|Table of Contents|

Effect of radial slots layout on spray angle for gas-liquid pintle injector(PDF)

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

Issue:
2023年06期
Page:
1-9
Research Field:
目次
Publishing date:

Info

Title:
Effect of radial slots layout on spray angle for gas-liquid pintle injector
Author(s):
ZHANG Botao1;  WANG Kai1;  LI Ping2;  YANG Anlong1
1. Key Laboratory for Liquid Rocket Engine Technology, Xi'an Aerospace Propulsion Institute,Xi'an 710100, China; 2.Academy of Aerospace Propulsion Technology, Xi'an 710100, China
Keywords:
gas-liquid pintle injector;  spray angle;  radial slot;  blocking rate
PACS:
V434.3
DOI:
-
Abstract:
In present, the injection form of the center propellant in pintle injector is mostly discrete slot, and radial slots layout plays a decisive role in the spray structure. In order to obtain the spray angle formula of gas-liquid pintle injectors, a spray angle prediction formula of injector unit was deduced from the momentum conservation based on the control volume. The momentum coefficient was derived from the experimental results to modify the theoretical formula. For the spray angle of pintle multi-injectors, the experimental results were used to modify the theoretical model of injector unit spray angle and the effect of radial slots layout and blocking rate on spray angle was mastered. The results show that the theoretical value of spray angle is in good agreement with the experimental value. Under the constant total injection area and mass flow rate, the radial slots layout has little effect on the spray angle. The spray angle is determined by the local momentum ratio and blocking rate. Whenblocking rate is not more than14.55, the interaction between adjacent injection units is minimal, and the spray angle of gas-liquid pintle multi-injectors is approximate to the spray angle of gas-liquid pintle injector unit. Whenblocking rate is not less than25.46, the recommended value of momentum coefficient in the theoretical formula of spray angle is 0.87.

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