Improving flow path of the axial screw stages using the multiphase coefficients

The paper proposes the refined coefficients and ratios of the geometric dimensions that form the basis of a methodology making it possible to design and develop the high-pressure multiphase stages operating on water and gas-liquid mixture. All the coefficients used in the methodology for computing the new multiphase stages flow path are derived for a stage operating on the clean working fluid without gas. Coefficients applied to assess the multiphase stage operation on a gas-liquid mixture are informative in nature. The paper shows that two parameters should be known to design and develop a new multiphase stage; they include the local static pressure coefficient and the local multiphase velocity coefficient. The first coefficient determines the recommended pressure drop at the local section boundaries; the second coefficient determines detailed distribution of the flow path geometric parameters inside this section. Both coefficients are making it possible to compute the impeller flow path geometric dimensions. The paper presents recommendations for selecting values of the coefficients used in design and development of new multiphase axial screw stages. It provides an example of design and development of a new high-pressure multiphase axial screw stage operating on pure liquid and gas-liquid mixture.
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