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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的氧气供给和回收的观点出发，利用北海道产业综合研究所（HNIRI）的10 m高的落塔和日本微重力中心（JAMIC）的500 m高的落塔，对微重力环境下形成蓝绿色藻养殖场的可能性进行了实验研究。HNIRI和JAMIC落塔提供的微重力周期分别约为1.2秒（g_2/g_0<10^<-3>G）和10秒（g_2/g_0<10^<-4>G）。HNIRI落塔实验装置的尺寸为600 Dx 425 Wx 910 H，JAMIC落塔实验装置的尺寸为870 Dx 425 Wx 918 H和425 Dx 425 Wx 918 H，反应器的直径和体积分别为0.055 - 0.13m和8.5x105 - 1.3x10 -3 m3。在反应器的侧面安装了一个8 mm的摄像机，用于观察和记录气液两相的变化 ...更多信息界面在下降。使用字符发生器在磁带上记录下落时间。在下落塔中产生的微重力下，旋转部分填充有水的圆柱形容器以形成低离心力（在容器壁侧约为10 μ <-1>G）。观察并记录了不同转速下的气液界面形状。考察了反应器直径、转速、液体体积、液体粘度和表面张力对界面形状的影响。研究认为，中空流结构适合于氧回收系统，空气相位于容器中心，气水界面与容器底部和顶盖接触。在微重力旋转容器气液两相流形成图中，明确划分了可能和不可能形成空心流的区域。该图表明，微重力下空心流的形成可以通过Weber数和液/容器体积比来预测。由生成图可知，当We=8，V_1/V_T=0.80时，得到最佳条件。因为功率消耗，即容器的旋转速度，变得最小。少