Wide-flow-range turbocharger

Abstract

The invention provides a wide-flow-range turbocharger which comprises a turbine rotating shaft, a compressor volute, a middle body, an impeller and a turbine box. The turbine rotating shaft sequentially penetrates through the interior of the compressor volute, the interior of the middle body and the interior of the turbine box. The impeller is a two-mirrored impeller of an integrated structure and is arranged on the turbine rotating shaft in a sleeving manner. The compressor volute comprises a front-stage compressor volute body and a rear-stage compressor volute body. The front-stage compressor volute body and the rear-stage compressor volute body are provided with a front-stage air inlet channel and a rear-stage air inlet channel to form a double-air-inlet structure. Bidirectional air inlet of the double-air-inlet structure forms a shared diffuser structure at a diffusion cavity, where the rim of the impeller is located, of the front-stage compressor volute body. The wide-flow-range turbocharger has the beneficial effects that the double-air-inlet structure and the double-mirrored impeller of the integrated structure are adopted, the flow range is broadened greatly on the aspect of performance, the performance of a compressor is improved, and the two-stage air inlet shared diffuser is achieved.

Description

technical field [0001] The invention belongs to the technical field of exhaust gas turbocharging, in particular to a turbocharger with a wide flow range. Background technique [0002] Diesel engines show problems such as insufficient power, reduced economy, and reduced reliability when operating in plateau areas, mainly because the atmospheric conditions of plateaus are significantly different from those in plains, and insufficient pressurization and intake are caused. As altitude increases, atmospheric pressure decreases and air density decreases. For every 1000m increase in altitude, the atmospheric pressure will drop by about 9%, and the average atmospheric temperature will drop by about 6.5°C. When the altitude rises from sea level to 4000 meters, the air pressure drops from 100kPa to 61kPa, a drop of 40%, and the air density drops from 1.2kg / m3 to 0.8kg / m3, a drop of 33%. For turbocharged or supercharged intercooled engines, although they have a certain ability to aut...

AI Technical Summary

Problems solved by technology

The complex transonic shock wave, shock wave and boundary layer interaction, vortex separation flow and other phenomena lead to a sharp decline in the stability of the centrifugal compressor, and the narrowing of the available flow range of the supercharger, making the best match between the diesel engine and the supercharger It is becoming more and more difficult, and there is an urgent need to explore a new booster technology with a wide flow range

Images