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The Effects Of Placement Of Acoustic Dampers On Combustion Instabilit1.edited

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Literature Review
The Effects of Placement of Acoustic Dampers on Combustion Instability
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Introduction
Instability in combustion is a problem that has faced combustor designers since the development
of jet engines [1]. Combustion instability is a critical challenge in the modern engineering world
where the development of complex and advanced combustion systems are needed to provide
higher performance, energy consumption efficiency and mode of energy release. The overall goal
of combustor designers is achieving high-energy consumption efficiency, high performance, and
release low levels of emissions [4]. Additionally, combustion instability is usually discovered
during the late stages of its development cycle requiring empirical development tests that are
expensive and time-consuming, which affects its overall performance. Though there has been a
significant success in understanding combustion instability mechanisms, there are no definite
means or tools for predicting and avoiding combustion instability [3]. The complexity in enhancing
stability in combustion is due to complexity, strong nonlinearities, and highly interactive
combustion instabilities nature [4]. All these factors make relatively minor features to have a
significant impact on overall combustion behaviour of the combustor. The current literature review
section will address combustion instability interventions, especially using acoustic dampers.
Stabilization of Combustion Using Acoustic Dampers
The combustion systems like aero-engines and rocket motors are exposed to acoustic changes in
pressure during their normal operations, under normal and table engine system operation [1]. The
changes in pressure occur randomly without a definite path of difference with the corresponding
frequency spectrum takes a continuous path naturally. Under unstable operating conditions, there
is a high concentration of the acoustical energy that appears in the form of some frequencies that
resemble combustor resonance in a spectrum. Both harmonics and non-harmonics (easily
recognised peaks) take a different spectrum with the production of random noise [7]. Combustion
instability, technically regarded as large amplitude self-sustained pressure fluctuations expose the
engine to catastrophic failure or damage [12]. Therefore, combustor designers prerequisites a
stable engine operation. This occurs despite the practical assessment that no engine can be
inherently perfect instability [2].
Engine stability is influenced by several factors including engine configuration, operating
conditions, injector, and thrust chamber [3]. Therefore, it is critical to evaluate the issue that
mitigates the self-sustained fluctuation in pressure of the combustor, which significantly influences

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1 Literature Review The Effects of Placement of Acoustic Dampers on Combustion Instability Name of Student Professor University Date of Submission 2 Introduction Instability in combustion is a problem that has faced combustor designers since the development of jet engines [1]. Combustion instability is a critical challenge in the modern engineering world where the development of complex and advanced combustion systems are needed to provide higher performance, energy consumption efficiency and mode of energy release. The overall goal of combustor designers is achieving high-energy consumption efficiency, high performance, and release low levels of emissions [4]. Additionally, combustion instability is usually discovered during the late stages of its development cycle requiring empirical development tests that are expensive and time-consuming, which affects its overall performance. Though there has been a significant success in understanding combustion instability mechanisms, there are no definite means or tools for predicting and avoiding combustion instability [3]. The complexity in enhancing stability in combustion is due to complexity, strong nonlinearities, and highly interactive combustion instabilities nature [4]. All these factors make relatively minor features to have a significant impact on overall combustion behaviour of the combustor. The current literature review section will address combustion instability interventions, especially using acoustic dampers. Sta ...
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