Construction method for hydraulic loss calculation model of circular ring region of double-pipe heat exchanger

The invention discloses a construction method for a hydraulic loss calculation model of a circular ring region of a double-pipe heat exchanger, and relates to actual engineering project parameter collection including the length of the double-pipe heat exchanger, the pipe diameter of an inner pipe, the pipe diameter of an outer pipe, circulating flow and pressure loss. Model variable setting: performing digital modeling according to a double-pipe heat exchanger form and parameters adopted in an actual engineering project, and keeping parameter setting of a digital model consistent with parameters acquired by actual engineering through necessary model calibration or parameter identification; according to the numerical calculation part, a Reynolds average method is adopted for turbulent flow modeling, circular ring region turbulent flow is divided into different flow sub-regions based on different flow characteristics of an inner region and an outer region of a wall surface, and speed types of the different sub-