is not parallel to each other. This proposed flow of fluid-compressible fluid through the gap between the involute half-ring and the plate takes this into account and simulates it as a radial flow that diverges in the radial direction. During the flow of the fluid, the gap is small due to the viscosity, so the flow is assumed to be laminar. This leakage model generally assumes that the temperature of the fluid remains constant during the flow, ignoring the relative motion of the two scrolls, and only considering the leakage flow caused by the differential pressure. Under these assumptions, a fluid micro-element is analyzed by fluid mechanics to establish an equation, and the boundary condition can be used to find the leakage amount. It is also because the equation of state is used in the solution process, so the model is not suitable for the leaking flow of the leakage medium mainly in the liquid phase.
Looking at the research status of the scroll compressor leakage, the author believes that the problems to be solved and the development direction in the future are: (1) The study of the leakage fluid state mainly depends on the running time and the influence of the temperature change on the fluid flow state. . (2) Determination of the gap value. At present, whether the radial gap or the axial gap is processed as a constant, it is necessary to find a method for determining the gap value more accurately. (3) The leakage problem of oil-free scroll compressors, due to its particularity, its leakage problem has not been solved very well, and further research is needed.
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