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为了解丙烷的爆震特性,在60 mm×60 mm×2 000 mm的方爆震管内,分别用空气、纯氧以及它们的混合物作为氧化剂进行了单次爆震性能的试验研究.利用安装在同一截面上的压力传感器与离子探针同时测得缓燃-爆燃转捩(DDT)位置处爆震管内的压力、火焰传播速度和方向.获得了丙烷的起爆性能和DDT特性、压力波与火焰的传播规律.试验结果表明:①在本试验管道内利用空气作为氧化剂无法形成爆震波,而丙烷和纯氧混合物的DDT距离则很短;②在化学恰当比条件下DDT的距离最短,但随着氮气含量的增加DDT距离会增长;③DDT过程中压力波和火焰具有相近的变化趋势.
In order to understand the detonation characteristics of propane, a single detonation performance test was conducted using air, pure oxygen and their mixtures as oxidant in a square detonation tube of 60 mm × 60 mm × 2 000 mm respectively. The pressure, flame propagation velocity and direction of the detonation tube at the location of the flame retardancy-deflagration transition (DDT) were simultaneously measured by the pressure sensor and the ion probe in the same section, and the detonation performance and DDT properties of propane were obtained. The pressure wave and flame The results show that: ① the detonation wave can not be formed by using air as the oxidant in the test pipeline, while the DDT distance of propane and pure oxygen mixture is very short; ② the distance of DDT is the shortest under the proper chemistry condition, With the increase of nitrogen content, DDT distance will increase; ③DDT process pressure wave and flame have similar trend.