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Comparison of the Simulated and Measured Machine Characteristics of a Roots Vacuum Pump in Fine Vacuum

Title: Comparison of the Simulated and Measured Machine Characteristics of a Roots Vacuum Pump in Fine Vacuum
Autor(en): Prof. Dr.-Ing. K. Kauder, Dipl.-Ing. D. Stratmann
erschienen: 2006
in: VDI-Berichte 1932, S. 177- 192, VDI-Verlag, Düsseldorf, 2006
Abstract his paper presents the enhancement of the simulation software KaSim, integrating new models to increase modelling accuracy and to extend the application area to fine vacuum conditions.

 

The main objective of the software KaSim is the simulation of the thermodynamic behaviour of positive displacement vacuum pumps within the design and development process. The verification of the program has already been successful for rough vacuum conditions. In fine vacuum additional physical effects - not modelled so far - become predominant in the machine characteristics. On the one hand the influence of moving clearance boundaries on the characteristics of leakage flows is taken into account. Therefore the molecular clearance flow is simulated and analysed using a Monte-Carlo method. And on the other hand, further losses mainly caused by sorption and desorption are modelled via a heuristic approach derived from the experimental studies.

 

The operating behaviour of an industrial Roots vacuum pump is analysed varying several parameters (operating pressures, rotor speed, clearances). The comparison of simulated and measured machine characteristics for a vacuum booster in the fine vacuum region provides a validation of the enhanced program KaSim.

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