Rocket Engine Exit Manifold Flow Guide Design
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Solution Overview
Problem
In rocket engines, the collision of coolant flows from different directions into a toroidal exit manifold creates a high pressure stagnation region, reducing flow rates and increasing pumping pressures due to uneven pressure distribution.
Innovation Solution
The exit manifold design includes a flow guide that redirects coolant flows from opposing directions to align parallel with the discharge port, minimizing collisions and pressure losses by incorporating a feature that changes the flow direction towards the axis of the discharge port, thereby reducing the formation of high pressure stagnation regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If coolant flows from multiple inlets in opposite directions towards a common discharge port, then the coolant can be collected from all tubes or passages, but a high pressure stagnation region forms that reduces flow rates and increases pumping pressure
Solution Approach 1:
The patent introduces asymmetric flow guidance within the manifold. Specifically, flow guides or baffles are positioned to redirect coolant from one inlet group in a direction that avoids direct collision with opposing flows. This asymmetric intervention creates preferential flow paths that eliminate the symmetric collision pattern causing the stagnation region, thereby reducing pumping pressure while maintaining coolant collection from all tubes or passages
Solution Approach 2:
The patent employs flow guides or baffles as intermediary elements within the manifold. These intermediaries actively redirect the coolant flows from opposing inlets, preventing direct collision and the formation of high pressure stagnation regions. The flow guides serve as mediators that reshape the flow patterns, creating smoother transitions and reducing pressure losses without requiring changes to the inlet or outlet configurations
2Volume of moving object
If coolant flows turn ninety degrees in the exit manifold, then the manifold can be compact, but pressure losses increase and pumping pressure must be increased
Solution Approach 1:
The patent replaces sharp ninety-degree turns with curved flow paths within the manifold. By incorporating curved surfaces and gradual transitions instead of abrupt angular changes, the flow guides smoothly redirect coolant from radial or axial directions to circumferential flow toward the discharge port. This curvature reduces flow separation and turbulence, minimizing pressure losses while maintaining a compact manifold geometry
3Productivity
If inlets direct flows in opposite directions, then all tubes or passages can be serviced, but uniform flow distribution is reduced due to pressure non-uniformity in the manifold
Solution Approach 1:
The patent applies different flow guidance strategies to different regions of the manifold. Flow guides are strategically positioned to address local flow patterns and pressure distribution characteristics in various sections. By tailoring the flow redirection approach to specific local conditions rather than applying a uniform solution throughout, the system achieves more uniform flow distribution from all tubes or passages while managing the opposing flow directions
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 design enhances coolant flow rates through the manifold, reduces pumping pressures, and optimizes engine performance by minimizing pressure losses and ensuring uniform flow distribution.
Implementation Method 1
The at least one flow guide is configured to change the at least one first direction of the flow towards the axis of the discharge port
Data Source
AI summary
An exit manifold is disclosed which includes a manifold body that includes a plurality of inlets. The manifold body provides communication between the inlets and a discharge port. At least one of the inlets directs flow in a first direction and at least one of the inlets directs flow in a second direction. The first and second directions are opposite and the material flowing in these opposite directions collides in front of the discharge outlet. The collision of these two oppositely-directed flows creates a high pressure stagnation region that may block or impede flow from one or more inlets that may be in alignment with the discharge port.