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Numerical simulation of spray performance of coaxial swirling injector for N2O/C3H8 engine(PDF)

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

Issue:
2014年02期
Page:
36-43
Research Field:
研究与设计
Publishing date:

Info

Title:
Numerical simulation of spray performance of coaxial swirling injector for N2O/C3H8 engine
Author(s):
WANG Dong1; LIANG Guo-zhu2
1. Xi’an Aerospace Propulsion Institute, Xi’an 710100, China; 2. Beijing Univ. of Aeronautics and Astronautics, Beijing 100191, China
Keywords:
centrifugal injector;  nitrous oxide/propane engine;  spray performance study;  flow field simulation
PACS:
V434+.13-34
DOI:
-
Abstract:
Numerical computation method is conducted to investigate the spray performance of nitrous oxide/propane engine centrifugal injector. As a result, the impacts of gas injecting pressure drop and recessing distance on spray flow field of centrifugal injector were obtained. The result indicates that the lower gaseous phase injecting pressure drop (<0.3 MPa) affects the evaporation rates of propane droplet, gas flow flux, mixture ratio, and distribution of SMD and n significantly. As the gas injecting pressure increases from 0.3 MPa to 0.6 MPa, the values of SMD and n will change in the range of 2.41~1.68 and 2.03~0.98 respectively, and decrease gradually. As the recess depth of inner injector increases from 0 mm to 6 mm, the SMD and n values of droplet in the stable spray flow field will vary slightly, which fluctuate within 1.70~0.94 and 2.36~0.99 respectively. The best combustion zone of the injector distributes mostly in the downstream position of 0.015~0.035 m, and approaches to the injector outlet gradually along with the increase of gas pressure drop and recess depth. The injector has obtained a good effect in C3H8/N2O engine hot test.

References:

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