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Leaves with a leading mobile leaf axial air flow angle α2 of the optimal export

530.017069441040.26360.026o0.01 d 69.071050.26400. Which 0.0 Li 768671060.2644O. Squirt 40.025868.241o70.26490.02810.029167.79l080.26540.02890. Beng 67.311090.26590. O2 Xin 0. O36466811100.26640.03040.040366.28Vo1.29, No. 6,2001 FLUIDMACHINERY13 coefficient c = O. 9, the drag coefficient = O. 03i, static pressure = 5100Pa, n = 3600r/rain, the results shown in Table 1, the efficiency of port and export flow angle curves shown in Figure 2 (a little computer program). Credit) Figure 2 the efficiency and outlet angle. : The curve 4 Conclusion (1) The results show that the existence of an optimal exit flow angle a (Ty), in this the most efficient, confirmed the previous idea, widely believed to correct the previous time of 90 ~ mouth of the highest fan efficiency point of view. Exit flow angle corresponding to the best efficiency value than the maximum efficiency of 90 higher when Xing is about 3, indicating that the optimization of the angle effect is significant. (2) to determine the exit flow angle, the other parameters, such as Lu 2,, a and. , \The change, then a, the optimal value may change. (4) the loss of fan blade flow loss in the largest proportion. (5) at an angle of 90 around the outlet size of the loss of the basic convolution is symmetric: decreases and then increases; blade and guide vane flow loss is increased. Therefore, the efficiency of the value before the change of 90 to slow; efficiency value of more than 90 ~ down soon after, expressed as the inflection point occurred at 90. (6) the conclusion of a section about the fan, is generally preferable to the middle section,ugg italia, and for other cross-section should also include: the optimal value, but must take into account both the distortion of the leaf rules. References 1 Ye Zengming. per guide Theoretical efficiency axial flow fan leaf calculation and analysis. Energy Research and Information, 19872 Yezeng Ming., high head low flow single-stage axial fan design and optimization methods. Shanghai University of Technology .19943 AllanR.Wallls: A., daIn0wFmlsandDucts.Wil A Imex ~ ienc: ePublicatitm, 1983 of the tube left foot r: Yezeng Ming, male, senior engineer, mainly in trouble round the ugly tired and fan aerodynamic research, has won the third prize of scientific and technological achievements j bamboo mat City, China Nonferrous Metals scientific and technological achievements ugly head Sidengjiang Department of Education Science and Technology Ministry of Machinery Industry Achievement Award. Mailing address: 200O30 Power Engineering Shanghai University. (Continued from page 10) r where - the system natural frequency,ugg stivali, = √, 1 damping than ,=--- cover 2mAK, (‰) from (5) can be seen in the diaphragm slurry pump system midge, volleyball pulp and dynamic process of energy exchange,ugg boots günstig, is a second-order oscillating system. system natural frequency affect the system response speed, the greater the faster the response; and damping ratio directly affects the stability of the system, ∈ the greater the divide runs more smoothly. we can see from the expression, and isolation tank is proportional to the effective cross-sectional area A, and isolation Tank volume l, and the diaphragm is inversely proportional to mass m. Therefore, to increase the natural frequency, the relative increase in cross-sectional area should be A, and reduced diaphragm mass m. the diaphragm down during normal operation the basic operation of the resistance is a constant,stivali ugg, so the outside disturbance force on the dynamic effects can be ignored. and can be seen from the expression, since the damping coefficient c is very small,ugg prezzo, isolation tank in a dynamic process, when there is a step input, its great velocity overshoot is likely to cause water hammer. Therefore, the design should give due consideration to the tank wall thickening. increase the c values, to reduce the valve area gradient, you can avoid the step input, to avoid the diaphragm strokes up dead, so as to control the occurrence of water hammer. 3 Conclusion diaphragm slurry pump model experiments show that the diaphragm slurry pump design is established, the main structure is feasible. Diaphragm Slurry Pump Dynamic Analysis System for determining the geometry of mechanical components offers theoretical basis for the development and application of the pump has some significance. of the left foot cylinder r | Roy Tan Hardy, female, 1957, engineering hardware with disabilities, senior engineer. Mailing address: 110044, Liaoning Province, Shenyang University, Box 33, Institute paste.

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