Method for simulating spray mixing in low-temperature propellant storage boxes
A low-temperature propellant and simulation method technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problems of lack of storage tank pressure, air pillow temperature, fluid form and spray form simulation methods, etc., to achieve accurate Pressure change trend, good fit, and effect of improving calculation efficiency
A low-temperature propellant and simulation method technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problems of lack of storage tank pressure, air pillow temperature, fluid form and spray form simulation methods, etc., to achieve accurate Pressure change trend, good fit, and effect of improving calculation efficiency
CN107871046AActive Publication Date: 2018-04-03BEIJING INST OF ASTRONAUTICAL SYST ENG +1
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[0111] (1) Establish a grid for spray mixing in a large liquid hydrogen storage tank under microgravity;
[0112] (2) Program the evaporation / condensation model, the heat and mass transfer model between the droplet and the continuous phase, and the conversion model between the droplet and the continuous phase into the FLUENT software, define the physical properties of liquid hydrogen and oxygen, and open the energy and composition Divide the model, add the discrete phase, and set the physical property of the discrete phase to liquid hydrogen, open the VOF model, check the implicit body force, and complete the setting of the discrete phase and VOF method;
[0113] (3) Define the nozzle type, position, speed as 0.1m / s, injection temperature as 20K, flow rate as 3.9×10 -5 kg / s. Initialize the process, start the simulation calculation, and obtain the fluid behavior characteristics (including tank pressure, temperature distribution and other parameters) in the tank under this grou...
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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....
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Patent Timeline
03 Apr 2018
Publication
CN107871046A
- IPC
- G06F17/50
- CPC
- G06F30/20; G06F2119/06; G06F2119/08
- Inventors
- 王夕; 罗庶