Oxygen Supply and Recovery System for Closed Environment such as a Space Station.-Fromation of blue-green algae Cultivated Field under Microgravity-

空间站等封闭环境的供氧及回收系统-微重力下蓝绿藻培养田的形成-

基本信息

批准号：
08651084
负责人：
ANDO Koji
金额：
$ 1.47万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

From the viewpoint of oxygen supply and recovery in the closed environment such as a space station, the formation possibility of the blue green algae cultivated field under microgravity was experimentally investigated.The 10m-high drop tower at the Hokkaido National Industrial Research Institute (HNIRI) and the 500m-high drop tower at the Japan Microgravity Center (JAMIC) were used to create the microgravity environment. The HNIRI and the JAMIC drop towers provided a microgravity period of approximately l.2s (g_2/g_0<10^<-3>G) and 10s (g_2/g_0<10^<-4>G), respectively. The dimensions of the experimental setup at the HNIRI drop tower are 600Dx425Wx910H.The dimensions of the experimental setup at the JAMIC drop tower are 870Dx425Wx918H and 425Dx425Wx918H.The diameter and volume of reactor ranged from 0.055 to 0.13m and from 8.5x105 to l.3xl0-3 m3, respectively. An 8mm video camera was fixed on the lateral part of the reactor and was used to observe and record the change in the gas-liquid … More interface during the drop. The character generator was used to record the drop time on the tape.A cylindrical vessel partially filled with water was rotated to form low centrifugal force(approximately, 10^<-1>G at the wall side of the vessel) under microgravity created in the drop tower. The interface shape of the gas-liquid systems in a rotating speed of the vessel was observed and recorded. The effects of diameter and rotating speed of vessel, liquid volume, liquid viscosity and surface tension on the interface shape were investigated. Hollow flow formation was considered to be suitable for oxygen supply and recovery system that an air phase was located in the center of the vessel and the air-water interface contacted with both the bottom and the top-cover of the vessel. The possible and/or impossible regions to form the hollow flow in were dearly divided in the formation map for the microgravity gas-liquid systems in a rotating vesseL The map indicates that the formation of the hollow flow under microgravity could be predicted by the Weber number and the ratio of the liquid/vessel volume. We concluded from the formation map that the optimum condition was obtained when We=8 and V_1/V_T=0.80. because a power consumption, namely, the rotating speed of the vessel, became a minimum. Less

从空间站等密闭环境中供氧和回收的角度出发，实验研究了微重力下蓝绿藻培育场的形成可能性。北海道国立产业研究院（HNIRI）的10m高落塔日本微重力中心（JAMIC）的 500m 高落塔用于营造微重力环境 HNIRI 和 JAMIC 落塔提供了微重力。周期分别约为 l.2s (g_2/g_0<10^<-3>G) 和 10s (g_2/g_0<10^<-4>G) HNIRI 落塔实验装置的尺寸为 600Dx425Wx910H。 .JAMIC 落塔实验装置的尺寸为 870Dx425Wx918H 425Dx425Wx918H。反应器直径和体积分别为0.055～0.13m和8.5x105～l.3xl0-3m3。反应器侧面固定8mm摄像机，用于观察和记录变化。在跌落过程中的气液界面中，使用字符生成器记录磁带上的跌落时间。部分装满水的圆柱形容器在落塔中产生的微重力下旋转以形成低离心力(在容器的壁侧大约10^-1G)。气液系统的界面形状。观察并记录容器的转速、液体体积、液体粘度和表面张力对界面形状的影响，认为适合氧气。供应和回收系统中，空气相位于容器的中心，并且空气-水界面与容器的底部和顶盖接触，其中可能和/或不可能形成空心流。旋转容器中微重力气液系统的形成图明显分开。该图表明，微重力下空心流的形成可以通过韦伯数和液体/容器体积比来预测。形成图当We=8且V_1/V_T=0.80时，获得最佳条件，因为功率消耗，即容器的转速，变得最小。