|Table of Contents|

Effect of ambient pressureon the atomization characteristics of gas-liquid pintle injector (PDF)

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

Issue:
2023年03期
Page:
15-25
Research Field:
目次
Publishing date:

Info

Title:
Effect of ambient pressureon the atomization characteristics of gas-liquid pintle injector
Author(s):
XIE Yuan;  NIE Wansheng;  GAO Yuchao;  SU Lingyu;  TONG Yiheng
(Department of Astronautical Science and Technology, Aerospace Engineering University, Beijing 101416, China)
Keywords:
gas-liquid pintle injector;  ambient pressure;  spray cone angle;  reflux zone;  droplets size
PACS:
V434
DOI:
-
Abstract:
Gas-liquid pintle injector has important application in variable thrust liquid rocket. In order to study the influence of ambient pressure on the atomization characteristics of gas-liquid pintle injector, the atomization characteristics of the injector under different ambient pressures, such as the liquid film breaking process, spray cone angle, reflux zone distribution, pressure distribution and droplet size, were systematically studied by experiments and numerical computation. Three factors affecting liquid film breakage were revealed:airflow impact, ambient gas density and the effect of ambient pressure on liquid film extrusion. The results show that the spray cone angle increases with the increase of ambient pressure, but the increasing trend of spray cone angle decreases gradually. The overall shape of the spray is conical, and there is a low-pressure reflux area in the center of the spray. The number of droplets in the reflux area is small, but the particle size of droplets is relatively uniform. The droplets are mainly distributed on the gas-liquid interaction surface, and the particle size of the droplets downstream is larger, while the particle size of the droplets outside is larger than that of the droplets inside. At the moment when liquid rocket starts, the combustor pressure changes dramatically, which may lead to a large change in spray cone angle, resulting in uneven spatial distribution of propellant and affecting combustion performance. Therefore, it is necessary to avoid or reduce the design pressure interval of combustor with poor atomization.

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