Abstract
A heat pump in the aerospace industry can significantly reduce the area of radiator by elevating the rejection temperature. Especially for a Lunar base, the heat pump can improve the heat rejection capability of the thermal control system to adapt the high-temperature environment. However, gravity on the Lunar (about 1/6 g) may have an adverse impact on a gas-oil separator of the heat pump, and solving this problem is the key for a heat pump used on Lunar base. At present, the gas-oil separator all based on gravity separation theories, the researches under low or micro gravity were blank. In this work, a gravity separation model based on a single-particle principle was built, and the effects of the vapor velocity, the oil droplet initial velocity, and the oil droplet diameter were investigated under normal gravity. Then the variations of the separation efficiency under Lunar gravity were discussed and the numerical calculation results showed that the separation efficiency was reduced when the vapor velocity or droplet initial velocity increased in a certain height of the separator whenever under normal or Lunar gravity. Particularly, the separation efficiency under Lunar gravity was reduced from 99% to 55% than it under normal gravity.
Highlights
Human space flight and deep space exploration had moved rapidly, First Lunar Outpost Lander and Permanent Lunar Base will be the phase
According to the requirements of the Lunar base missions in future, the heat pump system is a bridge between the two-phase mechanical pumped loop inside the base and the radiator outside the base, the calculation results of the thermodynamic cycle are shown in Figure 3 and the status parameters obtained by NIST Reference Fluid Thermodynamic and Transport
According to equation (8), under normal gravity the Reynolds number against time is shown as Figure 4, and the droplet velocity versus time with different semi-empirical correlation expressions of drag force coefficient is shown as Figure 4
Summary
Human space flight and deep space exploration had moved rapidly, First Lunar Outpost Lander and Permanent Lunar Base will be the phase.
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