Numerical Simulation And Experimental Study Of Axial Flow Cyclone Separator

Axial flow cyclone separator with guide blades (ACS) is a kind of device to separate particles from air flow through centrifugal force generated by the rotary motion of two-phase flow. Low resistance, large mass flow throughout, small volume and reasonable process layout are its advantages. ACS's interflow is strong rotational turbulent flow, and fulfilled with many complex conditions, such as dual-phase separation, interaction, adsorption, and electrostatic interference which made lots of obstacles to its mechanical research, although ACS's advantages above. ACS's flow patterns and separate mechanism are still not fully recognized until now.Experimental study and numerical simulation are combined to do intensive research on ACS's general flow characteristics according to its physical structure in this dissertation. And ACS's characteristics of inter flow field and separation performance to solid particles could be more comprehesively achieved. The main contents of this dissertation are as follows:1. The experimental research on the resistance performance of the axial flow cyclone separator. Build a wind tunnel experiment section to measure the resistance performance of the single-tube axial flow cyclone separator. And some detailed study is done on the resistance characteristics of the axial-flow cyclone separator and its main components. Then the detailed resistance characteristic parameters of the whole cyclone separator are well obtained. This lays a foundation for the verification of the numerical simulation.2. The experimental research on the pressure distribution along the outside wall of the axial cyclone separator. With the help of the high-accuracy pressure measuring instruments, the detailed data of the pressure distribution characteristics on the outside wall were measured. The results are disposed with the non-dimensional method. Also the pressure distribution characteristics of the cyclone separator are obtained. This provides a basis for validating the numerical simulation results.3. The experimental research on different solid particles separation efficiency of the axial flow cyclone separator. Design a quantificational feeding device to do some experiments on the separation efficiency of different solid particles. Do experiments on separation efficiency of the different granules under different inlet velocity conditions and the separation efficiency of the granules with different diameters under the same inlet velocity respectively. Finally, the more complete separation efficiency characteristics of the axial flow cyclone separator are obtained. 4. The suitable numerical simulation method is selected according to the experimental results. The detailed and general numerical simulation is conducted on the internal flow field of the axial flow cyclone separator. And analyse the distributon of several typical flow parameters of the internal flow field. Then we obtain the distribution law of the flow field characteristic parameters. The resistance of the cyclone separator is obtained by numerical simulation method, and compared with the experimental results. The numerical simulation results are consistent to the experiment. With the help of numerical simulation, it conducts the research on the effect of the operation pressure and the temperature on the performance of the cyclone separator.5. Utilizing the numerical simulation method, obtain the non-dimensional flow pattern distribution characteristics, back flow boundary characteristics of the internal flow field, and the characteristic parameters distribution of the swirling number in the interior of the axial flow cyclone separator.6. Analyzing the mechanism of the internal energy loss inside the axial flow cyclone separator. Also criteria formula of running pressure and temperature to ACS's resistance is put forward and verified through numerical simulation.7. Doing two-phase flow simulation inside the axial flow cyclone separator and obtaining the grade separation efficiency. Comparision between the simulation result and experimental data show that boundary conditions used in two-phase simulation is reasonable.