Multi-transitional Emitter Flow Exponent Consistency
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Solution Overview
Problem
Drip irrigation systems face challenges in maintaining consistent water flow due to varying exponents along laterals, leading to inaccuracies in system design and pressure adjustments, as the provided singular exponent value does not account for incremental changes in flow rates.
Innovation Solution
The development of a multi-transitional emitter with varying geometric features in pressure reducing sections, allowing for different incremental exponents at different flow rates, which helps in achieving a consistent overall exponent behavior across a range of pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a singular exponent value is used to characterize emitter flow-pressure relationship, then the device complexity is reduced and ease of operation is improved, but the measurement precision and reliability of flow prediction deteriorate due to incremental exponent variations across different flow rates
Solution Approach 1:
The emitter body is segmented into multiple distinct flow passages, each with different geometric characteristics (e.g., different diameters, lengths, or obstruction levels). This segmentation allows each passage to contribute differently to the overall flow-pressure relationship, enabling the composite exponent to remain more constant across varying flow rates compared to a single passage design.
Solution Approach 2:
Different regions of the emitter (different flow passages) are designed with locally optimized geometries to create specific flow resistance characteristics. Each passage has tailored dimensions and features that contribute uniquely to the overall flow behavior, allowing the aggregate system to maintain consistent exponent behavior across the operating range.
2Reliability
If the emitter geometry is made complex with multiple flow passages and varying cross-sections to achieve consistent exponent behavior, then the reliability and precision of flow control are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The complex flow control function is achieved by dividing the emitter into multiple parallel or series flow passages, each with relatively simple individual geometry. This segmentation allows the complex overall behavior to emerge from simpler components, making the device more reliable while managing manufacturing complexity through modular design.
Solution Approach 2:
Multiple flow passages with different geometric characteristics are merged within a single emitter body to achieve the desired consistent exponent behavior. The combined effect of these passages creates a composite flow-pressure relationship that maintains reliability across varying operating conditions.
3Measurement precision
If multiple opposing features with different incremental exponent behaviors are incorporated in the pressure reducing section, then the overall incremental exponent consistency across pressure range is improved, but the manufacturing precision requirements and device complexity increase
Solution Approach 1:
The pressure reducing section is segmented into multiple opposing features (e.g., ridges, protrusions, or constrictions) located at different positions along the flow path. Each feature creates a localized flow resistance with its own incremental exponent characteristics, and their combined effect produces the desired overall consistency, distributing the precision requirements across multiple features rather than demanding extreme precision from a single feature.
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
This solution ensures a more uniform and accurate water distribution by adjusting the emitter's geometry to maintain a consistent incremental exponent, improving the reliability and efficiency of drip irrigation systems.
Implementation Method 1
at least one pressure reducing section interconnecting an inlet section and an outlet section, the at least one pressure reducing section including first opposing features in a first region configured and arranged to provide a first incremental exponent versus flow rate behavior
Implementation Method 2
first opposing features in a first region configured and arranged to provide a first incremental exponent versus flow rate behavior and second opposing features in a second region configured and arranged to provide a second incremental exponent versus flow rate behavior
Data Source
AI summary
An emitter (2200) comprises a floor (2201), a first rail (2204a), and a second rail (2202b) defining at least one pressure reducing section (2208) including first opposing features in a first region to provide a first incremental exponent versus flow rate behavior and second opposing features in a second region to provide a second incremental exponent versus flow rate behavior. The first and second incremental exponent versus flow rate behaviors being different and providing a more consistent overall incremental exponent versus flow rate behavior over a pressure range. The emitter (2200) can be connected to a lateral (2227) having an inner wall (2228), at least a portion of the inner wall (126A, 2228) defining a lateral flow path (2229). The first and second rails (2202A) are operatively connected to the inner wall (2228) and the floor (2201) interconnects distal ends of the first and second rails (2202A). The inner wall (2228), the first and second rails (2202A), and the floor (2201) define an emitter flow path (2229).