Electrode ignition and control of electrically operated propellants

    公开(公告)号:US10145337B2

    公开(公告)日:2018-12-04

    申请号:US15197421

    申请日:2016-06-29

    Abstract: Electrical ignition of electrically operated propellant in a gas generation system provides an ignition condition at an ignition surface between a pair of electrodes that satisfies three criteria of a current density J that exhibits a decreasing gradient along an axis normal to an ignition surface, is substantially constant across the ignition surface and exceeds an ignition threshold at the ignition surface. These criteria may be satisfied by one or more of an angled electrode configuration, a segmented electrode configuration or an additive to the electrically operated propellant that modifies its conductivity. These configurations improve burn rate control and consumption of the available propellant and are scalable to greater propellant mass to support larger gas generation systems.

    Base drag reduction fairing using shape memory materials

    公开(公告)号:US10184762B2

    公开(公告)日:2019-01-22

    申请号:US14956169

    申请日:2015-12-01

    Abstract: A device is provided. The device includes at least one SMM component fabricated from an SMM. The SMM component is configured to change shape in response to receiving a stimulus. The SMM component is also configured to deploy from a device body of the device allowing the device to change shape in an advantageous way. A method implemented by a device is also provided. The method includes changing a shape of an SMM component of the device in response to receiving a stimulus. The SMM component is fabricated from an SMM. The method also includes deploying the SMM component from a device body of the device allowing the device to change shape in an advantageous way.

    Slotted multi-nozzle grid with integrated cooling channels
    10.
    发明授权
    Slotted multi-nozzle grid with integrated cooling channels 有权
    带有集成冷却通道的开槽多喷嘴格栅

    公开(公告)号:US09115666B2

    公开(公告)日:2015-08-25

    申请号:US13647599

    申请日:2012-10-09

    CPC classification number: F02K9/30 F02K9/97 F02K9/972 Y10T29/49346

    Abstract: An apparatus includes a slotted multi-nozzle grid with a plate having multiple elongated slotlettes through the plate. Each of at least some of the slotlettes has a convergent input, a divergent output, and a narrower throat portion separating the convergent input and the divergent output. At least some of the slotlettes are arranged in multiple rows. The plate further includes multiple cooling channels through the plate. At least some of the cooling channels are located between the rows of slotlettes. Each cooling channel is configured to transport coolant through the plate in order to cool the plate, such as to cool the plate as hot combustion gases pass through the plate. Each of at least some of the rows may include at least two slotlettes, and two adjacent slotlettes in one row may be separated by a structural ligament (which may have a tear-drop cross-sectional shape).

    Abstract translation: 一种装置包括带槽的多喷嘴格栅,其具有穿过该板的具有多个细长槽的板。 至少一些小缝隙中的每一个具有收敛输入,发散输出和分离收敛输入和发散输出的较窄喉部。 至少一些小行星排列成多行。 板还包括穿过板的多个冷却通道。 至少一些冷却通道位于行槽之间。 每个冷却通道被构造成运输冷却剂通过板以便冷却板,例如当热燃气通过板时冷却板。 至少一些行中的每一行可以包括至少两个开槽元件,并且一行中的两个相邻的开槽元件可以被结构韧带(其可能具有泪滴横截面形状)分开。

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