Abstract:
passive propellant management system for a spacecraft liquid propellant tank (1) comprises several preferably V-shaped channels (2) which communicate liquid propellant from regions within the tank (1) to an outlet port (8), which expels liquid propellant but not pressurant gas. A liquid/bubble chamber assembly (9) couples the channels (2) with the outlet port (8). The channels (2) comprise relatively open portions (11) and relatively closed portions (10). In the relatively open portions (11), liquid is retained in a gap (12) between open ends of the V channels (2) and the inner wall of the tank (1 ). In the relatively closed portions (10), a screen, mesh or perforated plate (14) covers the open end of the V channels (2), intermediate the V channels (2) and the inner wall of the tank (1). The placement of the relatively open and closed portions (11, 10), respectevely is intentionnally preselected based upon mission requirements. Where pressurant gas ullage is expected to be present, e.g., during period of high g, relatively open portions (11) are used. Where liquid propellant is expected to be present, e.g., during periods of relatively low g, relatively closed portions (10) are used. The liquid/bubble chamber assembly (9) comprises a liquid trap (27) and bubble trap (28), which operate synergistically with each other and with the channels (2) to provide optimum liquid flow during all phases of the spacecraft mission.
Abstract:
A method and system for tank overfill prevention comprising the steps of supplying fluid to the interior of the tank by means of a dispenser, measuring the dispenser pressure P d and flow rate α, determining at equal time increments 8t a number of quantities representing tank pressures from the said dispenser pressure and flow rate measurements, and deriving from the said determined quantities representing tank pressures, another quantity representing the rate of increase of tank pressure with respect to time, comparing the quantity thus obtained with a preset critical value, and shutting off the fluid supply, if this said quantity exceeds the said preset critical value and if the said flow rate α is less than a preset critical value.
Abstract:
Ein druckfester Flüssiggastank für Kraftfahrzeuge besteht aus zwei parallelen zylindrischen Schalen (50, 51), von denen eine vollzylindrisch ausgebildet ist und mit ihrem innerhalb des Tanks liegenden Teil eine Zwischenwand mit Durchbrüchen zur Verbindung der beiden Tankkammern bildet. Stirnseitig werden die beiden Schalen (50, 51) durch Kappen abgeschlossen, deren jede von zwei Halbböden (53, 55) gebildet wird. An der Übergangsstelle zwischen den Schalen (50, 51) und den Kappen wird der Tank von zwei Rohren (57, 58) durchsetzt, die ebenfalls innerhalb des Tanks mit Durchbrüchen versehen sind und daher Teil des Tankvolumens bilden. Die Zwischenwand ist mit ihren beiden freien Kanten an diesen Rohren (57, 58) angeschweisst. Sowohl die Zwischenwand als auch die Rohre bilden Zugelemente, die dem gesamten Tank eine hohe Druckfestigkeit verleihen. In einem Rohr (58) kann in einem nach innen versetzten Deckel eine Tankarmatur angeordnet sein, die sich somit innerhalb des Aussenprofils des Tanks befindet und durch eine Kappe (62) nach aussen verdeckt ist.
Abstract:
Le dispositif de stockage comporte: une enceinte (10) contenant un liquide et un gaz de pressurisation et un dispositif de sortie de liquide (20) comprenant une structure (21) constituée par des éléments rigides qui définissent une surface intérieure ajourée formant barrière de gaz et délimitent un passage central de sortie (16) et qui délimitent des espaces dont la largeur croît en fonction de la distance au passage central depuis une valeur minimale choisie pour ladite barrière de gaz, jusqu'à une valeur maximale choisie pour empêcher le liquide contenu dans la structure d'être expulsé dans l'enceinte tant que l'accélération ne dépasse pas un seuil donné, la structure constituant un réservoir-tampon duquel le liquide peut être extrait par le passage central sous l'effet du gaz lors de chaque phase d'utilisation et qui est réalimenté en liquide contenu dans l'enceinte au moyen d'un dispositif d'alimentation (15) qui aboutit à une entrée (29) de liquide dans la structure.
Abstract:
본 발명은 다이사이클로펜타다이엔의 순도가 적어도 92%인 다이사이클로펜타다이엔 프리폴리머 제제를 이용한 압력 용기의 컴포넌트의 제조 방법 및 이러한 방법에 의해 제조된 압력 용기에 관한 것으로서, 프리폴리머 제제는 주변 온도에서 프리폴리머 제제를 유동성으로 만드는 반응성 에틸렌 모노머를 더 포함한다.
Abstract:
이재 조인트(50)가, 복수개의 조인트 세그먼트(44)를 길이 방향으로 연속 설치하여 형성된다. 조인트 세그먼트(44)는, 제1 부재(51), 중간 부재(55), 및 제2 부재(54)가 폭발 압접에 의해 접합되어 일체화된 것이다. 조인트 세그먼트(44)의 다른 세그먼트(44)와 접합되는 접합 단면에는, 제1 부재(51)의 단면과 제2 부재(54)의 단면을 적층 방향으로 공간적으로 떼어놓는 홈(62)이 형성되어 있다. 이재 조인트(50)의 인접하는 세그먼트(44,44)들은, 제1 부재(51)의 단면끼리가 용접에 의해 접합되고, 제2 부재(54)의 단면끼리가 용접에 의해 접합되어 있다.