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宇宙用液体タンクの液量計測に関する研究

空间液罐液体体积测量研究

基本信息

批准号：
02805049
负责人：
渡邊嘉二郎
金额：
$ 1.34万
依托单位：
Hosei University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

微小重力下での密閉タンク内の残留液量計測に空気圧方式を応用し,その場合の問題を検討した.その結果,(1)微小重力下では液体中に多数の気泡が安定に存在できるが,水程度の表面張力の液体では空気圧方式の誤差にはならない.(2)微小重力下では圧力センサおよび体積変化機構が液体中に埋没することがある.この場合センサの周波数帯域が残留液量により狭ばめられる.圧力センサ受圧面バネ定数が低い場合,特にこの影響が大きい.液体で被われたセンサの固有周波数を高く維持するために,バネ定数の大きな受圧面をもつセンサを選ぶか,体積変化の周期を長くする必要がある.(3)気液2相流体で蒸気分圧が大きく,それに伴いポリトロ-プ指数が大幅に変化する場合には補正が必要である.この場合,液体,気体,温度からポリトロ-プ指数を計算し気体の比熱比の代わりに用いる.揮発性の弱い液体の場合,ポリトロ-プ指数は気体の比熱比にほぼ等しく,そのまま比熱比を用いればよい.(4)タンク系の総合熱時定数に比較して体積変化の周期が十分短い場合,この体積変化は断熱変化過程とみなせる.この場合,直接理論式から液量が計算できる.タンク系の総合熱時定数に比して体積変化の周期が十分長い場合,タンク内の気体は等温変化し,比熱比を1として計算する.以上の計測上の問題点を考慮し,飛行機のパラボリックフライトで実現した機内微小重力環境で液量計測実験を行った.結果は直線性,再現性とも優れた液量計測が可能であることが確認された.従って微小重力下における密閉タンク内残留液量計測の手段として,空気圧方式を利用することの有効性,妥当性が確認された.

Under microgravity, the residual liquid in the air can be calculated by the method of air pressure, and the problem of the residual liquid will be reduced. The results are as follows: (1) under microgravity, most of the foam diazepam exists in the liquid, and the water level is different from that of the surface force, the liquid and the air. (2) under the microgravity, the temperature is low. (2) under the microgravity, the temperature of the body is buried in the liquid. The amount of residual liquid in the cycle number domain is very narrow. The force is affected by the surface, the number of points is low, and it is especially important to make a big difference. The temperature of the liquid is very high, and the temperature of the liquid is very high. The temperature of the liquid is very high, and the temperature of the liquid is very high. The temperature of the liquid is very high, and the temperature of the liquid is very high. (3) the temperature of the liquid 2-phase fluid is very high, and it is necessary to increase the temperature of the liquid phase. Temperature, temperature, In terms of temperature, temperature In order to calculate the amount of liquid, you can use the method to calculate the liquid volume. The temperature of the system is higher than that of the system. The cycle is very long, and the temperature of the body is isothermal, and the ratio is 1. The above check points have been tested, and the passenger car has been able to detect the micro-gravity environmental liquid volume in the machine. Results the accuracy and accuracy of the liquid volume measurement system may be greatly improved. The method of calculating the amount of residual liquid in the micro-gravity, the method of calculating the amount of residual liquid in the micro-gravity, the method of calculating the amount of residual liquid in the micro-gravity, the method of calculating the amount of residual liquid in the micro-gravity, the method of using the micro-gravity method, the method of calculating the amount of residual liquid in the micro-gravity, the method of calculating the amount of residual liquid in the micro-gravity, and the method of empty air.