An enhanced midstream design method for cryogenic turbomachinery. (January 2021)

• Record Type: Journal Article
• Authors: Jadhav, Mohananand M.; Chakravarty, Anindya; Atrey, M.D.
• Is Part Of: Cryogenics. Volume 113(2021)
• Publication Date: 2021-01
• Subjects: Midstream design -- Cryogenic turbomachines -- Non-idealities -- Flow angle deviation -- Property variation -- Profile defects -- Blockage -- Aerofoil -- Blade loading -- Splitter blades; Low temperature engineering -- Periodicals; Low temperature research -- Periodicals; 536.56
• DOI: 10.1016/j.cryogenics.2020.103237
• Languages: English
• ISSNs: 0011-2275

Abstract

Highlights: Enhancement on the formulation of the midstream method for turbomachinery design. Incorporation of non-idealities: inefficiency, flow angle deviation, gas property variations, blockage. Turbomachinery impeller length shortening, use of aerofoils, removal of profile defects. Splitter blades design, aft splitter, splined splitter. Parametric study of graphical schedules, design through blade loading, Enhancement algorithm. Abstract: An enhanced midstream design method for cryogenic turbomachines is presented in this article by reformulating that given by Hasselgruber and Balje. The enhanced formulation incorporates non-idealities such as turbomachinery inefficiency and flow angle deviation. Moreover, certain other issues faced by high speed cryogenic turbomachinery operating in low temperature domains, such as those arising due to gas property variations and impeller length shortening from rotordynamic considerations, have also been addressed. In the enhanced design method proposed in this article, to start with, graphical schedules of various flow and profile parameters are used to rectify the defects arising in the turbomachine profiles, followed by design accomplishment through blade loading specifications. The average blade loading is arrived at by incorporating effects of splitter blades and spanwise blade geometry. The effects of blockage due to blade thickness and splitter blades are also incorporated in the formulation. The proposed design method proceeds through a parametric study of the graphical schedules on the impeller profile followed by subsequent enhancement of the impeller geometry through a framed algorithmic procedure.