Design Wind Power Turbine - Hybrid Anisotropic Materials for Wind Power Turbine Blades - page 50

+Mx

-Mx

Fiber orientation

Twist bending moment change from wind directions

FIGURE 2.22
Twist.bending.moment.change.from.wind.directions..

R c. . =.radius.of.sphere.section.of.root.turbine.blade,

h.. . =.middle.thickness.of.skin.root.section.of.turbine.blade.structure.

So,.we.replace.σ x. =.pR s /2h.and.input.in.Equation.(2.58).and.get.a.thickness.
in.a.tension.zone:.h.=.1.965.p.R s ;.in.compression.zone:.h.=.2.965.p.R s ..This.
means,.in.case.of.atmospheric.pressure.p.=.1kg/cm 2. and.radius.of.sphere.is.
approximately.1.cm,.thickness.of.shell.varies.2.to.3.mm.

2.11 DeflectionofWindHybridBlades

The.maximum.delection.of.cantilever.bar.under.aerodynamic.force.P,.which.
was.investigated.in.Ober,.Jones,.and.Horton: 23

PL
8EI

3

ω =

. . (2.59)

Here:
P.. =.uniform.load;
L.. =.length.of.bar;
E.. =.modulus.of.elasticity;
I.

=.moment.of.inertia.

Engineering.approaches.for.delection.cantilever.bar.also.had.been.done.in.
work. 24
With.maximum.delection.of.hybrid.cantilever.bar.with.iberglass.covers.
and.carbon.inner.webs,.Equation.(2.59).will.transform.in.Equation.(2.60).