Turbine nozzle ring with adjustable and variable outlet flowing angle

Abstract

The invention relates to a turbine nozzle ring in a turbocharger. Pressurized air flowing out from an outlet manifold bypass of an air compressor of the turbocharger per se and / or compressed air of an external air source (or exhaust fuel gas flowing out from an outlet manifold bypass of an exhaust pipe of an internal-combustion engine) passes through the hollow cavity of a nozzle blade or a hollow interlayer nearby the inner wall of a bladeless volute inlet pipe, and jets and blows a nozzle blade ring or the interior of a bladeless volute runner and / or a main fuel gas flow in a downstream way from a blade profile back (or ventral face) and / or a through-flow slit cut at the tail edge part (a jet deflection arc guide plate is connected to the back of the tail edge slit) or an annular arc through-flow gap at a hollow interlayer outlet nearby the zero-degree section of a bladeless volute tongue tip and the jet deflection arc guide plate connected thereafter, so that the air flow formed by mixing the gap jet flow and the main flow generates flow direction deflection at the outlet of the nozzle ring to cause the change of an outlet airflow angle (namely outlet flowing section area). The turbine nozzle ring has the advantages of high control strength, simple structure, low cost, safety, reliability, high efficiency, convenience for control and applicability for the gasoline engine turbocharger, and the additional air has the functions of additional pressurization and auxiliary energy application.

Description

A turbine nozzle ring with adjustable outlet flow angle technical field The invention relates to the variable section adjustment technology of a turbine nozzle ring in a turbocharger in the technical field of internal combustion engine turbocharging. Background technique The use of variable nozzle ring turbine adjustment technology for turbochargers is an effective measure developed in the past two decades to improve internal combustion engine torque reserve and transient response, and reduce fuel consumption and harmful emissions. By changing the flow cross-sectional area of ​​the outlet of the turbine nozzle ring, a good match between the supercharger and the internal combustion engine can be achieved in the full range of operating conditions. Its function is: when the outlet cross-sectional area of ​​the nozzle ring decreases, the energy of the exhaust gas discharged by the internal combustion engine can be changed to increase the pressure of the turbine inlet gas, the ...

AI Technical Summary

Problems solved by technology

The disadvantages are: ① complex structure, high manufacturing precision, high price, and large volume; ② long-term work in the environment of high temperature and soot, it is difficult to ensure the reliability of the structure and operating system, which will cause the rotor blades to get stuck, seized and die fail

① It is difficult to measure and define the geometric shape and change of the effective flow section of the outlet of the nozzle blade ring, so it is difficult to implement accurate and effective control operations according to the changing working conditions

④ No in-depth and detailed analysis and research on the rationality and effectiveness of the technical scheme of adjusting the flow section of the outlet flow section of the nozzle blade ring cascade by using the air blowing jet to change the nozzle blade ring cascade, and the rationality and effectiveness of the implementation measures, so that the two patent schemes could not be correctly selected. use:

In addition, how to arrange the blowing slots / orifices on the vent / back of the hollow inner cavity blade and the flow channel wall of the top / root end cover plate? How to choose the size of the blowing volume to make the regulation the most economical and effective? It will not produce "the effective flow area of ​​the outlet is reduced" and the "airflow angle of the outlet is increased" as shown in Fig. Adjustment method in which the control effects cancel each other out

And, in order to obtain the adjustment of the increasing direction of the flow cross-sectional area, how should the reasonable arrangement of the blowing slit be implemented? These contents are also all not discussed in JP special open 2003-56406A and FR2284040A two patent schemes, and this must limit their scope of application (particularly in FR2284040A scheme, for the external characteristics high-speed work of vehicle supercharged internal combustion engine In other words, when the boosted air pressure at the outlet of the turbocharger compressor is lower than the gas pressure at the inlet of the nozzle blade ring cascade, the air jet ejection that must rely on the pressure difference between the two cannot be implemented at all)

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