SMA Flow Control Nozzle for Temperature-Compensated Constant Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluid flow control devices, such as jet pipe servo valves and fuel control nozzles, are susceptible to performance degradation due to temperature-induced changes in fluid viscosity, leading to fluctuations in flow rate.
Innovation Solution
A flow control nozzle utilizing a deformable Shape Memory Alloy (SMA) material that adjusts its flow area in response to temperature changes, maintaining a constant flow rate by reducing the flow area as temperature increases, thereby compensating for viscosity variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed flow area nozzle is used, then the结构简单 (structure is simple), but the flow rate varies with temperature due to viscosity changes
Solution Approach 1:
The nozzle transitions from a fixed structure to a dynamic structure where the flow area can automatically adjust. The deformable element changes its shape in response to temperature variations, allowing the nozzle to adapt its flow area dynamically to compensate for viscosity changes and maintain stable flow rate.
Solution Approach 2:
The invention changes the physical parameter of the nozzle structure by introducing a deformable element that alters the flow area. This parameter change allows the system to compensate for temperature-induced viscosity variations, resolving the contradiction between structural simplicity and flow stability.
2Reliability
If the flow area is reduced to compensate for viscosity decrease at high temperature, then the flow rate stability improves, but the nozzle structure becomes more complex
Solution Approach 1:
The deformable element in the nozzle performs self-adjustment based on temperature changes without requiring external control systems. The material's inherent properties enable it to automatically reduce the flow area when temperature increases, achieving flow compensation through self-service functionality.
Solution Approach 2:
The deformable element utilizes phase transition or shape memory effects to change its configuration in response to temperature. This allows the nozzle to automatically adjust its flow area through material property changes rather than mechanical actuation, balancing complexity with performance.
3Adaptability or versatility
If a deformable element is added to the nozzle, then the flow compensation capability improves, but the manufacturing complexity increases
Solution Approach 1:
The nozzle incorporates composite construction combining rigid structural components with a deformable element made of temperature-responsive material. This composite approach enables the nozzle to achieve temperature compensation functionality while maintaining manufacturability through the integration of specialized materials with established fabrication processes.
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 SMA-based flow control nozzle dynamically maintains a substantially constant flow rate across a range of operating temperatures, ensuring consistent performance despite temperature fluctuations.
Implementation Method 1
a deformable element comprising a shaped memory alloy (SMA) material wherein within a range of operating temperatures the SMA material is configured to reduce the flow area of the flow control nozzle as the operating temperature increases
Data Source
AI summary
There is disclosed a flow control nozzle for controlling the flow of an incompressible fluid, the flow control nozzle having a flow area and comprising a deformable element comprising a shaped memory alloy (SMA) material wherein within a range of operating temperatures the SMA material is configured to reduce the flow area of the flow control nozzle as the operating temperature increases. The flow control nozzle is thus able to dynamically compensate for changes in operating temperature in order to maintain a constant flow.