|Table of Contents|

Effect of gas injection angle on combustion efficiency of secondary combustion chamber for solid rocket scramjet containing boron(PDF)

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

Issue:
2022年01期
Page:
69-75
Research Field:
研究与设计
Publishing date:

Info

Title:
Effect of gas injection angle on combustion efficiency of secondary combustion chamber for solid rocket scramjet containing boron
Author(s):
LING Jiang1; XU Yihua1; SUN Haijun1; FENG Xiping2
(1.Jiangxi Key Laboratory of Micro Aero Engine, School of Aircraft Engineering, Nanchang Aeronautical University, Nanchang 330063, China; 2.Key Laboratory of Combustion, Thermal Structure and Internal Flow Field,Northwestern Polytechnical University, Xi’a
Keywords:
aerospace propulsion system;  boron powder;  solid rocket;  scramjet;  secondary combustion of two-phase flow
PACS:
V236
DOI:
-
Abstract:
Solid rocket gas-fired scramjet has the advantages of high specific impulse,simple structure and easy flow adjustment. However,in the secondary combustion chamber with supersonic air flow,how to make the fuel mixed with air better,increase the residence time of gas and particles,and release more combustion enthalpy in a short time has become the focus of current research. Based on King’s ignition and combustion model of boron particles,realiable k-ε turbulence model and single-step vortex dissipation model are adopted in this paper,and the aerodynamic stripping effect of boron particles in high-speed airflow is considered. The Runge Kutta algorithm is used to iteratively calculate the ignition and combustion process of boron particles. The three-dimensional two-phase combustion flow in the secondary combustion chamber under 10 intake modes with the angle between gas inlet direction and axial direction from 45° to 180° is calculated. In addition,the gas combustion efficiency under various intake angles,the combustion efficiency of boron particles and the overall combustion efficiency are analyzed. The results show that when the angle between the injection angle of primary gas and the axial angle increases gradually,the combustion efficiency of fuel gas and particles increases gradually,and the combustion efficiency and the specific impulse reach the highest at 180°.

References:

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