Variable Inlet Guide Vane Turbocharger System
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Solution Overview
Problem
Current turbochargers face limitations in operating range due to surge and choke conditions, which lead to flow instability and decreased efficiency, restricting their ability to provide consistent boost to internal combustion engines.
Innovation Solution
A variable inlet guide vane system (VIGV) that adjusts the inlet cross-sectional area by moving vanes between high-trim and low-trim positions, altering airflow velocity and direction to prevent surge and choke, utilizing an actuator to synchronize vane movement and optimize compressor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inlet cross-sectional area is increased to supply airflow at high velocity, then the compressor can operate at high mass flow rates, but the operating range is limited by surge and choke conditions
Solution Approach 1:
The patent applies a variable inlet guide vane system that dynamically adjusts the inlet cross-sectional area of the compressor based on operating conditions. The vanes can rotate between a high-trim position (maximum area) and low-trim position (minimum area), allowing the system to adapt to different mass flow rates and prevent surge and choke conditions, thereby expanding the stable operating range.
2Reliability
If the inlet cross-sectional area is decreased to prevent surge conditions, then flow stability improves, but the maximum mass flow rate is reduced
Solution Approach 1:
The variable inlet guide vane system allows the compressor to dynamically adjust its inlet area. At low mass flow rates, the vanes rotate to the low-trim position to prevent surge, while at high mass flow rates, they rotate to the high-trim position to maximize productivity. This dynamic adjustment resolves the contradiction between flow stability and mass flow rate.
3Device complexity
If fixed inlet guide vanes are used to simplify the system, then device complexity is reduced, but the operating range and efficiency are limited
Solution Approach 1:
The patent implements a variable inlet guide vane system with an actuator that can rotate the vanes between high-trim and low-trim positions. This adds complexity to the system but significantly expands the operating range and improves efficiency by allowing optimization for different operating conditions, resolving the contradiction between simplicity and adaptability.
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
The VIGV system expands the operating range of the turbocharger, preventing surge and choke conditions, thereby enhancing efficiency and stability, and improving engine power output and fuel consumption.
Implementation Method 1
Each vane is movably disposed within the intake passage between a high-trim position where the casing defines a maximum inlet cross-sectional area for supplying airflow at a high-trim velocity and a low-trim position where the vanes and the casing cooperate with one another to define a minimum inlet cross-sectional area for supplying airflow at a low-trim velocity
Implementation Method 2
The outer section and the inner section are angularly spaced from each other about the transverse axis such that the inner sections provide a circumferential vector of the low-trim velocity
Data Source
AI summary
A variable inlet guide vane system for a turbocharger includes a casing that forms an intake passage along a longitudinal axis. A plurality of vanes extend along corresponding transverse axes that are perpendicular to the longitudinal axis, and each vane is movably disposed within the intake passage between a high-trim position where the intake passage defines a maximum cross-sectional area for supplying airflow at a high-trim velocity and a low-trim position where the vanes define a minimum cross-sectional area for supplying airflow at a low-trim velocity. The minimum cross-sectional area is smaller than the maximum cross-sectional area such that the low-trim velocity is higher than the high-trim velocity at a common flow rate. Each vane includes an outer section rotatably coupled to the casing and an inner section, which extends from the outer section along the transverse axis and is angularly spaced from the outer section about the transverse axis.