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爆震波在开缝式弯管内的传播特性研究

Study on Propagation Characteristics of Detonation Wave in Slotted Elbow
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摘要 为了解旋转爆震波在单侧部分受限情况下产生的波系结构及环缝内压力波动特点,以恰化学当量比的氢气/氧气混合物作为反应物,采用9组分19步的基元反应模型,忽略粘性、热传导和扩散等输运效应,对爆震波在开缝式弯管内的传播情况进行了数值模拟。研究结果表明,爆震波在开缝式弯管内传播时,爆震波及爆震区内的反射激波后的高压区都会在环缝内产生透射激波,但环缝内激波不单纯依赖弯管内高压区的侧向膨胀产生,且环缝内的一些反射激波产生的波后高压区还会反过来在爆震区内产生透射激波;环缝内第二道斜激波会被接触面分为两部分,在接触面前方的惰性气体一侧具有更大的倾斜角;环缝位于外侧时爆震波的倾斜程度比位于内侧时更大;当环缝处于外侧和内侧时,会由于激波相交、反射产生比第一道斜激波更大的压力峰值,内侧开缝时环缝内最大压力峰值约为第一道斜激波后的两倍,且内侧开缝时环缝内压力大于4倍填充压力的高压区域范围比外侧开缝时大36.4%。 In order to study the shock structure and pressure fluctuation characteristics in the case of unilateral partial limitation due to the rotating detonation wave,a reduced kinetic mechanism based on 19-step reaction and 9 species for equivalent hydrogen/oxygen was used to simulate the process of detonation propagating in a slotted curved pipe.Transport processes such as thermal conduction,diffusion and viscosity were ignored.The results show that when a detonation wave propagates in a slotted elbow,transmitted shock is generated due to the high-pressure behind the detonation and the reflection wave in curved pipe.However,the shock wave within ring gap is not purely dependent on the high pressure in the elbow.The high-pressure zone produced by some reflected shock waves in the annular gap will also produce the transmitted shock wave in the detonation region.The second oblique shock waves in the annular gap are divided into two parts by contact surface,and the part of the front of the contact surface has a larger inclination angle.When the slot is on the outer side,the inclination of the detonation wave is greater than that at the inner side.When the ring gap is in the outside and inside,the pressure peak that is greater than the pressure behind of first oblique shock is generated due to the intersection and reflection of shock waves.The maximum pressure peak in the annular gap is about twice that of the first oblique shock wave when the ring gap is in the inside.When the slot is located on the inner side,the range of high pressure is 36.4% larger than that when the slot is located on the outer side.
作者 潘鑫峰 雷雨冰 PAN Xin-feng;LEI Yu-bing(Jiangsu Province Key Laboratory of Aerospace Power System,College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处 《推进技术》 EI CAS CSCD 北大核心 2019年第1期123-129,共7页 Journal of Propulsion Technology
关键词 开缝式弯管 爆震波 激波 倾斜角度 压力峰值 Slotted elbow Detonation wave Shock wave Inclination angle Pressure peak
作者简介 通讯作者:潘鑫峰,硕士生,研究领域为爆震燃烧。E—mail:cfboys@sina.com.
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