The characteristics of flow field in the KYF-0.2 flotation cell are studied by CFD, and PIV test is also carried out to verify CFD simulation results. CFD simulation results show that there is a vortex near the slurry-ward surface of impeller blades in the direction against the rotation direction, there appears the maximum velocity which is higher than the speed at blade tips. Both PIV measuring results and CFD simulation results indicate that high velocity region appears near the exterior of stator blades,where the velocity value is about 1.5 m/s. Comparison between CFD and PIV show that there are good consistency in velocity change trend and velocity value.
Shock focusing techniques can avoid deflagration-to-detonation transition (DDT), which make PDE more efficiency. Numerical simulations of an idealized pulse detonation engine consisting of axial inlet and circumferential inlet are presented in this paper. Using detailed acetylene-air chemical kinetic model, investigation on detonation direct initiation by shock focusing is done. Studies indicate that in static flow field, the regions of high temperature and pressure created by shock focusing can produce detonation at the condition of circumferential inlet Mach 2.4. But in dynamic flow field, Mach number should increase to 3.5 to achieve detonation
Both the strong swirl and the flow around blunt bodies can form low velocity recirculation zone to stabilize combustion of highspeed gas. Compared with the vortex shedding mechanism of the V-gutter blunt, the computational results show that the vortex shedding mechanism of the coupling combustion stabilizer is controlled by the vortex of the swirling flow. Also, the flow around bluff body with swirling flow through the central opening can reduce drag, increase the length of the recirculation zone and reflux mass, and increase the number of vortexes so as to enhance the heat and mass transfer. Thus, coupling combustion stabilizer can enhance the stability of flame
HAT type cyanide leaching stirring tank increases gas-liquid mass transfer area to increase leaching speed through changing inflation mode. This article introduces the industrial experiment study situation of HAT6065 cyanide leaching stirring tank with the results show that slurry stirred and suspended evenly without delamination, which can adapt to the condition of high concentration of sulfur, iron and arsenic elements. The leaching rate of HAT6065 cyanide leaching stirring tank is about 6.61% higher than that of conventional cyanide stirring tank.
Strong swirl and a blunt body are two commonly used structure to form low velocity recirculation zone to stabilize combusting of high-speed gas. Compared with the vortex shedding mechanism of the square cylinder blunt, the computational results show that the vortex shedding mechanism of the coupling combustion stabilizer is controlled by the vortex of the swirling flow instead of the cylindrical vortex. Also, the flow around bluff body with swirling flow through the central opening can reduce drag, increase the length of the recirculation zone and reflux mass, and increase the number of vortexes so as to enhance the heat and mass transfer. Thus, coupling combustion stabilizer can enhance the stability of flame.
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