The biggest drawback of the model is that it ignores the influence of the viscosity of the fluid on the flow. For a scroll compressor, the leakage is a small differential pressure and small gap leakage. In this case, the viscous friction of the fluid affects the flow of the fluid. Big. Therefore, the calculation result is larger than the actual deviation. Since the model uses an ideal nozzle and the result is larger than the actual gas leakage, some people have proposed the idea of ​​correcting the nozzle leakage model. The main idea is to further simplify the model into a finite flow of compressible gas through the ideal nozzle, that is, multiply a flow coefficient based on the flow obtained by calculating the ideal nozzle model. The flow coefficient is generally obtained experimentally. The remaining assumptions and their calculation methods are completely consistent with the nozzle leakage model. Fannuo flow model: This model is a relatively common leakage model of a scroll compressor. Compared with the ideal nozzle leakage model, the biggest difference is to consider the effect of fluid viscosity on fluid flow, which is more realistic for narrow and long tangential leakage channels. The Fannuo flow model is also referred to as a frictional flow leakage model of a compressible fluid through a narrow pipe. It is generally assumed that there is no heat exchange with the outside during fluid flow. The modeled tangential leakage channel becomes a section of a nozzle connected to a straight pipe of equal section. The length of the straight pipe of equal section is determined according to the principle that the friction effect remains equal before and after the modeling. A leak model based on the principle of fluid flow. For the flow of pure gas flowing through the small gap, the continuous equation, the two-dimensional equation and the gas state equation are used. The viscosity, compressibility, inertial force and the influence of the motion boundary on the flow are considered, and the theoretical analysis is established. A two-dimensional equation-based leakage mathematical model is solved by programming to obtain a more accurate numerical solution. The raw material for making the tray, double-sided silicone oil, is not easy to stick, good quality, high transparency
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August 23, 2024