Dual-zone turbine for turbocharging

Abstract

The invention discloses a dual-zone turbine for turbocharging. The dual-zone turbine comprises a turbine volute, wherein a turbine impeller is arranged in the turbine volute; a turbine blade is arranged outside the turbine impeller; a turbine air inlet, a volute air inlet runner and a volute air outlet are arranged on the turbine volute; a turbine impeller air inlet, a turbine impeller air inlet runner, a turbine impeller air outlet and a turbine impeller blade are arranged on the turbine impeller; separation boards which are arranged according to the circumferential direction are arranged between the turbine impeller air inlet and the turbine impeller air outlet of the turbine impeller; and the turbine impeller air inlet runner is divided into an inner turbine impeller air inlet runner and an outer turbine impeller air inlet runner by the separation boards. According to the dual-zone turbine disclosed by the invention, the supercharging requirement of an engine within the all-condition range can be effectively met; the phenomenon that gas suddenly expands at a single runner air outlet of the volute at low flow can be reduced; and the efficiency of the turbine at low flow can be further increased.

Description

technical field [0001] The invention relates to a novel turbine device, in particular to a dual-zone turbine for turbocharging, which can effectively meet the requirements of low-speed and high-speed supercharging of the engine, and belongs to the field of internal combustion engine supercharging. Background technique [0002] With the gradual improvement of emission standards, turbochargers are widely used in modern engines. In order to meet the performance and emission requirements under all engine operating conditions, especially low-speed operating conditions, the turbocharger must provide higher boost pressure, and has an adjustable function of engine intake pressure and exhaust pressure, and variable section Turbochargers have become the focus of research and development in the field of supercharging. At present, the turbocharger adopts the structure of the double-layer channel variable cross-section turbine volute to meet the requirements of the variable cros...

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that this double-channel variable cross-section turbocharger works in a single channel of the turbine volute under low-speed engine conditions, and the exhaust gas discharged from the engine enters the single channel of the volute from the inlet of the volute to reach Sudden expansion of gas is prone to occur at the outlet of the single channel of the volute, and the gas entering the inlet channel of the turbine wheel from the inlet of the turbine wheel decreases, which reduces the efficiency of the turbine at small flow rates

Under the medium and high-speed working conditions of the engine, the two passages of the turbine volute work together, and the exhaust gas discharged from the engine enters the two passages of the volute from the inlet of the volute and reaches the inlet of the turbine impeller. Mixing, so that part of the kinetic energy of the gas entering the turbine impeller intake channel is converted into potential energy, reducing the efficiency of the turbine

Images