A Low Biot Number Welded Volute with Unequal Circulation of Thin Wall Stainless Steel

Abstract

The invention discloses a low-biot-number welding type unequal circular rector volute made of thin-wall stainless steel materials. The volute specifically comprises a runner assembly, an outlet shell assembly and a positioning assembly. The outlet shell assembly and the runner assembly are welded into a whole with an inner positioning plane of an upper runner as a reference, the positioning assembly and the runner assembly are welded into a whole with an inner positioning plane of a lower runner as a reference, and the welding type supercharger volute is formed. The three assemblies are welded into a whole through a plurality of components. The low biot number of the volute is determined through the thickness and high heat conductivity of the volute, the volute model line is designed according to the unequal circular rector principle, and the thin-wall welding technology is adopted for forming. The volute is simple in structure and light in weight, and the requirement for aviation light weight is met. The response to the temperature change is fast, and the low temperature hysteresis and thermal inertia are achieved. The equal circular rector pneumatic design of a traditional turbine volute is changed into the unequal circular rector design, the section of a turbine inlet of the thermal insulation equal circular rector volute is corrected, and the pneumatic inertia of a turbine is reduced.

Description

technical field [0001] The invention belongs to the technical field of turbochargers for aviation piston engines, and in particular relates to a low Biot number welded unequal circulation volute made of thin-walled stainless steel. Background technique [0002] The turbine volute is an important part of the aviation piston engine. The high-temperature exhaust gas discharged from the aero-engine drives the turbine to do work in the volute flow channel. The material, structure, and shape of the flow channel of the volute have an important impact on the efficiency and reliability of the turbocharger. . The working temperature of the volute is between 1100°C and 1300°C, so the material of the volute should have good heat resistance and flame oxidation resistance. Since most of the main load borne by the turbocharger is transmitted to the turbine volute through the bearing body, it is required to have good mechanical strength. The shape of the flow channel of the turbine volute...

AI Technical Summary

Problems solved by technology

Although cast steel is a steel material with better casting performance, compared with metal materials such as iron and aluminum, the metal flow performance is relatively poor, and there is still a large gap in casting performance.

Therefore, the cast volute made of heat-resistant cast steel has a relatively thick wall and a relatively high overall weight, which does not meet the requirements of aviation lightweight

[0005] 2. High molding difficulty

Due to the poor metal fluidity and casting performance of cast steel materials, it is difficult to form the volute. In terms of structural process design, the structure is mostly simple in shape and easy to form, and the wall thickness should not be designed too thin. The design space of the volute is small, and there are certain limitations

[0006] 3. The development cycle is long

[0007] 4. High thermal inertia

But so far, there have been no reports on the application of the above two technologies to the manufacture of turbocharger volutes.

Images