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Single-valve opening pulse characteristics of a 150 N hypergolic bipropellant liquid rocket engine(PDF)

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

Issue:
2023年06期
Page:
10-20
Research Field:
目次
Publishing date:

Info

Title:
Single-valve opening pulse characteristics of a 150 N hypergolic bipropellant liquid rocket engine
Author(s):
CHEN Ruida1; 2;  WANG Heming1; 2;  XU Hui1; 2;  CHEN Hongyu1; 2; XUAN Xiaoping1; 2
1.Shanghai Institute of Space Propulsion, Shanghai 201112, China; 2.Shanghai Engineering Research Center of Space Engine, Shanghai 201112, China
Keywords:
space liquid rocket engine;  hypergolic propellant;  single-way solenoid valve;  pulse characteristic;  thrust impulse;  flash vaporization
PACS:
V434.3
DOI:
-
Abstract:
In order to study the effect of single solenoid valve opening on the pulse operating characteristics of the bipropellant space liquid rocket engine using hypergolic propellants, the high-altitude simulated thermal test of a 150 N engine was carried out with the propellant combination of dinitrogen tetroxide and methyl-hydrazine.The pulse operating characteristics of the engine were investigated at 20 ms, 30 ms, 50 ms, and 80 ms pulse widths with both the oxidizer and fuel path solenoid valves open at the same time and separately, and the pulse control period was 160 ms.The test results show that the average thrust impulses of the engine at 20 ms and 30 ms pulse widths are 0.35 N·s and 0.41 N·s when only the oxygen control valve is opened, which are 11.08 and 9.51 of the corresponding normal operating conditions.The average thrust impulses at 50 ms and 80 ms pulse widths are 0.47 N·s and 0.63 N·s, which are 6.20 and 5.33 of the corresponding normal operating conditions.The dinitrogen tetroxide undergoes violent flash vaporization.When the fuel control valve is opened only, the average thrust impulses of the engine at 20 ms and 30 ms pulse widths are 0.17 N·s and 0.18 N·s, which are 5.38 and 4.18 of the corresponding normal operating conditions, and the methyl-hydrazine flows out from the nozzle outlet edge in liquid state.When the pulse widths increase to 50 ms and 80 ms, the incomplete flash vaporization of methyl-hydrazine occurs, and the average thrust impulse of the engine gradually increases with the increase of pulse width.The average thrust impulses of the engine are 0.22 N·s and 0.31 N·s, which are 2.90 and 2.62 of the corresponding normal operating conditions.The thrust impulse generated by the engine pulse operation when the single control valve is opened is mainly related to the degree of propellant flash vaporization.

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