Mach number effect on axials


A simple but effective technique for calculating the loss in an axial-flow turbine has been developed. In the loss computation, the blade geometry, the spacing between the blades, the aspect ratio, the thickness ratio, and the effect of the Reynolds number are taken into account. However, those factors not taken into account are the stagger angle, the trailing edge thickness, and the effects of Mach number. Neglecting Mach number effects causes a problem in the highly loaded stages. The optimum solidity (cr = c/s) of the blades is computed from  [c.365]

Figure 6-5 (a) shows the special case of axial outflow, associated with a single-stage fan with a stator row preceding the rotor. This case has no residual whirl velocity at the exit. As a multistage design, it offers the advantage of acceleration in the stator, since R > 1, which has the effect of smoothing out the flow and providing the best possible conditions for the rotor. However, it has the disadvantage of having a very high relative velocity, Vri, and possibly a high Mach number. It is, therefore, unsuited for the first stage of the compressor, where Vg and u are high and the temperature is at its lowest, but may be more suited for the later stages where the Mach number may be lower.  [c.230]

The operation is modeled ia terms of theoretical equiUbrium trays having the same significance as ia fractionating columns (see Distillation). SoHd and hquid are assumed to dow continuously through hypothetical weU-mixed theoretical trays ia which equiUbrium is attained. The number of theoretical trays has no relation to the number of bed segments ia the actual operation. Each segment can be equivalent to many theoretical trays. The number is determined by bed height, mass-transfer coefficient, and dow rates. Axial mixing is generally of much greater significance ia Hquid than ia vapor systems because of the greater mass of process duid ia the voids relative to that ia the pores. To allow for the effect of axial mixing ia the Hquid phase, a second parameter is iatroduced iato the model by assuming that the soHd entrains a certain quantity of Hquid from deck to deck.  [c.297]


See pages that mention the term Mach number effect on axials : [c.68]   
Compressors selections and sizing (1997) -- [ c.23 ]