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

Issue:

2021年01期

Page:

29-35

Research Field:

研究与设计

Publishing date:

Info

Title:

Numerical study on overexpansion optimization of pulse detonation engine with fluidic nozzle

Author(s):

QIU Hua¹; HE Youquan²; MEN Kai¹

(1. School of Power and Energy,Northwestern Polytechnical University, Xi'an 710072,China; 2.Shaanxi Province Aerospace and Astronautics Propulsion Research Institute LTD., Xi'an 710129,China)

Keywords:

pulse detonation engine;  fluidic nozzle;  single cycle;  numerical simulation;  propulsion performance

PACS:

V231.2

DOI:

-

Abstract:

During the operation of the pulse detonation engine, the pressure of the detonation chamber is in a strong unsteady state. The traditional non-adjustable exhaust nozzle and adjustable exhaust nozzle cannot meet the high-frequency and drastic changes of the pressure inthe detonation chamber, which leads to greater thrust loss. In order to improve the performance of the current fixed-geometry nozzle for the pulse detonation engine,the detonation products extracted from the detonation chamber and named as secondary flow, can be injected into the divergent section of the nozzle by the valveless adaptive control. This is the fluidic nozzle whose effective divergent area ratio can be constantly changed by the secondary flow. Aimed to this type of fluidic nozzle, the flow field in the nozzle and the single-cycle pulse detonation engine influenced by the different injection conditions(such as injection area ratio, position ratio)of the secondary flow were investigated under 2-D numerical simulation while the initial pressure was 1atm, equivalence ratio was 1.0 and the amount of the explosive mixture was fixed. It can be found that the injection of the secondary flow can change the effective flow area of the nozzle, and the larger the injection area ratio of the secondary flow in the divergentsection of the nozzle, the higher the impulse rate of the nozzle is(the maximum increase rate is 5.25% relative to the reference nozzle). Also, the closer the injection position is located to the nozzle throat, the higher the impulse increase rate of the nozzle is.

References:

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Memo

Memo:

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Common functions

Last Update: 2021-02-20