|Table of Contents|

Simulation analysis on the influence of flow pulsation on the atomization characteristics of a pintle injector(PDF)

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

Issue:
2023年01期
Page:
54-64
Research Field:
目次
Publishing date:

Info

Title:
Simulation analysis on the influence of flow pulsation on the atomization characteristics of a pintle injector
Author(s):
XIE Yuan;  NIE Wansheng;  GAO Yuchao;  TONG Yiheng
(Department of Aerospace Science and Technology, Aerospace Engineering University, Beijing 101416, China)
Keywords:
gas-liquid pintle injector VOF DPM numerical simulation liquid mass pulsation atomization characteristics
PACS:
V434
DOI:
-
Abstract:
Pintle injectors have important application in variable thrust liquid rockets.The continuous phase to discrete phase method and adaptive algorithm based on tree data structure were used to study the atomization and crushing process of a gas-liquid pintle injector, with emphasis on the effect of liquid flow pulsation.The atomization process under upstream flow pulsation was simulated by applying periodically varying mass flow inlet boundary, and the atomization characteristics with or without flow pulsation were compared.The influence of pulsation frequency on the atomization of the pintle injector was studied.The results show that when the liquid mass flow was constant, the long liquid filaments are separated from the liquid film under the impact of gas flow, and the long liquid filaments are broken into small liquid filaments and a large number of droplets.The broken distance is long, and the liquid film breaking process is orderly.When the flow pulsation amplitude was 0.15 and the pulsation frequency ranges from 500 Hz to 3 000 Hz, the crushing distance is shortened, the liquid film forms an obvious annular surface wave, and droplets gather around the annular liquid filament after crushing, and the atomization cone angle is less affected by the pulsation frequency.Pulsation frequencies significantly reduce droplet sizes, and at high frequencies(3 000 Hz), a small number of large droplet may be produced.The liquid flow fluctuation makes the droplet distribution appear local aggregation phenomenon, and the spray shape appears obvious “bulge” structure.

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