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Ion Current Based Pressure Sensor for Pulse Detonation Engines

Author: GuoWei
Tutor: HuangJinQuan
School: Nanjing University of Aeronautics and Astronautics
Course: Aeronautical and Astronautical Science and Technology
Keywords: Pulse Detonation Engine Ion current Pressure sensor Ion microprobe. Data processing and analysis
CLC: V235.22
Type: Master's thesis
Year: 2007
Downloads: 100
Quote: 0
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Abstract


The detonation engine combustion chamber pressure is an important physical quantities to control successfully knock , The transient pressure not only can determine the ignition timing and ignition delay time , but also related to the operating frequency of the pulse detonation engine efficiency . Due to the the detonation engine 's condition is very bad , so the traditional piezoelectric pressure sensor is no longer applicable , and therefore an urgent need to study an alternative method of pressure measurement . This study is based on the ion current of the mechanism of high - temperature pressure sensor , the design of the two types of ion probe , and a series of round robin Knock test , analysis of the relationship between the ion current and the pressure in the knocking process . Test respectively from the ion probe length, the bias pressure, chemical proper ratio and probe position four aspects of the change of the ion current , and is designed on the basis of the two types of ion probe a single-needle short probes . ion current sensor. The sensor measured the ion current signal waveform and pressure signals , good linearity , can be used to measure the distance of the detonation wave in a single cycle detonation process speed and deflagration to detonation transition . Fitting method to establish an ion current decay is a linear relationship of the velocity and pressure , through the analysis of a plurality of groups of measurement data , confirmed the correctness of the theoretical derivation . This pulse detonation engine pressure measurements provide a feasible method to determine the pressure , that is, by measuring the ion current signal detonation process , laying the foundation for the the detonation engine controller design .

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CLC: > Aviation, aerospace > Aviation > Aero-engine ( propulsion system ) > Air jet engine > Compressor engine > Pulse jet engine
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