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Solid Rocket Ramjet Combustion Chamber Gas-particle Numerical Simulation Of Reacting Flow

Posted on:2008-05-26Degree:MasterType:Thesis
Country:ChinaCandidate:Z ChenFull Text:PDF
GTID:2192360215498235Subject:Aerospace Propulsion Theory and Engineering
Abstract/Summary:PDF Full Text Request
In primary combustion chamber, highly metal loaded propellant cannot completelyburn for lack of oxidant, so how to make metallic particles burning high efficiently insecondary combustion chamber is also a key technology of ducted rockets. This paperdiscusses the numerical computation of two phase flow in a ducted rocket based ondiscrete phase model using diffusion-vaporization controlled numerical model which usedfor hydrocarbon droplet combustion. Assuming that aluminium begin to vaporize at 2327K which is the melting point of the aluminum oxide, and aluminium oxide exists as a kindof gas which means ignoring the condensantion of aluminium oxide. Simple reacting flowmodel is established and used to simulate an experimental motor. It is shown that: (1)Thediameter of initial particles has great effect on the combustion efficiency of particle. If thediameter of the aluminum particles increases, the combustion efficiency decreases;(2)Increasing the air-fuel ratio, the combustion efficiency increases and the temperature inthe front of the secondary firebox increases, while at the end of the secondary firebox itdecreases in value; (3)Increasing the aluminum particle content, the combustion efficiencyincreases and the temperature in the front of the secondary firebox increases obviously,while the average temperature in firebox and the temperature on the wall increases slowly;(4)When the airspace varies, increasing the flying height, the temperature in the front ofthe secondary firebox decreses but at the end of the secondary firebox it increases in value,the combustion efficiency decreases obviously, and the temperature on the wall increasesobviously which means the secondary firebox needs additional ablative protection; (5)Ifthe length of the secondary firebox increases, the combustion efficiency increases.
Keywords/Search Tags:secondary firebox, combustion efficiency of aluminum particle, two-phase reacting flow, numerical simulation
PDF Full Text Request
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