|Table of Contents|

Simulation on spray combustion flow field of the air heater(PDF)

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

Issue:
2023年05期
Page:
13-22
Research Field:
目次
Publishing date:

Info

Title:
Simulation on spray combustion flow field of the air heater
Author(s):
FAN Bo;  SHEN Chibing;  WANG Ke
(Hypersonic Technology Laboratory, National University of Defense Technology, Changsha 410073, China)
Keywords:
air combustor;  spary combustion;  flame stability;  injection pressure drop;  DPM
PACS:
V411.7
DOI:
-
Abstract:
In order to study the influence of injection pressure drop on the spray combustion flow field and combustion stability of the air heater. Discrete phase model(DPM)and eddy dissipation model considering the turbulent combustion effect were used to simulate the C2H5OH/LOx/Air tripropellant air heater, the simulation results were in good agreement with theoretical calculation and experiment, thereby the accuracy of the numerical models was verified. As the results shown, under the condition of maintaining a constant mass flow of the three-component propellant, increasing the air injection pressure drop could shorten the alcohol spray atomization distance and flame length, when the air injection pressure drop is increased to the critical pressure, the spray distance is shortened by 50% and the flame length is shortened by 40%. And the temperature distribution in the combustion chamber was more uniform, which could provide a uniform hot air flow to meet the test needs; reducing the alcohol injection pressure drop could reduce the alcohol spray penetration distance, and the flame was more concentrated on the axis of the combustion chamber. In addition, when the air injection pressure drop exceeded the working range, the flame would not be anchored to the injector outlet, which could cause the heater to shut down. Excessively high alcohol injection pressure drop would cause the combustion flame to oscillate periodically, which was not conducive to the thermal protection of the combustion chamber.

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