Wind turbine blade with leeward reinforcement structures and windward reinforcement structures

A blade for a wind turbine, the blade extending in a lengthwise direction between a root end and a tip end of the blade, the blade comprising:

• a leeward shell portion and a windward shell portion, each of the shell portions defining respective inner and outer surfaces extending in the lengthwise direction between the root end and the tip end of the blade and in a chordwise direction between a leading edge of the blade and a trailing edge of the blade, wherein the blade extends in a thickness direction between the leeward shell portion and the windward shell portion, wherein the windward shell portion and the leeward shell portion are each formed of a laminate structure extending from the root end to the tip end;
• a main reinforcement structure internally within the blade, the main reinforcement structure comprising a first windward reinforcement structure engaging the windward shell portion and extending in the lengthwise direction of the blade from adjacent the root end to adjacent the tip end and a first leeward reinforcement structure engaging the leeward shell portion and extending in the lengthwise direction of the blade from adjacent the root end to adjacent the tip end;
• a rear reinforcement structure internally within the blade, the rear reinforcement structure comprising a second windward reinforcement structure engaging the windward shell portion and extending in the lengthwise direction of the blade and a second leeward reinforcement structure engaging the leeward shell portion and extending in the lengthwise direction,
• wherein the rear reinforcement structure is arranged closer to the trailing edge than the main reinforcement structure;
• and
• wherein the second windward reinforcement structure is longer than the second leeward reinforcement structure in the lengthwise direction.