Variable Diameter Piccolo Tube for Uniform Nacelle Anti-Icing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing anti-icing systems for aircraft nacelles are inefficient in maintaining uniform temperature and flow rates across the circumference, leading to inconsistent ice prevention and increased risk of ice build-up.
Innovation Solution
A variable diameter piccolo tube with a plurality of openings is designed, featuring a first cross-sectional diameter at the inlet and a second, smaller diameter at a distal point 180° away, with consistent opening areas to ensure equal mass flow rates and pressure distribution, preventing ice accumulation on the nacelle inlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a traditional uniform diameter piccolo tube is used, then the structure is simple and easy to manufacture, but the temperature distribution is non-uniform and ice prevention is inconsistent
Solution Approach 1:
The piccolo tube employs varying diameters at different locations along its length. The tube has a larger diameter at the inlet end and a smaller diameter at the outlet end, creating local quality variations that result in uniform mass flow rates and consistent impingement flow patterns across all openings, thereby achieving uniform temperature distribution and effective ice prevention.
Solution Approach 2:
The invention changes the geometric parameter (diameter) of the piccolo tube along its length. By progressively reducing the diameter from inlet to outlet, the mass flow rate through each opening is equalized, which directly addresses the temperature distribution uniformity issue while maintaining a relatively simple tubular structure.
2Reliability
If a variable diameter piccolo tube is used, then uniform mass flow rate and pressure distribution are achieved, but manufacturing complexity increases
Solution Approach 1:
The piccolo tube employs varying diameters at different locations along its length. The tube has a larger diameter at the inlet end and a smaller diameter at the outlet end, creating local quality variations that result in uniform mass flow rates and consistent impingement flow patterns across all openings, thereby achieving uniform temperature distribution and effective ice prevention.
Solution Approach 2:
The invention changes the geometric parameter (diameter) of the piccolo tube along its length. By progressively reducing the diameter from inlet to outlet, the mass flow rate through each opening is equalized, which directly addresses the temperature distribution uniformity issue while maintaining a relatively simple tubular structure.
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 solution achieves uniform temperature distribution and enhanced anti-icing effectiveness by maintaining consistent impingement flow rates across the circumference, effectively reducing ice build-up on the nacelle inlet.
Implementation Method 1
maintaining consistent impingement flow rates across the circumference, effectively reducing ice build-up on the nacelle inlet
Implementation Method 2
maintaining consistent impingement flow rates across the circumference
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A piccolo tube (152) for an anti-icing system may comprise an annular tube (156) and a plurality of openings (154) formed along a circumference of the annular tube. The annular tube may comprise a first cross-sectional diameter (D1) at an inlet point (160) and a second cross-sectional diameter (D2) at a distal point (162). The second cross-sectional diameter is less than first cross-sectional diameter. The distal point may be 180° from the inlet point.