Wind Tunnel Nozzle Control for Supercooled Large Drop Icing
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Solution Overview
Problem
Current wind tunnel systems are unable to simulate supercooled large drop icing conditions effectively, as they fail to generate water drops with the necessary two ranges of sizes, which are crucial for accurately testing aircraft sensor systems designed to detect icing conditions.
Innovation Solution
An icing simulation system comprising a wind tunnel, a nozzle system, and a controller that controls various properties such as water pressure, air pressure, and temperature to produce water drops with specific size ranges, including normal and supercooled large drops, to simulate desired icing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current wind tunnel systems are used to simulate icing conditions, then the testing can be performed in a controlled environment, but the system cannot generate water drops with the necessary two ranges of sizes for supercooled large drop icing conditions
Solution Approach 1:
The nozzle system is divided into multiple nozzles with different orifices (e.g., 0.010 inches and 0.030 inches) that spray different drop size ranges. This segmentation allows the system to generate both small drops (0.002-0.010 inches) and large drops (0.010-0.050 inches) simultaneously, achieving the required bimodal drop size distribution for supercooled large drop icing condition simulation
Solution Approach 2:
Different nozzles are positioned at specific locations within the wind tunnel to create localized zones of different drop sizes. The nozzle configuration and positioning are optimized to ensure that both small and large drops are distributed throughout the test section, providing spatial variation in drop size that matches natural icing conditions
2Reliability
If a nozzle system with multiple properties control is implemented to generate specific water drop sizes, then supercooled large drop icing conditions can be simulated, but the device complexity increases
Solution Approach 1:
The system controls multiple parameters including water pressure (e.g., 50-150 psi for small drops, 10-30 psi for large drops), air pressure (e.g., 60-100 psi), and water temperature (e.g., 28-32°F) to achieve the desired drop size distribution. By systematically adjusting these parameters, the system can reliably generate both small and large drops in the required size ranges
Solution Approach 2:
Compressed air is used as an intermediary to atomize the water and control drop formation. The air pressure and flow rate are adjusted to produce different drop sizes from the same nozzle, simplifying the system by using a single nozzle for multiple drop size ranges rather than requiring separate nozzles for each size
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
Enables the simulation of supercooled large drop icing conditions, allowing for the effective testing of aircraft sensor systems and reducing the time and effort required to meet regulatory standards for icing detection, thereby improving the certification process.
Implementation Method 1
The nozzle system is configured to spray drops of water within the wind tunnel
Implementation Method 2
The cooling system is configured to cool air and water to sub-freezing temperatures
Implementation Method 3
water is considered to be supercooled when the water is cooled below the stated freezing point for water but the water is still in a liquid form
Data Source
AI summary
A method and apparatus for an icing simulation system. The icing simulation system comprises a wind tunnel, a nozzle system, and a controller. The nozzle system is configured to spray drops of water within the wind tunnel. The controller is configured to control a number of properties of the water in the nozzle system such that the nozzle system sprays the drops of the water with different sizes for a desired type of icing condition.