Powder injection molding turbine and structure optimization design method thereof

Abstract

The invention discloses a structure optimization design method of a powder injection molding supercharger turbine. The structure optimization design method is characterized that the fact that turbine stress concentration factor is minimum under the condition that a turbine structure is lightest and the rotation speed is the highest is used, a target function is optimally designed under the premise that the turbine structure satisfies the strength requirement and the service life requirement, the maximum equivalent stress under the highest rotation speed work state of the turbine is used as the constraint condition, and the turbine structure weight reduction feature geometric size is used as the design variable to build the optimal mathematic model of the turbine structure. The method has the advantages that a powder injection molding process is used, and inherent defects such as heat cracks, shrinkage cavities and shrinkage porosities of precision casting are eliminated effectively; the constraint condition during optimization can be reduced, the existing turbine structure form can be changed, turbine structure can be optimized maximally, the sizes of parts of the turbine are determined by the method, turbine weight can be reduced maximally under the premise that the turbine structure strength requirement and the application requirement are satisfied, and turbine light weight is achieved.

Description

technical field [0001] The invention belongs to the research field of turbine structure design of gas turbine machinery, and in particular relates to a powder injection molding turbine lightening remodeling structure and a multi-objective optimization design method. Background technique [0002] Turbocharging is one of the main directions of the development of piston internal combustion engine technology in the world today, and it is the most important way to strengthen the engine. The engine adopts turbocharging technology, which can greatly increase the output power, increase the volume and weight power density (strengthening the engine saves resources), improve economy, save energy, improve exhaust pollution, reduce noise, and compensate for power loss in plateau environments. The core components of a turbocharger are the turbine in the turbine chamber, which is propelled by the flow of hot exhaust gas, and the compressor wheel on the cold air side. The compressor impell...

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Problems solved by technology

However, the proposed structure is not obtained through optimization technology, nor does it involve the optimization design method of the turbine structure. The new turbine structures proposed in the above patents are not optimal structures.

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