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首页> 外文期刊>Aerospace science and technology >Premixing-type liquefied gas bipropellant thruster using nitrous oxide/dimethyl ether
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Premixing-type liquefied gas bipropellant thruster using nitrous oxide/dimethyl ether

机译：一氧化二氮/二甲醚的预混合式液化气双推进剂推进器

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This paper describes a nitrous oxide (N2O)/dimethyl ether (DME)-based bipropellant thruster in which the propellant gases are premixed before they enter the thrust chamber. Monopropellant (hydrazine) and bipropellant (nitrogen tetroxide (NTO)/hydrazine) thrusters are used in the onboard propulsion systems on a spacecraft and exhibit high performance. However, hydrazine and NTO are strongly toxic and exhibit high reactivity with respect to various materials. Further, their relatively high freezing points and low vapor pressures make it necessary to use heaters for the storage tanks and tubes and the pressurant feed systems. Hence, we propose an N2O/DME liquefied gas bipropellant thruster. The bipropellant is less toxic compared to hydrazine/NTO and has an adequate vapor pressure and low freezing point, which makes complex temperature management systems unnecessary. We tested a 0.4-N class prototype wherein N2O and DME were made to flow directly into the thrust chamber. The prototype exhibited a low characteristic velocity (C*) efficiency at 60%. Hence, a prototype with a propellant mixer was designed to enhance the C* efficiency and reduce the size of the thrust chamber. A coil-type mixer was developed to mix the fuel and oxidizer based on the secondary flow induced in curved tubes. Thrust measurements showed that this premixing-type prototype had a C* efficiency of 84.5% at an O/F ratio of 3.5. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：本文介绍了一种基于一氧化二氮（N2O）/二甲醚（DME）的双推进剂推进器，其中推进剂气体在进入推力室之前已进行预混合。单推进剂（肼）和双推进剂（四氧化氮（NTO）/肼）推进器用于航天器的机载推进系统中，并具有高性能。然而，肼和NTO具有强毒性，并且相对于各种材料表现出高反应性。此外，它们相对较高的凝固点和低蒸气压使得必须将加热器用于储罐和管道以及增压剂供给系统。因此，我们提出了一种N2O / DME液化气双推进剂推进器。与肼/ NTO相比，双推进剂的毒性较小，并且蒸气压足够低且凝固点较低，因此不需要复杂的温度管理系统。我们测试了0.4-N级的原型，其中使N2O和DME直接流入推力室。该原型显示出60％的低特征速度（C *）效率。因此，设计了带有推进剂混合器的原型，以提高C *效率并减小推力室的尺寸。开发了一种盘管式混合器，根据弯管中产生的二次流将燃料和氧化剂混合。推力测量表明，该预混合型原型在O / F比为3.5时的C *效率为84.5％。 （C）2019 Elsevier Masson SAS。版权所有。

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