文档介绍：南京航空航天大学硕士学位论文
摘要
为了提高多管脉冲爆震发动机的容积利用率,提高 PDE 的性能,采用扇形截面爆震管。
但扇形截面的爆震管相比于圆形截面爆震管,其爆震波触发和传播特性都发生了变化。为了能
摸清扇形 PDE 的工作特性,本文建立了三维扇形爆震管计算模型,利用适合的氢氧多步反应
机理、系统研究了扇形爆震管内不同燃料、不同结构下的爆震波特性,得到了如下研究结果:
首先,扇形截面爆震管内的爆震波的推进过程是一个由下弧面到上弧面、最后稳定在中间的一
个倾斜状态;其次,不同扇形截面结构(不同宽高比和弧度角)会影响爆震波的触发和传播特
性,通过结构对比,获得了一个在外半径为 情况下,宽高比为 ,弧度角为 45°的扇
形截面的优化结构;第三,不同结构的障碍物(钝体)也对扇形爆震管内的爆震波特性产生明
显影响,存在一个最佳障碍物结构;第四,由于爆震波传播速度很快,在单次爆震中辐射对爆
震特性的影响很小,但气体与壁面之间的辐射换热会影响爆震管内的温度分布;第五,通过对
扇形爆震管内产物成分分析与对比,发现在燃烧产物中,主要氮氧化物为 NO,主要污染物是
CO、NO,而在未燃混气中主要污染物是 N2O。
研究结果为多管 PDE 的工程应用提供了较强的理论基础和技术支持。
关键词:扇形截面爆震管,爆震波,数值模拟,反应机理,污染物
I
扇形截面爆震管内爆震波特性研究及产物分析
ABSTRACT
In order to improve the volume utilization and high performance of multitude pulse detonation
engine, a sector cross-section tube was used. As the characteristic of detonation wave initiation and
transmission in a sector cross-section is different from in circular cross-section tube, numerical study
method of three-dimensional detonation in a sector cross-section tube is established to find out the
characteristic of sector cross-section PED. The characteristic of detonation wave with different fuels
and structures in suitable chemical mechanism was studied, the results show that, first, the
progradation of detonation wave in sector cross-section tube is from the lower camber side to up
camber side ,then stability in the center of sector cross-section tube, in short, in a heeling condition .
Second, the annular-sector Structure play an important role in influencing detonation initiation and
transmission, the optimal section structure with aspect ratio of ,radians of 45 and external radius of
millimeters was obtained by simulating and analyzing multi sets of section parameters. Third, the
optimum obstacle to accelerate the deflagration to detonation transition was designed paring
with four different obstacle structures. Forth, the effect of radiation to the characteristic of detonation
wave in single pulse was little, but