Method for measuring quantity of liquid propellant in storage tank

Abstract

The invention provides a method for measuring a quantity of a liquid propellant in a storage tank, which comprises the following steps of: step S1, measuring initial pressures and temperatures of the storage tank and a gas cylinder and forecasting an initial gas volume V0 and a quantity m10 of the residual liquid propellant in the storage tank by utilizing a propellant quantity static measurement method; step S2, establishing a heat and mass transfer mathematical model used in the pressurizing process of a storage tank open system and carrying out simulation calculation by utilizing the measured initial conditions so as to obtain a relation that a gas phase temperature and a gas phase pressure are changed with time and the propellant quantity in the storage tank; step S3, injecting pressurizing gas into the storage tank by the gas cylinder, enabling holding time to be consistent with simulation calculation time and keeping a pipeline having excellent sealing performance; step S4, measuring a gas pressure and a gas temperature of the gas part in the storage tank at a preset moment and comparing the gas pressure and the gas temperature with a simulation result; and step S5, fitting actual propellant flow according to the simulation result and an experimental result and calculating the quantity of the residual propellant in the storage tank at any moment by a formula shown in the description under the condition of the known initial propellant quantity.

Description

technical field [0001] The invention relates to the field of measuring the propellant dose of a tank of a spacecraft, in particular to a method for measuring the liquid propellant dose of a tank. Background technique [0002] Propellant dose information is of great significance in the fields of aerospace and low temperature. The amount of liquid propellant dose of a spacecraft is directly related to the life of the spacecraft and the arrangement of the mission of the spacecraft. The amount of propellant in the box. For example, in deep space exploration missions, when the aircraft is in the stage of free flight around the earth without power and when it leaves the earth orbit, the engine needs to be restarted once or even multiple times. Therefore, it is necessary to ensure that there is enough propellant before performing the detection mission, and to accurately predict the orbital maneuverability of the vehicle, so that a high-precision, stable and reliable liquid propell...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-precision real-time measurement method for measuring the propellant dose of the liquid propellant in the tank to solve the problem in the prior art when the external pressurized gas enters the tank and the propellant flows out of the tank. The problem that the remaining propellant dose cannot be dynamically measured

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