Abstract

Abstract The stability behavior of a virtual thrust chamber demonstrator with low injection pressure loss is studied numerically. The approach relies on an eigenvalue analysis of the Linearized Euler Equations. An updated form of the stability prediction procedure is outlined, addressing mean flow and flame response calculations. The acoustics of the isolated oxidizer dome are discussed as well as the complete system incorporating dome and combustion chamber. The coupling between both components is realized via a scattering matrix representing the injectors. A flame transfer function is applied to determine the damping rates. Thereby it is found that the procedure for the extraction of the flame transfer function from the CFD solution has a significant impact on the stability predictions.

Highlights

  • High frequency combustion instabilities, i.e. the mutual amplification of acoustic oscillations and heat release fluctuations, are a recurring issue in rocket engine development

  • Several thrust chamber demonstrators (TCDs) featuring key elements of generation rocket engines have been proposed by ArianeGroup [5]

  • Demonstrator TCD2 is designed with a low pressure loss between the oxidizer dome and the combustion chamber

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Summary

Introduction

I.e. the mutual amplification of acoustic oscillations and heat release fluctuations, are a recurring issue in rocket engine development. Demonstrator TCD2 is designed with a low pressure loss between the oxidizer dome and the combustion chamber. While this reduces the power demands of the turbopumps, it increases the risk of acoustic coupling between chamber and injection system. This approach is used to analyze the TCD2 design regarding its thermoacoustic stability. The pure first transverse mode (T1) has been found to possess the lowest damping capability of the modes of first transverse order It has been selected for further investigation in the present study. Thereby the focus lies on the dynamics of the oxidizer dome and the influence of the flame response on the chamber stability. The acoustics of the isolated dome are studied before the coupled system as well as the impact of the flame response are discussed

Test Case
Stability Assessment Procedure
Perturbation Analysis
Mean Flow
Flame Response
External Components and Design Adaption
Numerical Setup
Eigensolution Study
Single Flame
Results
Dome Acoustics
Coupled Acoustics
Stability Behavior
Conclusions
Full Text
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