Flow Divider Valve Pressure Equalization for Smooth Nozzle Split Transitions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional flow divider valves in aerospace fuel systems face challenges in smoothly transitioning between flow splits, especially at low flow conditions, leading to disturbances and inefficiencies.
Innovation Solution
A system incorporating an equalization bypass valve, pressure equalization solenoid, and orifice bypass valve to manage flow transitions between equalized and un-equalized modes, using rate limiting orifices and a piston to control pressure differentials and prevent over-pressurization, allowing for faster and disturbance-free flow split changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flow divider valves are used to control flow split between primary and secondary nozzles, then the system can maintain stable operation, but transitions between flow splits cause disturbances especially at low flow conditions
Solution Approach 1:
The equalization bypass valve (EBV) is pre-configured to equalize pressures between primary and secondary conduits before the main flow split transition occurs. This preliminary pressure equalization prevents sudden pressure differentials that cause flow disturbances, allowing smooth transitions while maintaining stable operation.
Solution Approach 2:
The EBV acts as an intermediary mechanism between the primary and secondary flow conduits. By introducing this intermediate pressure equalization stage, the system can transition between flow splits without direct abrupt changes, thereby eliminating disturbances while preserving stable operation.
2Object-affected harmful factors
If rate limiting is applied to control transition speed between flow splits, then disturbances are reduced, but the transition time increases and system responsiveness decreases
Solution Approach 1:
The transition process is segmented into two independent stages: (1) pressure equalization controlled by the EBV with its own rate limiting, and (2) main flow split transition. This segmentation allows each stage to be optimized independently - the EBV handles pressure equalization quickly without causing disturbances, while the main transition follows without excessive delay.
Solution Approach 2:
By performing pressure equalization as a preliminary action before the main flow split transition, the system prepares the pressure conditions in advance. This eliminates the need for slow rate limiting during the main transition, reducing overall transition time while preventing disturbances through the pre-established pressure balance.
3Speed
If the equalization bypass valve opens rapidly to equalize pressures, then transition speed improves, but upstream over-pressurization occurs during high acceleration scenarios
Solution Approach 1:
The EBV incorporates dynamic control through the OBV that adjusts the equalization rate based on real-time pressure conditions. During high acceleration scenarios, the OBV modulates the EBV opening to prevent over-pressurization. This dynamic adjustment maintains fast transition speed under normal conditions while preventing harmful pressure spikes during high acceleration.
Solution Approach 2:
The control system uses pressure feedback to regulate the EBV opening rate. When upstream pressure approaches dangerous levels during high acceleration, the feedback signal adjusts the EBV opening to limit pressure rise. This feedback mechanism enables rapid equalization when safe, while preventing over-pressurization when acceleration is high.
4Stress or pressure
If the orifice bypass valve opens to increase flow during high acceleration, then over-pressurization is prevented, but flow control precision decreases
Solution Approach 1:
The OBV provides localized bypass flow control specifically for high acceleration scenarios where over-pressurization risk exists. The main flow control path remains unchanged and precise, while the OBV adds a localized alternative path only when needed. This local quality approach maintains flow control precision for normal operation while preventing over-pressurization during high acceleration events.
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 faster and more controlled flow split transitions, reducing fuel flow disturbances and preventing upstream over-pressurization, thereby improving the performance of aerospace fuel systems.
Implementation Method 1
The EBV can include a piston that divides flow between the EC and the flow inlet conduit to apportion flow from the flow inlet conduit to the secondary conduit based on a pressure differential between a flow meter pressure at the flow inlet conduit and a pressure in the EC
Implementation Method 2
An EBV rate limiting orifice (RLO) is connected in the PDF conduit. A bypass conduit branches from the PDF conduit on a first side of the EBV RLO and reconnects to the PDF conduit on a second side of the EBV RLO. An orifice bypass valve (OBV) is connected to the bypass conduit. The OBV acts to selectively bypass the EBV RLO.
Implementation Method 3
The EBV is connected to an equalization conduit (EC) to apportion flow from the flow inlet conduit to the secondary conduit
Data Source
AI summary
A system includes a flow inlet conduit and a primary conduit that branches from the flow inlet conduit for delivering flow to a set of primary nozzles. An equalization bypass valve (EBV) connects between the flow inlet conduit and a secondary conduit for delivering flow to a set of secondary nozzles. The EBV is connected to an equalization conduit (EC). A pressure equalization solenoid is connected to the EC to selectively connect a servo supply pressure conduit and/or a return pressure (PDF) conduit into fluid communication with the EC. An EBV rate limiting orifice (RLO) is connected in the PDF conduit. A bypass conduit branches from the PDF conduit on a first side of the EBV RLO and reconnects to the PDF conduit on a second side of the EBV RLO. An orifice bypass valve (OBV) is connected to the bypass conduit and acts to selectively bypass the EBV RLO.