Pure radial supersonic speed micro turbine structure with air bearing

Abstract

The invention relates to a pure radial supersonic speed micro turbine structure with an air bearing. The structure is characterized in that air flow enters a turbine stator runner (5) from the radial direction, and then the flowing direction of the air flow in a turbine is always kept in the radial direction; according to a stator part, stator blades (2), an upper casing (1) and a lower casing (4) form a contraction and release flow channel, and the cross section area of a throat part of the flow channel is equal to the critical area of designed flow, so that airflow is accelerated to supersonic speed; an inlet blade of a rotor impeller (3) is in a blunt end shape to block part of the flow area so as to adapt to the small flow design requirement of the micro turbine; and dynamic pressure grooves (7) are engraved in the back face and the edge of the rotor impeller (3) and matched with the lower casing (4) to form a dynamic pressure air bearing runner (6), and when the rotating speed of the turbine reaches a design value, air in the dynamic pressure grooves provides supporting force due to the viscous effect, and the thrust and radial bearing effects are achieved. The structure can realize expansion acting of small-flow high-pressure gas and has the characteristics of being compact in structure, extremely high in rotating speed, small in required flow, capable of acting by using cold air, high in expansion ratio and strong in acting capacity.

Description

technical field [0001] The invention belongs to the field of rotor dynamic mechanical structure design, and relates to a purely radial supersonic micro-turbine structure with an air bearing. Background technique [0002] The development of rotor power machinery has reached a very high level of technology, and large gas turbines and steam turbines provide a steady stream of high-power power in various fields such as energy, ships, and aerospace. But on the other hand, the miniaturization of turbines has always been a problem. The efficiency of turbines under the condition of small flow and low temperature is much lower than that of ordinary working conditions. Under these circumstances, solar energy, batteries or even piston heat engines are often used for energy supply. [0003] With the development of technology, the power density requirements for low-power application scenarios are gradually increasing. However, the development of solar energy and batteries requires rese...

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

Images