Design Wind Power Turbine - Hybrid Anisotropic Materials for Wind Power Turbine Blades - page 36

Contour of spar profile

Bush

Coupling

Approx. 15-20 meters

Twist coupling effect

FIGURE 2.14
Twist.coupling.effect.

FIGURE 2.15
Pultrusion.spar.for.root.sections.

The. second. variant. for. redesigning. shear. web. proile. spars. is. shown. in.
Figure 2.16..A.wood.or.aluminum.mandrel.can.be.used.for.the.tape.wind-
ing.process..Shear.web.proile.has.varied.dimensions.from.root.sections.to.
middle.sections.(Figure 2.17).
Other.options.for.making.pultrusion.web.proiles.can.include.the.winding.
shell.process.with.three.removable.mandrels..It.can.be.seen.in.Figure 2.18..
Carbon.iber.strips.are.indicated.in.unsupported.leading.and.trailing.edges.
and. they. add. additional. stiffness.. Shear. web. pultrusion. spars. are. con-
nected.by.adhesives.in.a.longitudinal.direction,.which.also.resists.a.bending.
moment.. Torsion. moment. in. a. ±45 ° . direction. are. reinforced. by. HexForce â .
bias.weave.fabrics.(see.Chapter.3,.section.3.4).

2.8.5 Shell Curing Mold Prepreg Process

The.method.of.manufacturing.sophisticated.parts,.such.as.turbine.blades.by.
preliminary.curing.prepreg.to.50.percent,.was.invented.in.1969. 18 .We.used.
this.method.to.preliminarily.seal.the.rubber.ilm.(Figure 2.19).
The.purpose.is.to.create.a.vacuum.pressure.between.the.sealed.ilm.and.
the.laminate.prepreg.layers..Therefore,.we.avoid.having.to.inject.liquid.resin.
and.this.saves.time.in.the.curing.process..We.use.power.cement.forms.for.
molding.shell.laminates. 19