论文部分内容阅读
目的研究微重力下工位送风对乘员工作区空气品质的影响,为载人航天器座舱通风系统设计提供参考。方法为评价工位送风的性能,首先提出了工位送风评价指标——工位区空气新鲜度比,然后采用商业计算流体力学(CFD)软件以双侧送风为背景空调,分析了不同工位送风量和出风速度对舱内乘员工位区空气品质的影响。结果得出了不同工位送风量和出风速度下的CO2浓度、空气龄、工位区空气新鲜度比和工位区风速分布情况,以及有无工位送风下工位区的空气品质的比较结果。结论研究表明,工位送风利用小风量就可以达到局部环境与较大风量相当,符合航天器轻量化的要求,故在航天器内增加工位送风是非常有意义的。同时,模拟结果表示,在相同总风量下加大工位送风量后,工位区的几项性能指标均有所改善;在工位风量一定的情况下,CO2浓度、空气龄和新鲜度比随风速提高改善并不明显,不过工位区风速会有明显提高,有助于改善沉闷感。
Aim To study the influence of station air supply on the air quality in passenger work area under microgravity so as to provide reference for the design of ventilation system of manned spacecraft cockpit. Methods In order to evaluate the performance of station air supply, firstly, the evaluation index of station air supply - air freshness ratio in station area was put forward. Then commercial CFD software was used to air-condition with bilateral air supply as the background, Effect of Air Supply and Air Velocity at Different Stations on Air Quality of Cabin Staff. Results The CO2 concentration, air age, air freshness ratio in work station and wind speed distribution in work station at different working positions were obtained, as well as the presence or absence of air in work station under working air supply Quality comparison results. Conclusions The research shows that it is very significant to increase the station air supply in the spacecraft by using the small air volume at the station for air supply to achieve the local environment equivalent to the larger air volume and to meet the light weight requirements of the spacecraft. At the same time, the simulation results show that after increasing the air volume of the station under the same total air volume, several performance indexes of the station area have been improved. Under certain air volume at the station, the CO2 concentration, air age and freshness ratio With the wind speed to improve the improvement is not obvious, but the work area wind speed will be significantly improved, help to improve the sense of boring.