The supersonic separation is a new approach to dehydrate the natural gas in recent years. In the conventional supersonic separator, a cyclone or a delta wing is employed to generate the swirling flow. Unfortunately, the separation efficiency of conventional supersonic separator is low. In order to overcome the disadvantages, helical guide blade was designed to incorporate into the swirling device which is fixed in the middle of the separation straight tube in this paper. The computational fluid dynamics modeling was performed to investigate the flow characteristics in the supersonic separator and optimize the structure of the blade. The swirling flow generated from the blade promoted the separation of the droplets from the gas. The optimization results showed that a pitch of 200 mm and a single blade are the best geometry structure for the swirling device in the supersonic separator in the dehydration process, which can create the stable flow field and benefit the separation effect.
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