Abstract
The drag compressor plays an important role in the turbo-drag pumping process, but its theory has not been perfect so far. According to traditional theory, the compression ratio tends to infinity with increasing drag velocity which leads to a great error. The performance of a disc drag compressor in the free molecular range flow has been studied using the matrix-probability method which can satisfy the complicated boundary conditions. A three-dimension dynamic model for a gas molecule passing through a channel was defined and moving coordinate systems were employed to describe the molecule motion and improve the calculating accuracy. An explanation of why the transmission probability of gas molecules through the pumping channel tends to a constant value with increasing drag speed is given.
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