|Table of Contents|

Comparative study on atomization characteristics between 3D printing and machined injectors(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年01期
Page:
35-43
Research Field:
研究与设计
Publishing date:

Info

Title:
Comparative study on atomization characteristics between 3D printing and machined injectors
Author(s):
XIAO Li 1; 2;  BAI Xiao1; 2;  LI Qinglian 1; 2;  SHENG Liyong 1; 2
(1.College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China; 2.Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China)
Keywords:
3D printing;  machining technology;  tri-propellant injector;  spray characteristics
PACS:
V435文献标识码:A 文章编号:1672-9374(2020)01-0035-09
DOI:
-
Abstract:
In order to clarify whether 3D printing technology can be applied to machine the injector which is a critical component of the rocket engine, and how the processing method affects the flow and atomization characteristics, the cold spray experiments were conducted using the 3D printing and machined injectors with the same structure. A back-lighting photography technique has been employed to capture the instantaneous spray images with a high speed camera. The droplet size distribution was measured using Malvern based on the laser scattering technique. The results show that the coaxiality and repeatability of the machined injectors is generally poor, and the spray has the problem of uneven spatial distribution such as deflection and dispersion. While for the 3D printing injectors, the discharge coefficient is lower than the designed value by 3% due to its higher roughness. On the premise of the better injector coaxiality, the processing method has less influence on the spray angle and diameter.

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Last Update: 2020-02-25