Blade profile tube nozzle for gas turbine

A blade profile tube nozzle for a gas turbine, comprising:

• an inlet section which is an annular passage;
• a tapered section which comprises a plurality of airflow circulation passages separated by a plurality of blades;
• and
• an outlet section, comprising circular tubes respectively connected to the outlets of the airflow circulation passages correspondingly and with the diameter not changing along the axis;
• wherein the inlet section, the tapered section and the outlet section are sequentially connected in a flow direction of airflow,
• and each of the airflow circulation passages is enclosed by an outer circumferential wall face, an inner circumferential wall face, a suction face of one of two adjacent blades and a pressure face of the other one of the two adjacent blades, and cross-section of an inlet of the airflow circulation passage is fan-shaped,
• and from the flow direction of the airflow, with regard to each of the airflow circulation passages, the fan-shaped cross-section gradually and smoothly transitions to a circular cross-section from the inlet to an outlet of the airflow circulation passage, wherein the two adjacent blades are provided as a turning point of a dominant airflow in a circumferential direction of the nozzle, and the outer circumferential wall face and the inner circumferential wall face are provided as a turning point of the dominant airflow in a radial direction of the nozzle,
• wherein the outlet section is a spiral tube with a spiral line as an axis, the spiral line penetrates through the center of the circular cross-section, and a tangent line of the spiral line at the center of the circular cross-section is parallel to a normal vector of the circular cross-section.