The power matching and performance test design method of the new model pair rotary fan combines the characteristics of the isolated method with the characteristics of the plane cascade method. The two stages adopt equal pressure distribution, and the flow pattern is completed with different distortion laws at different positions of the radial leaf height. The aerodynamic design of the blade, for the problems of the original model, properly improved the function of the top of the secondary blade, so that the power matching of the two stages has been significantly improved. Figure 4 shows the two-stage power characteristics of the new model to the cyclone. Obviously, the function of the second-stage fan of the new model is improved, and the power characteristics decrease slowly with the change of the flow rate; the power characteristics of the first-class motor are significantly lower than the power characteristics of the original machine, and the characteristic curve is flat. The motor can work smoothly. The difference in power between the first and second stages of the motor is reduced, and the two-stage matching tends to be reasonable. The performance characteristics test of the whole machine shows that the working range is expanded, the highest total pressure efficiency reaches 8513%, which is nearly 9% higher than before the improvement, and the effect is very obvious. The original model: Z1=11, Z2=9, H1=3817b, H2=26b new model: Z1=13, Z2=11, H1=3215b, H2=23b313 improvement before and after power matching characteristics analysis can be seen before improvement When the two-stage motor is operated under different working conditions, the variation of power characteristics is very different. The first-stage impeller always works at full load, and the secondary impeller bears a small amount of added work. Obviously, when the whole machine is in operation, the secondary level becomes the resistance in the operation of the fan, especially in the large flow area, the head of the fan mainly relies on the first-stage moving impeller, while the second stage hardly works. In the large flow range of 450-500m3Pmin, the output power of the secondary motor only reaches 50%-20% of the rated power, and the secondary power loses the function of 50%-80% of the rated power, resulting in the wind pressure and air volume of the fan. The problem of obvious reduction, low efficiency and reduced working range. Through the secondary impeller, the function is improved, so that the secondary power is changed gently in the large flow area (400-500m3Pmin), and the secondary motor plus function is always within the range of 90%-65% of the rated power. The added function is always maintained at about 80% of the rated power. The two-stage matching range is wide, and the inflow before and after the two-stage impeller is also relatively stable. Therefore, the well-matched counter-rotating fan has a wide range of working conditions, an improved indenter, and an improved overall pressure efficiency. The performance of the new model is greatly improved in terms of indenter characteristics and efficiency characteristics, and the industrial utilization area is expanded at the same time, and the energy saving effect is obvious when used. Under the condition that the total power is not overloaded, the quality of the two-stage power matching has a direct relationship with the aerodynamic design of the whole machine. The well-designed blade can fully exert its functional force, make the work distribution of the two-stage impeller reasonable, improve its internal flow state, the power of the two motors in the whole operation area is not overloaded, the power curve changes gently, and the whole machine is improved. performance.
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Discussion and analysis of a certain performance of cyclone machinery
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