Liquid hydrogen supercooling degree acquiring device

Abstract

A liquid hydrogen supercooling degree acquiring device comprises a compressor. An outlet of the compressor is connected with an inlet of a precooling heat exchanger connected in a precooling system. An outlet of the precooling heat exchanger is connected with an inlet of a throttling gear. An outlet of the throttling gear is connected with an inlet of a bubbling device. The bubbling device is located in liquid hydrogen of a supercooler. A gas hydrogen outlet of the supercooler is connected with an inlet of a separation device. A hydrogen outlet of the separation device is used for hydrogen recovery. A helium outlet of the separation device is connected with an outlet of a fourth valve and an inlet of a fifth valve. An inlet of the fourth valve communicates with helium. An outlet of the fifth valve is connected with the inlet of the compressor. According to the liquid hydrogen supercooling degree acquiring device, the process of bubbling refrigeration and the process of adiabatic throttling refrigeration are combined together, a hydrogen recovery system is considered, and therefore the cost for acquiring the supercooling degree of liquid hydrogen is greatly reduced, supercooling time is shortened, the main liquid hydrogen boiling degree is weakened, vibration of the supercooler is reduced, and distribution of a liquid hydrogen temperature field is more uniform.

Description

technical field [0001] The invention relates to the technical field of low-temperature propellant supercooling, in particular to a liquid hydrogen supercooling acquisition device. Background technique [0002] Cryogenic propellants (such as liquid hydrogen, liquid oxygen, liquid methane, etc.) have become the most widely used group of propellants for large launch vehicles due to their advantages of non-toxicity, pollution-free, low cost, high specific impulse, and high thrust. The specific impulse is 30% to 40% higher than that of normal temperature propellants. At present, most of the thermodynamic states of low-temperature propellants are around the boiling point, and their thermophysical properties are obviously insufficient, especially for liquid hydrogen. The outstanding disadvantages are: low density and sensible cooling per unit volume. In order to improve the thermodynamic performance of the low-temperature propellant, supercooling is used to improve the deficiency ...

AI Technical Summary

Problems solved by technology

At present, most of the thermodynamic states of low-temperature propellants are near the boiling point, and their thermophysical properties are obviously insufficient, especially for liquid hydrogen. The outstanding disadvantages are: low density and sensible cooling capacity per unit volume

When the pumping speed of the vacuum pump is increased, it will bring two fatal consequences to the system: ① It will cause the storage tank to vibrate violently. Due to the increase of the pumping speed, the pressure of the air pillow in the storage tank will decrease rapidly, and the gas-liquid interface in the storage tank will occur. Violent boiling, like water boiling in an electric kettle, causes strong vibrations in large storage tanks, which can cause loose screws and parts to fall, or cause resonance, weld cracks, and low-temperature propellant leakage; ② cause low-temperature propellant The temperature is seriously stratified, especially near the triple point. Due to the fast pumping speed, the liquid at the gas-liquid interface in the storage tank will freeze, and the liquid at the bottom is actually not supercooled.

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