动静涡旋端面摩擦副摩擦力分形预测模型

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Frictional loss is a key factor that influences the performance of fluid machine.In order to reveal the friction-wear mechanism and its influence factors,according to the configuration,compression process and force analysis of scroll fluid machinery,a prediction friction force fractal model for rubbing pairs with fixed and orbiting scroll faces was derived based on M-B fractal model,sliding friction force fractal prediction model and analysis of real microcosmic contact form and force of fixed and orbiting scroll faces.Verification and analysis of the model were made through an example.The results showed that there was an optimum fractal dimension of scroll surface,on this optimum fractal dimension,friction force was reduced with the decreases of G＊and A＊r,so the friction resistance would be reduced through improving the contact properties of fixed and orbiting scroll faces so as to enhance operational performance and prolong working life of fluid machine.引言
涡旋式流体机械是一种新型、高效的容积式流体机械,广泛应用于制冷、动力工程等领域。由于涡旋流体机械特殊的结构形式和运行方式,其内部的摩擦损耗在很大程度上影响着涡旋流体机械的效率和性能。