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借助于纹影法光学系统在高速激波管中研究了喷枪位置、形状与气固两相流分布的关系。由纹影照片可以看出,颗粒喷入气流的物理过程可以分为三个阶段:喷入阶段;混合阶段和完全混匀阶段。在煤粉燃烧和气化技术中,采用大直径和喇叭型喷枪有利于颗粒在气流中迅速散射,而且喷枪端部压力变化使气固两相之间相对速度增加,从而改善了传质过程。这些结论对于进一步提高喷吹量和改善燃烧、气化过程有一定意义。
The relationship between the position and shape of the lance and the distribution of gas-solid two-phase flow was studied in the high-speed shock tube by means of the schlieren optical system. As can be seen from the smear photos, the physical process by which the particles are injected into the gas stream can be divided into three phases: the injection phase, the mixing phase and the complete mixing phase. In the pulverized coal combustion and gasification technologies, the use of large diameter and horn guns facilitates the rapid scattering of particles in the gas stream, and changes in the pressure at the end of the gun increase the relative velocity between the gas and the solid phases, thereby improving the mass transfer process. These conclusions are of great significance to further increase the injection volume and improve the combustion and gasification process.