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CN-121993373-A - Integrated electrospray thruster emission module based on 3D printing technology

CN121993373ACN 121993373 ACN121993373 ACN 121993373ACN-121993373-A

Abstract

An integrated electrospray thruster emission module based on a 3D printing technology belongs to the technical field of aerospace. The integrated electrospray thruster emission module is an integrated component integrally formed by a micro three-dimensional photoetching 3D printing technology, a continuous fluid transmission passage from a bottom fluid supply interface to a top emission nozzle is arranged in the integrated electrospray thruster emission module, and the integrated electrospray thruster emission module sequentially comprises a fluid supply interface layer, a multilayer flow channel structure and an emission layer from bottom to top according to the fluid flow direction. The invention realizes the integrated formation and high integration of the complex micro-channel structure, improves the uniformity of liquid supply of the array through the bifurcation micro-channel structure, reduces the size of the sprayed liquid drops and the single-hole flow, thereby realizing the miniaturization of the emitter and improving the integral emission performance and the working stability of the electrospray thruster.

Inventors

  • CHEN CHONG
  • Dong ziyang

Assignees

  • 大连理工大学

Dates

Publication Date
20260508
Application Date
20260320

Claims (7)

  1. 1. The integrated electrospray thruster emission module based on the 3D printing technology is characterized by being an integrated component integrally formed by a micro three-dimensional photoetching 3D printing technology, wherein a continuous fluid transmission passage from a bottom end liquid supply interface to a top end emission nozzle is arranged in the integrated electrospray thruster emission module; the emission layer (1) is positioned at the top end of the emission module of the integrated electrospray thruster, and comprises emission units which are arranged in the central area of the top surface and are uniformly distributed according to an array, wherein each emission unit comprises a concave emission protection hole (8) and an emission nozzle (10) which is arranged in the center of the bottom surface of the emission protection hole (8) and extends upwards; The multi-layer flow passage structure is arranged in the launching module of the integrated electrospray thruster and sequentially comprises a bifurcation flow passage layer (3) and a hydraulic resistance layer (2) from bottom to top along the launching axis direction, wherein the bifurcation flow passage layer (3) is used for carrying out hierarchical uniform distribution on working fluid entering a main flow passage (15), and the hydraulic resistance layer (2) is used for providing hydraulic resistance required by launching in each branch after distribution and realizing micro fluid supply; The liquid supply interface layer (7) is located at the bottom of the emission module of the integrated electrospray thruster, a circular interface counter bore (12) is arranged in the center of the liquid supply interface layer, a third connecting flow passage (6) is arranged in the center of the circular interface counter bore (12), the upper end of the third connecting flow passage (6) is communicated with the inlet of the main flow passage (15) of the bifurcation flow passage layer (3), and the lower end of the third connecting flow passage is used for the access of an external liquid supply pipeline.
  2. 2. The integrated electrospray thruster emission module based on the 3D printing technology according to claim 1, wherein the integrated electrospray thruster emission module is of a cuboid structure as a whole, and rounded corners (9) are arranged on four side edges in the thickness direction for transition.
  3. 3. The integrated electrospray thruster emission module based on the 3D printing technology according to claim 1, wherein the emission nozzle (10) has a conical truncated cone-shaped structure, and a first connecting flow channel (4) penetrating through the whole length is formed at the center of the emission nozzle along the direction of the emission axis and is used for communicating with the lower multilayer flow channel structure.
  4. 4. The integrated electrospray thruster emission module based on the 3D printing technology as claimed in claim 1, wherein the hydraulic resistance layer (2) is located below the emission layer (1) and comprises m high-resistance micro-channel units (14) which are identical in structure and are arranged independently, the m high-resistance micro-channel units (14) are symmetrically distributed in left and right rows, each high-resistance micro-channel unit (14) is further divided into 2n long Cheng Qushe branch channels which are independent of each other and identical in length, 2n parallel liquid outlets (16) are formed in each unit, 2n×m branch channels and liquid outlets (16) are formed in a total layer, the number of the branch channels and the liquid outlets (16) is identical to that of the emission units of the emission layer (1), and the liquid outlets (16) at the tail ends of the branch channels are combined to form a 2/m×4n array distribution and are correspondingly communicated with the emission nozzles (10) in the emission layer (1) through the first connecting channels (4).
  5. 5. The integrated electrospray thruster emission module based on the 3D printing technology according to claim 1, wherein the branching flow channel layer (3) is located below the hydraulic resistance layer (2), the branching flow channel layer (3) is formed into a hierarchical branching micro flow channel network with two symmetrical sides, and comprises a main flow channel (15) and multi-stage sub-channels formed by splitting the main flow channel (15) step by step to two sides, wherein the sub-channels at branching nodes of each stage are formed in pairs and symmetrically arranged about the central axis of the corresponding parent channel, the cross-sectional area of each sub-channel is set to be 1/2 of the cross-sectional area of the corresponding parent channel in each stage of branching, so that the total cross-sectional area of two sub-channels in the same stage of branching is consistent with that of the parent channel, and the last stage branching forms a final terminal channel which is respectively connected with the high-resistance micro channel unit (14) in the hydraulic resistance layer (2) through the second connecting flow channel (5) by repeating the symmetrical uniform cross-sectional area branching structure.
  6. 6. The integrated electrospray thruster emission module based on 3D printing technology according to claim 1, characterized in that the orifice edge of the circular interface counterbore (12) is provided with a chamfer (11).
  7. 7. The integrated electrospray thruster emission module based on the 3D printing technology according to claim 1, wherein the transition part of each runner is provided with a fillet transition structure (13) so as to reduce local flow resistance and abrupt flow field changes and improve the continuity and stability of fluid transmission.

