Method for simulating spray mixing in low-temperature propellant storage boxes

Abstract

The invention relates to a method for simulating spray mixing in low-temperature propellant storage boxes, belongs to the field of space transportation overall design, has a background of carrying outlong-time in-orbit evaporation capacity control on low-temperature propellants, and mainly relates to a method for simulating long-time in-orbit storage box pressure control on low-temperature propellants by adoption of a spray mixing manner. For calculation of spray and two-phase flows, a dispersed phase and VOF combined method is adopted to establish a computational fluid mechanics simulation model for spray mixing in low-temperature propellant storage boxes; results obtained through the method is favorably identical with experiment results; compared with simple lumped parameter models, themethod is capable of predicting fluid forms, temperature changes and heat exchange trends in the storage boxes; and through the method, simulation design can be carried out on the spray mixing underdifferent flows, flow velocities and spouting temperatures, and a spray mixing optimization scheme is brought to make a contribution to improve long-time in-orbit low-temperature propellant storage box pressure ability and realizing a long-time in-orbit evaporation capacity control technology for engineering.

Description

technical field [0001] The invention relates to a simulation method for spray mixing in a low-temperature propellant storage tank, and belongs to the technical field of overall design of aerospace vehicles. Background technique [0002] Cryogenic propellants refer to liquid propellants with a boiling point lower than 112K at atmospheric pressure, such as liquid hydrogen, liquid oxygen, methane, etc. Cryogenic propellants have the advantages of high specific impulse performance, non-toxic and non-polluting, but low-temperature propellants have a low boiling point, are easily vaporized by heat, and are difficult to store. Urgent needs. The third sub-stage of my country's future heavy rockets uses liquid hydrogen and liquid oxygen propellants. The long-term on-orbit time requirement for low-temperature propellants is 5 days, in which the evaporation of liquid oxygen is required to be less than 0.17% per day, and the evaporation of liquid hydrogen is required to be less than 2....

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have done some research on the prediction of evaporation of low-temperature propellants under passive control schemes under ground conditions. However, for the simulation of active control schemes, especially the simulation of spray blending, there is still a lack of effective prediction of tank pressure and gas pressure. Simulation method of pillow temperature, fluid form and spray form

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