Performance analysis of an expansion-deflection (E-D) nozzle based on pintle inflection angle

In expansion-deflection (E-D) nozzles, an open wake or a closed wake developed depends on the nozzle pressure ratio, and this can be used for altitude compensation nozzle of space launch vehicles. In this paper, experiments were performed to analyze the performance of E-D nozzles with different pint...

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Bibliographic Details
Published inJournal of mechanical science and technology Vol. 36; no. 12; pp. 6065 - 6072
Main Authors Choi, Junsub, Huh, Hwanil
Format Journal Article
LanguageEnglish
Published Seoul Korean Society of Mechanical Engineers 01.12.2022
Springer Nature B.V
Subjects
Control
Deflection
Dynamical Systems
Elastic waves
Engineering
Industrial and Production Engineering
Mechanical Engineering
Nozzle walls
Nozzles
Original Article
Pressure ratio
Shock waves
Structural stability
Thrust measurement
Vibration
Wall pressure
Pintle inflection angle
Expansion-deflection nozzle
Nozzle pressure ratio
Open wake
Closed wake
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Summary:In expansion-deflection (E-D) nozzles, an open wake or a closed wake developed depends on the nozzle pressure ratio, and this can be used for altitude compensation nozzle of space launch vehicles. In this paper, experiments were performed to analyze the performance of E-D nozzles with different pintle inflection angles according to nozzle pressure ratio. Identical experimental E-D nozzles were manufactured, changing only the pintle inflection angle, which directly affected thrust performance, as a variable, and thrust and nozzle wall pressure were measured. To improve the reliability of the thrust measurement, the thrust measurement system was calibrated, and the uncertainty was evaluated and verified. Results of the experiment revealed that when the inflection angle of the E-D pintle increased, thrust decreased due to the decrease in the nozzle throat area. In the open wake, shock waves and expansion waves were repeatedly generated, resulting in a section where pressure increased on the nozzle wall. Nozzle pressure measurements confirmed the non-uniform separation of the flow from the nozzle wall surface. Studying the nozzle side load further is necessary because this phenomenon affects the structural stability of the nozzle.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-022-1121-7