Interlayer, spar cap and wind turbine blade

A flow-enhancing fabric (1) extending in a longitudinal direction (6) and in a transverse direction (8), the fabric comprising a plurality of fibre layers including a first fibre layer (10) and a second fibre layer (20) arranged upon each other, the first fibre layer (10) comprising a first plurality of fibre bundles, the first plurality of fibre bundles comprising a plurality of first glass fibre bundles (14) and a number of first carbon fibre bundles (13), and the second fibre layer (20) comprising a second plurality of fibre bundles, the second plurality of fibre bundles comprising a plurality of second glass fibre bundles (24) and a number of second carbon fibre bundles (23),

• wherein the plurality of first glass fibre bundles (14) and the number of first carbon fibre bundles (13) of the first plurality of fibre bundles each extend parallel to one another in a first fibre direction (16),
• wherein the plurality of second glass fibre bundles (24) and the number of second carbon fibre bundles (23) of the second plurality of fibre bundles each extend parallel to one another in a second fibre direction (26),
• wherein the first fibre direction (16) is different from the second fibre direction (26), such that a number of the first carbon fibre bundles (13) intersect and contact a number of the second carbon fibre bundles (23),
• wherein the fabric further comprises a plurality of monofilaments (30) arranged between the first and second fibre layers (10, 20) along the transverse direction (8) of the fabric, the plurality of monofilaments (30) each having a mutual spacing (31) between them, and
• wherein the plurality of monofilaments (30) are arranged within a plane which is parallel to a plane in which the first fibre layer (10) is arranged and which is parallel to a plane in which the second fibre layer (20) is arranged.