| Gas turbine is very sensitive to the quality of its intake air. Low quality of intake air not only makes the gas turbine out of its operating conditions, but also causes irreversible damage. Therefore the development of high-efficiency gas turbine inlet filter becomes very important. Vortex tube air intake filter is a kind of axial-flow cyclone separator with guide blades, a relatively new type, which is mainly utilized for the inlet protection of the helicopter. Most vortex tubes of the helicopters have the following characteristics:big length-diameter ratio, large resistance coefficient and high efficiency. The public literatures on the vortex tube separator are less both home and abroad. And there are no public literatures which consider the comprehensive effect of the vortex tube structure parameters on its performance.In this paper, author designs a new vortex tube structure which is small length-diameter ratio, low resistance coefficient and high efficiency based on the basic structure and principle of the helicopter vortex tube. With the help of the orthogonal design, the research plan is designed scientifically and reasonably. The author studies the vortex tube through the method combining the numerical simulation with experimental text. On the aspect of data processing and its in-depth analysis, this paper draws support from the secondary response surface method. The main research of this paper is shown as following:1. Numerical simulation method research of the axial-flow cyclone separator with guide blades. First select the proper orthogonal table to arrange the numerical simulation method of different pressure-velocity coupling algorithm, turbulent model, discretization scheme and the pressure interpolation. And then simulate the axial-flow cyclone separator with straight blade, in order to obtain the most suitable numerical simulation method of its macro properties. This lays the foundation for the numerical simulation of the vortex tube performance.2. Numerical simulation research on the performance of the vortex tube. The vortex tube is designed with small length-diameter ratio and low resistance. With the orthogonal table, this paper arranges different structural parameters combinations. And then study the structure effect on the performance with numerical simulation. With the secondary response surface method, deeply analyze the data and obtain the mathematical model between the performance parameters and dimensionless structure parameters. The complex correlation coefficient of the model is greater than0.98, and it indicates a higher fitting precision. This can provide the basis for the optimal design of the vertex tube.3. Optimal design of the vertex tube. Using the vortex tube performance mathematical model, the author designs a vertex tube which is high efficiency, low resistance according to the certain requirements considering the best match of the resistance and efficiency. And obtain the resistance characteristic curve, the classification efficiency characteristic curve as well as the law of the blade thickness and the bypass ratio effect on the performance.4. Experimental study. The author makes the experiment model of the optimal vortex tube to study the actual resistance and efficiency performance. The average value of error between the resistance experiment and numerical simulation is within5.6%. This indicates the resistance mathematic model can estimate the resistance of the vortex tube. And then obtain the optimal numerical simulation scheme of the macro performance of the axial-flow cyclone separator with guide blades:standard k-ε turbulent model and SIMPLE algorithm, second order pressure interpolation, second order upwind discretization scheme. |
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