Blade platform, blade ring, impeller disk and gas turbine engine

A system, comprising:

• a blade platform, the blade platform comprising a pair of side edges and a pair of bottom edges,
• wherein respective side edges of the pair of side edges comprise:
• a linear portion and a curved portion, wherein the linear portion comprises a first linear portion and a second linear portion, and the curved portion comprises a first curve portion and a second curved portion,
• wherein the first linear portion and the second linear portion are connected to two ends of the curved portion and are tangent to the curved portion, slopes of the first curved portion and the second curved portion are in a same direction and the first curved portion is externally tangent to and connected to the second curved portion;
• and
• a blade ring, the blade ring comprising a plurality of blades, each blade is provided with the blade platform, wherein respective side edges of the pair of side edges have a same structure, and the side edges of the blade platform of adjacent blades have the same structure;
• wherein the blade platform is an inclined-edge platform and angle of the platform is not a 90° right-angle, wherein the angles between the bottom edge and connecting lines of end points of a first bottom edge and a second bottom edge of the inclined-edge platform on the same side are acute angles;
• wherein the first linear portion and the second linear portion are respectively located at two ends of the side edge and connected to adjacent side edges, and a center of the first curved portion and a center of the second curved portion are respectively located at two sides of the side edge;
• wherein the adjacent blades rotate by a same angle around the centers of their own tenon under a centrifugal force of the blade ring, such that the first curved portion and the second curved portion provided on the side edges of the adjacent blade platform are separated to form a non-contact structure, with a non-uniform gap between the non-contact structure, the first linear portion and the second linear portion provided on the side edges of the adjacent blade platform are attached for connection, without an intermediate locking part provided between the blade platforms at the two ends of the blade ring in a circumferential direction.