Description

Integrated electrospray thruster emission module based on 3D printing technology Technical Field The invention relates to the technical field of aerospace, in particular to an integrated electrospray thruster emission module based on 3D printing, which realizes structural integration and miniaturization through integrated forming of microscale runners and improves emission performance. Background An electrospray thruster is a miniature electric thruster device which uses the action of a strong electric field to form a taylor cone on a conductive liquid or an ionic liquid at a spraying end and further generates charged liquid drops or an ion beam to obtain reaction thrust. The thruster has the advantages of compact structure, low power consumption, high specific impulse, capability of realizing micro-origanum milli-grade fine thrust adjustment and the like, and has wide application prospects in the fields of micro-nano satellite attitude control, orbit maintenance and the like. The existing electrospray thruster is generally composed of a liquid supply system, an emitter assembly, an electrode system, a packaging structure and the like. The ejector component is responsible for uniformly conveying working fluid to the micro-scale injection units and realizing stable injection under the action of a high electric field, and the structural design of the ejector component directly influences the injection stability, the thrust consistency and the overall performance of the thruster. However, the existing electrospray thruster emitter assembly mostly adopts a split structural design, and the micro-channel layer, the emission array layer and the liquid supply interface layer of the existing electrospray thruster emitter assembly are usually required to be assembled and integrated after being respectively processed, so that the manufacturing process is complex, the assembly precision requirement is high, and position deviation is easily introduced in the alignment process of a multilayer structure, thereby influencing the consistency and the stability of array injection. In addition, the split type structural design mode is limited by the machining precision of the traditional micro-machining process, the sizes of the emitter nozzle and the internal micro-scale runner are difficult to meet the actual application demands, excessive liquid supply and oversized emission liquid drop are easy to cause, and therefore the injection performance is reduced and the overall working effect of the thruster is influenced. Meanwhile, in the multi-nozzle array structure, the distribution uniformity of the working fluid among different emission units is difficult to ensure, and the phenomenon of uneven local flow or unstable injection is easy to occur, so that the consistency of the overall thrust output and the working reliability are reduced. Therefore, there is a need for an electrospray thruster emission module that can realize integrated formation of a complex micro-channel structure, improve the uniformity of liquid supply of an array, and combine the structural integration level and manufacturing feasibility. Disclosure of Invention Aiming at the problems that the existing electrospray thruster emission module component adopts a split type structure, is complex to manufacture and assemble, is difficult to meet application requirements due to the limitation of traditional processing technology, and is uneven in liquid supply, large in droplet size and flow, insufficient in injection stability and the like in a multi-nozzle array, the invention provides an integrated electrospray thruster emission module based on a 3D printing technology, which realizes the integrated formation and high integration of a complex micro-channel structure, improves the array liquid supply uniformity through a bifurcated micro-channel structure, reduces the jet droplet size and single-hole flow, thereby realizing the miniaturization of the emitter and improving the integral emission performance and the working stability of the electrospray thruster. The invention aims at realizing the following technical scheme: According to one aspect of the invention, an integrated electrospray thruster emission module based on a 3D printing technology is provided, the integrated electrospray thruster emission module is an integrated component integrally formed by a micro-stereolithography 3D printing technology, a continuous fluid transmission channel from a bottom end liquid supply interface to a top end emission nozzle is arranged in the integrated electrospray thruster emission module, and the integrated electrospray thruster emission module sequentially comprises a liquid supply interface layer 7, a multi-layer flow channel structure and an emission layer 1 from bottom to top according to the fluid flow direction. Further, the integral electrospray thruster emission module is of a cuboid structure, and four side edges in the thickness direction are provided w