Variable Inlet Device Semi-Cylindrical Shells Compressor Flow
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Solution Overview
Problem
Existing compressor systems with adjustable inlet guide vanes suffer from reduced efficiency at high engine loads due to flow restriction, even in the open position, and experience increased turbocharger lag and fuel consumption at low engine loads, limiting boost pressure rise at low speeds.
Innovation Solution
A variable inlet device (VID) comprising semi-cylindrical shells pivotable about hinges within the compressor's inlet conduit, adjusting between open and closed positions to minimize or maximize flow restriction based on engine load and speed, optimizing airflow and efficiency across a range of operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional adjustable inlet guide vanes are used, then flow can be restricted at low loads to prevent surge, but flow is still restricted at high loads reducing compressor efficiency
Solution Approach 1:
The inlet guide vanes are divided into multiple independent segments that can be controlled separately. This allows different portions of the airflow to be restricted or opened independently, enabling surge prevention at low loads while maintaining high flow capacity at high loads, thus resolving the contradiction between reliability and productivity.
Solution Approach 2:
The inlet guide vanes transition from a static or uniformly adjustable configuration to a dynamic multi-position system. The vanes can be positioned in multiple discrete locations (fully open, partially open, fully closed) based on operating conditions, allowing the system to adapt behavior to match the contradiction requirements across different load ranges.
2Productivity
If inlet guide vanes are positioned to maximize flow, then high end efficiency improves, but flow restriction occurs at low loads causing increased turbocharger lag
Solution Approach 1:
The system dynamically adjusts the inlet guide vane positions based on engine operating conditions. At high loads, vanes are positioned to maximize flow and efficiency. At low loads, vanes are positioned to restrict flow and prevent surge, eliminating turbocharger lag. This dynamic adaptation resolves the contradiction between productivity and time loss.
Solution Approach 2:
The system changes the geometric parameters of the inlet flow passage by adjusting vane positions. Different vane angles and opening areas are selected based on operating conditions, optimizing the balance between flow capacity and surge prevention to resolve the contradiction between high end efficiency and transient response.
3Device complexity
If fixed inlet guide vanes are used, then device complexity is minimized, but compressor efficiency is reduced across all operating conditions
Solution Approach 1:
The inlet guide vane assembly is segmented into multiple independently controllable sections. This segmentation enables the system to achieve variable geometry functionality without requiring a completely complex mechanism, as each segment can be adjusted independently to optimize efficiency at different operating points.
Solution Approach 2:
The system introduces dynamic adjustability to the inlet guide vanes, allowing them to change position based on operating conditions. This dynamic capability significantly improves compressor efficiency across the operating range while the mechanism complexity remains manageable through modular design and controlled actuation of individual vane segments.
Data Source
AI summary
Methods and systems are provided for a variable inlet device of a compressor. In one example, a compressor may include the variable inlet device arranged within an inlet conduit of the compressor. The variable inlet device may be adjustable to control the gas flow through the compressor, the variable inlet including a pair of semi-cylindrical shells that are pivotable, about a set of hinges, between an open and closed position.