VTG Cartridge Fixed Separating Blades Pulse Energy
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Solution Overview
Problem
Variable turbine geometry (VTG) turbochargers face inefficiencies due to exhaust gas leakage and mismatched turbine and compressor power requirements, particularly in pulse-separated exhaust systems where individual cylinder pulses are not effectively maintained, leading to reduced turbocharger performance and increased fuel consumption.
Innovation Solution
The integration of at least first and second fixed separating blades between the nozzle ring and disk in a VTG cartridge maintains separation of exhaust gas flows from different cylinders or cylinder groups, enhancing pulse energy utilization and improving turbine efficiency by directing individual pulsations to the turbine wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fixed separating blades are integrated into the VTG cartridge to maintain pulse separation, then turbine efficiency is improved through enhanced pulse energy utilization, but device complexity increases due to additional components and assembly requirements
Solution Approach 1:
The fixed separating blades are integrated directly into the VTG cartridge assembly, merging the pulse separation function with the existing variable geometry mechanism. This combination allows the separating blades to be positioned strategically within the cartridge to maintain exhaust pulse separation while working in conjunction with the movable vanes, thereby reducing energy loss without requiring a completely separate system.
Solution Approach 2:
The cartridge is segmented into distinct functional zones by the fixed separating blades, which divide the exhaust flow paths to maintain pulse separation. This segmentation allows different regions of the cartridge to handle specific cylinder pulses independently, improving energy utilization while the modular segmented structure facilitates manufacturing and assembly.
2Reliability
If the number of separating blades is increased to improve pulse separation, then exhaust gas flow control is improved, but manufacturing cost and assembly difficulty increase
Solution Approach 1:
Rather than uniformly distributing many separating blades throughout the cartridge, the invention applies separating blades selectively at specific locations where pulse separation is most critical. This local quality approach ensures reliable pulse separation is achieved at key interfaces and flow division points, while avoiding the manufacturing complexity of densely populating the entire cartridge with blades.
3Speed
If the VTG cartridge is designed with integrated fixed separating blades, then turbo lag is reduced through improved low-speed response, but the overall system cost increases
Solution Approach 1:
The fixed separating blades are pre-positioned within the cartridge structure to establish exhaust pulse separation before the exhaust gases reach the turbine wheel. This preliminary action of separating and directing pulses in advance ensures that even at low engine speeds, the turbine receives well-organized pulsating flow, reducing turbo lag and improving response time without requiring complex active control mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances turbine efficiency by preserving exhaust gas pulses, reducing turbo lag, and improving engine power output, especially at low speeds, by ensuring that each cylinder's exhaust energy is effectively utilized, leading to better boost pressure characteristics and torque behavior.
Implementation Method 1
at least first and second fixed separating blades (12) are provided between a nozzle ring (6) and a disk (29), the separating blades maintaining separation of exhaust gas flows from different cylinders or cylinder groups
Data Source
AI summary
A cartridge for use in a pulse energy enhanced turbine of a turbocharger. At least first and second fixed separating blades (12) are provided between a nozzle ring (6) and a disk (29), the separating blades (12) maintaining separation of exhaust gas flows through a guide grid between a divided volute and a turbine wheel (11). Exhaust pulsation energy from different cylinders or cylinder groups of an engine or engine bank are kept separated up to the turbine wheel, so that the turbine wheel reacts to individual pulses of exhaust gas flow from engine exhaust ports.