PURPOSE: To enhance the convergency of repeated calculations by calculating the correcting amount of speed from the difference between the average mass flow rate of cross sections in an analyzing space and the mass flow rate at an adjacent cross section or a reference cross section in an analyzing part of the correcting amount of mass.
CONSTITUTION: An analyzing part 15 for analyzing the correcting amount of pressure from the pressure distribution and speed distribution each calculating grating in the analyzing space obtained by a pressure analyzing part 13 and a momentum analyzing part 14 approximates and corrects the pressure or speed based on the law of conservation of mass. An analyzing part 16 for analyzing the correcting amount of mass calculates the physical amount including at least the temperature except for the pressure and the speed, and corrects the speed for each cross section in the analyzing space with the use of the law of conservation of mass. When the correcting amount of speed is to be calculated from the difference between the mass flow rate of each cross section and the mass flow rate of an adjacent cross section or a reference cross section, if the sum of the mass flow rate of the calculating gratings in each cross section is not larger than a limit flow rate, an absolute value of the mass flow rate of the calculating gratings of the cross section is not proportionally distributed, but the mass flow rate is equally distributed to all the calculating gratings.
NAGATA YOICHI
HATTORI NOBUHIRO
KODAMA HISASHI
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