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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

从空间站等封闭环境供氧回收的角度，实验研究了微重力条件下蓝藻栽培田形成的可能性。北海道国家工业研究所（HNIRI）的10米高的落差塔和日本微重力中心（JAMIC）的500米高的落差塔被用来创造微重力环境。HNIRI和JAMIC跌落塔的微重力周期分别约为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跌落塔实验装置的尺寸为870Dx425Wx918H和425Dx425Wx918H。反应器的直径为0.055 ~ 0.13m，体积为8.5 × 105 ~ 1.3 × 10 ~ 3 m3。在反应器侧面安装8mm摄像机，用于观察和记录液滴过程中气液界面的变化。字符生成器用于在磁带上记录掉落时间。在下降塔产生的微重力作用下，一个部分装满水的圆柱形容器被旋转以形成较低的离心力（在容器的壁侧大约为10^<-1>G）。观察并记录了在一定转速下气液系统的界面形状。研究了容器直径、转速、液体体积、液体粘度和表面张力对界面形状的影响。中空流的形成被认为是适合于供氧回收系统的一种形式，即气相位于容器的中心，气水界面与容器的底部和顶盖都有接触。在旋转容器内的微重力气液体系地层图中，划分了可能形成空心流的区域和不可能形成空心流的区域，表明微重力下空心流的形成可以用韦伯数和液体/容器体积比来预测。由地层图可知，当We=8, V_1/V_T=0.80时，获得了最佳条件。因为功率消耗，即船舶的转速，变成了最小值。少