|Table of Contents|

Characteristics of final condensate products in solid rocket engine(PDF)

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

Issue:
2024年03期
Page:
90-101
Research Field:
目次
Publishing date:

Info

Title:
Characteristics of final condensate products in solid rocket engine
Author(s):
LIU Mengying1;  XU Chen'en1;  HUANG Hexia1;  CAI Jia1; 2;  LIU Zhu3;  LI Shipeng4
1.College of Energy and Power, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2.College of Aviation Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210023, China; 3.Science and Technology on Space Physics Laboratory, Beijing 100076, China; 4.School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100086, China
Keywords:
solid rocket motor;  aluminized composite propellant;  condensate products;  particle size distribution;  dynamic particle size measurement
PACS:
V512
DOI:
10.3969/j.issn.1672-9374.2024.03.010
Abstract:
The addition of aluminium particles can effectively improve the energy characteristics of solid propellants, but it also brings negative effects such as specific impulse loss, slag deposition, and intensified nozzle erosion. Therefore, conducting research on the characteristics of final condensed phase products in solid rocket motors is of great significance for evaluating and improving the performance of solid rocket engines. The final condensate products were taken as the main research object, and a dynamic measurement system for high-temperature and high-speed particle characteristics based on particle size analyser was built for experimental research on AP/HTPB aluminized composite propellant under the real working condition of solid rocket engine. The distribution characteristics of final condensate products in the exhaust plume, including the change laws of the particle size, average particle size and types of final condensate products were revealed in this paper. It provides experimental and data support for comprehensively understanding the size distribution characteristics of condensed products. The working process of solid rocket engine can be divided into three stages(stages ①～③)according to the pressure distribution in the combustion chamber. In stage ①, The research shows that the condensate products in the exhaust plume include the combustion products of powder explosive and propellant. The random combustion characteristics of powder explosive and the sudden rise of pressure in the combustion chamber will jointly affect the distribution characteristics of condensate products at this stage. The size distribution of condensate products has the highest stability in stage ②, and characteristic distribution can be applied to describe the size distribution of condensate products. The dispersion of size distribution of condensate products in stage ③ is smaller than that in stage ①, and a sudden drop of pressure in combustion chamber during this stage will affect the distribution characteristics of condensate products. Sudden changes in combustion chamber pressure and temperature can alter the distribution characteristics of condensate products modes, peak particle size, and mean particle size. Meanwhile, the mass fraction of different types of condensate products varies with the operating stage of the solid rocket engine.

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