摘要
粉末连续旋转爆轰发动机不仅具有爆轰循环热效率高的优势,还兼具粉末燃料体积热值高、流量可调等优点,然而发动机的工作特性会受到煤粉的物理性质影响。为了更好地研究不同物理性质煤粉对于爆轰波传播特性的影响,搭建一套定容燃烧弹,结合高能点火系统,在初始压力p 0=100 kPa下,研究多孔状5μm、多孔状40μm及片状5μm共3种无烟煤粉在不同当量比(0.7、1.0、1.3、1.5)下的爆轰波传播特性。研究结果表明:多孔状5μm无烟煤随着当量比的增加,爆轰波速度及压力持续增加,当量比为1.5时具有最大爆轰波传播速度及压力;多孔状40μm煤粉在0.7~1.3当量比下随当量比的增大,爆轰波速度持续增加,而后在当量比为1.5时由于过量的煤粉导致速度开始降低,但爆轰压力随着当量比的增加而增加;5μm多孔状煤粉爆轰波速度在相同当量比下优于40μm煤粉;片状5μm煤粉爆轰特性最差,在高当量比时会抑制爆轰。
The continuous rotating detonation engine with coal powder as fuel has the advantages of high thermal efficiency of detonation cycle,high volumetric calorific value of powder fuel and adjustable flow rate,etc.However,the operating characteristics of the engine are influenced by the physical properties of coal powder.In order to study the effects of different physical properties of pulverized coal powder on the propagation characteristics of detonation wave,the gas-solid two-phase detonation experiments was conducted with three types of porous 5μm,porous 40μm and flake 5μm anthracite pulverized coals,at different equivalent ratios(0.7,1.0,1.3,1.5).A test setup of constant volume combustion bomb was designed with a high energy ignition system at an initial pressure of 100 kPa.In the test cases of detonation with porous 5μm anthracite fuel,the detonation wave speed and pressure continue to increase with the increase in the equivalent ratio,and the maximum detonation wave propagation speed and pressure are achieved when equivalent ratio is 1.5.In the test cases of detonation with porous 40μm pulverized coal fuel,with the increase in the equivalent ratio in the range of 0.7-1.3,the detonation wave speed continues to increase,and when the equivalent ratio is increased to 1.5,the detonation wave speed begins to decrease,but the detonation pressure increases.The detonation wave speed with 5μm porous pulverized coal fuel is better than that with 40μm pulverized coal at the same equivalent ratio;the detonation characteristics with flake 5μm pulverized coal fuel are the worst and suppress detonation at high equivalent ratio.
作者
张锋
罗永晨
肖博文
倪晓冬
郑权
翁春生
续晗
ZHANG Feng;LUO Yongchen;XIAO Bowen;NI Xiaodong;ZHENG Quan;WENG Chunsheng;XU Han(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2024年第5期1663-1672,共10页
Acta Armamentarii
基金
国家自然科学基金项目(12002167)
中央高校基本科研业务费专项资金项目(30919011259)。
关键词
粉末连续旋转爆轰发动机
爆轰
煤粉
直接起爆
传播特性
气-固两相爆轰
powder continuous rotating detonation engine
detonation
coal particle
direct initiation
propagation characteristics
gas-solid two-phase detonation
