University of Twente Student Theses


Measuring the acoustic properties of rocket engine faceplate configurations DLR-LA-HF-RP-086

Kurylek, R. (2017) Measuring the acoustic properties of rocket engine faceplate configurations DLR-LA-HF-RP-086.

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Abstract:The high-frequency combustion instability during an ignition process has a great influence on correct operation of combustion process and combustion chamber itself. This type of instabilities is considered to be the most destructive, and is usually characterized by well-defined frequencies and mode shapes corresponding to the acoustic modes of the chamber. Understanding and predicting acoustic instabilities in liquid propellant rocket engine requires the knowledge of the acoustic behavior of all the elements feeding the combustion chamber. Consequently, the motivation behind the present work is to gain further insight into key parameters associated with acoustic characteristic of the material components in broad frequency range. This data are crucial for implementation of boundary values in the simulation of combustion instabilities within rocket combustion chamber. Using these values we can achieve accurate simulation of combustion processes in rocket combustion chamber. The aim of this assignment is to develop an acoustic measurement tube with an improved working frequency range. The methodology employs set of fixed microphones that can be used quickly to measure the acoustic impedance of any material placed in the sample holder at the end of the tube, over a frequency band of 0.4 to 11.5 kHz. A repeatable model analysis method will be proposed in order to determine characteristic parameter. Then this will be investigated for multiple type of material specimens. Characteristic behavior will have to be found for a sintered bronze disk material, rigimesh wire plate and foam. A proof-of-concept study towards the boundary conditions to simulate acoustic behavior at the surface of object is performed, with an ultimate goal of improvement of impedance tube procedure. The development of measurement procedure as well as experimental validation have been performed and presented in this report.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Keywords:Impedance tube, High frequency combustion instabilities, Liquid propellant rocket engine
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