【摘要】：本文研究了固體沖壓發(fā)動機(jī)補(bǔ)燃室內(nèi)含硼推進(jìn)劑的燃燒,并對補(bǔ)燃室結(jié)構(gòu)進(jìn)行了優(yōu)化。其中包括利用Ansys Workbench完成參數(shù)化建模,并編制程序探究了單個硼顆粒的點(diǎn)火過程。對Fluent進(jìn)行了二次開發(fā),研究了補(bǔ)燃室內(nèi)含硼推進(jìn)劑的兩相流燃燒,并利用參數(shù)化建模對補(bǔ)燃室結(jié)構(gòu)進(jìn)行了優(yōu)化。氣相結(jié)果表明：補(bǔ)燃室頭部存在高溫回流區(qū),而中心軸線附近溫度較低。燃料入口處存在大的渦旋結(jié)構(gòu),空氣入口處存在較小的渦旋結(jié)構(gòu)。對單個硼顆粒點(diǎn)火的研究表明：減小顆粒初始半徑、減小初始氧化層厚度、增加環(huán)境溫度、增加環(huán)境中氧氣與水蒸氣的摩爾分?jǐn)?shù)會縮短點(diǎn)火時間。顆粒初始半徑、環(huán)境溫度、水蒸氣的摩爾分?jǐn)?shù)在一定范圍內(nèi)將顯著影響點(diǎn)火時間,超出一定范圍后對點(diǎn)火時間的影響出現(xiàn)“邊際效應(yīng)”。點(diǎn)火時間隨著初始氧化層厚度增加而線性增加,增加氧氣摩爾分?jǐn)?shù)對縮短點(diǎn)火時間的作用不明顯。對含硼推進(jìn)劑在補(bǔ)燃室內(nèi)兩相燃燒的研究表明：補(bǔ)燃室軸線附近顆粒點(diǎn)火較慢。燃料與空氣接觸面附近顆粒點(diǎn)火較快。顆粒在點(diǎn)火位置附近迅速融化為液態(tài)。補(bǔ)燃室中心軸線附近氧氣濃度較低,顆粒的燃燒較慢。增加顆粒的初始直徑,點(diǎn)火位置基本不變,顆粒燃燒效率顯著降低。增加顆粒初始氧化層厚度,點(diǎn)火位置明顯后移,顆粒燃燒效率略微下降�；趨�(shù)化建模的補(bǔ)燃室結(jié)構(gòu)優(yōu)化表明：參數(shù)化建�？煽焖俚玫窖a(bǔ)燃室優(yōu)化結(jié)構(gòu),從而提高硼顆粒燃燒效率。
[Abstract]:In this paper, the combustion of boron propellant in the afterburner of solid ramjet is studied, and the structure of the combustor is optimized. The parameterized modeling is completed by using Ansys Workbench, and the ignition process of single boron particle is studied by programming. The secondary development of fluent was carried out, and the two-phase flow combustion of boron-containing propellant in the reburning chamber was studied, and the structure of the reburning chamber was optimized by parameterized modeling. The gas phase results show that there is a high temperature reflux zone at the head of the combustor, while the temperature near the center axis is low. There is a large vortex structure at the fuel entrance and a smaller vortex structure at the air entrance. The results show that the ignition time can be shortened by decreasing the initial radius of boron particles, decreasing the thickness of the initial oxide layer, increasing the ambient temperature and increasing the mole fraction of oxygen and water vapor in the environment. The initial radius of particles, ambient temperature and mole fraction of water vapor will significantly affect the ignition time in a certain range, and beyond a certain range, the influence on the ignition time will have a "marginal effect". The ignition time increases linearly with the increase of the initial oxide thickness, but the effect of increasing the oxygen molar fraction on the ignition time is not obvious. The two-phase combustion of boron containing propellants in the reburning chamber shows that the ignition of particles near the axis of the reburning chamber is slow. Particles near the interface between fuel and air ignite quickly. The particles melt rapidly into liquid near the ignition position. The concentration of oxygen near the central axis of the combustor is lower and the combustion of particles is slower. When the initial diameter of the particle is increased, the ignition position is almost unchanged, and the combustion efficiency of the particle decreases significantly. When the initial oxide layer thickness is increased, the ignition position is obviously moved backward, and the combustion efficiency of the particles decreases slightly. The structural optimization of the secondary combustion chamber based on parametric modeling shows that the optimized structure of the secondary combustion chamber can be obtained quickly by parameterized modeling, thus improving the combustion efficiency of boron particles.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK401

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本文編號：2139013