|Table of Contents|

Experiment of gas injection atomization characteristics of long swirl cavity open-end centrifugal nozzle(PDF)

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

Issue:
2024年03期
Page:
28-41
Research Field:
目次
Publishing date:

Info

Title:
Experiment of gas injection atomization characteristics of long swirl cavity open-end centrifugal nozzle
Author(s):
PENG Leqin;  WU Huibo;  XU Tiangang;  YANG Anlong;  YANG Bao'e
National Key Laboratory of Aerospace Liquid Propulsion,Xi'an Aerospace Propulsion Institute, Xi'an 710100, China
Keywords:
centrifugal nozzle;  long swirl cavity;  gas injection atomization;  breakage morphology;  gas-liquid two-phase pressure building;  atomization particle size
PACS:
V434.3
DOI:
10.3969/j.issn.1672-9374.2024.03.004
Abstract:
Using water and kerosene as working fluids and nitrogen and helium as injection gases, the atomization characteristics of the long swirl cavity open-end centrifugal nozzle were experimentally studied under different gas flow rates. The study included analyzing the breakage morphology of the injection liquid film, the pressure of gas-liquid two-phase mixing, and the atomization particle size. The results show that as the gas-liquid mass flow ratio increases, the breakage mode gradually shifts from flange-type breakage and porous-type breakage to burst-type breakage. Additionally, the impact length of central airflow increases, while the impact frequency of airflow does not follow a linear pattern with the change in gas-liquid mass flow ratio. When the gas flow ratio is high or low, the frequency of airflow impact increases. Compared with nitrogen gas, helium gas has a faster pressure-building speed and higher pressure-building value. However, the pressure fluctuation in the mixing chamber is more violent during the pressure building process for the cases of helium gas. The particle size of the cases using helium gas are generally smaller than that of nitrogen gas with the same gas pressure. However, when the flow rate of helium gas is too high, it can cause airflow impact, leading to uneven distribution of atomized particle sizes.

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