|Table of Contents|

Numerical study on liquid-gas emulsification process and flow uniformity in gas generator injector(PDF)

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

Issue:
2024年03期
Page:
108-117
Research Field:
目次
Publishing date:

Info

Title:
Numerical study on liquid-gas emulsification process and flow uniformity in gas generator injector
Author(s):
SUN Jingyang1; 2;  MAO Hongwei1; 3;  MA Yuan4;  LI Yanzhong4
1.National Key Laboratory of Aerospace Power System and Plasma Technology, Xi'an Jiaotong University,Xi'an 710049, China; 2. School of Future Technology, Xi'an Jiaotong University, Xi'an 710149, China; 3. School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710149, China; 4. School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710149, China
Keywords:
gas emulsification;  gas generator;  liquid-gas flow;  fitted laws of pressure drop
PACS:
TK49
DOI:
10.3969/j.issn.1672-9374.2024.03.012
Abstract:
The gas and emulsification technology can significantly increase the pressure drop when the fuel flows through the gas generator, so the atomization and combustion requirements of the fuel can be satisfied under variable working conditions. However, there is still a lack of quantitative research on the changing law of pressure drop in the process. In this paper, the CFD(Computational Fluid Dynamics)method was used to calculate the whole field and local nozzles of a certain type of gas generator under variable working conditions, the phase, velocity and pressure distribution laws of kerosene in the gas generator during the nitrogen blowing process were obtained. The flow and multiphase flow pressure drop characteristics were fitted and analyzed. The results show that the distribution of kerosene phase at different nozzles is not uniform, and the flow rate difference between nozzles can be up to 66%; the pressure drop at the nozzles after nitrogen blowing can be improved by more than 1.64 times compared with the single-phase flow of kerosene; the pressure drop resistance coefficient of the gas single-phase flow at the nozzle shows a linear change with the back pressure, while the kerosene single-phase flow pressure drop resistance coefficient shows an exponential law with the flow rate. The mathematical model of the pressure drop characteristics at the gas generator nozzle based on the Marchinelli formula has an average error of 3.93% with the numerical calculation results, which has good predictability.

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