Pure radial supersonic micro-turbine structure with air bearing

Abstract

The invention relates to a purely radial supersonic micro-turbine structure with an air bearing, in particular: the airflow enters the turbine stator flow channel (5) from the radial direction, and then the flow direction in the turbine maintains the radial direction; (2) It forms a scaling flow channel with the upper casing (1) and the lower casing (4), and its throat cross-sectional area is equal to the critical area of ​​the designed flow rate, so that the air flow can be accelerated to supersonic speed; the inlet blade of the rotor impeller (3) is blunt. In order to block part of the flow area to adapt to the small design flow of the micro turbine; the back and edge of the rotor impeller (3) are engraved with dynamic pressure grooves, which form a dynamic pressure air bearing flow channel with the lower casing (4), and the turbine speed reaches At the design value, the gas in the dynamic pressure groove will provide support force by the viscous action and play the role of thrust and radial bearing. The invention can realize the expansion work of small flow and high pressure gas, and has the characteristics of compact structure, extremely high rotational speed, small required flow rate, cold air can be used for work, high expansion ratio and strong work ability.

Description

technical field [0001] The invention belongs to the field of rotor power mechanical structure design, and relates to a pure radial supersonic micro-turbine structure with a self-contained air bearing. Background technique [0002] The development of rotor-powered machinery has reached a high technical level, and large gas turbines and steam turbines have provided a steady stream of high-power power in various fields such as energy, ships, and aerospace. On the other hand, the miniaturization of turbines has always been a problem. The efficiency of turbines under low flow and low temperature conditions is much lower than that of ordinary working conditions. Therefore, in low-power application scenarios such as distributed energy, man-portable equipment, and aerospace satellite functions In the future, solar energy, batteries and even piston heat engines are often used for energy. [0003] With the development of science and technology, the power density requirements for low-...

AI Technical Summary

Problems solved by technology

[0008] The invention proposes a purely radial supersonic micro-turbine structure with its own air bearing, which solves the problems of supersonic airflow, ultra-high speed, and complex flow field structure under the high expansion ratio design of the current small-flow turbomachinery

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