Jet Pump Internal Nozzle Segmentation for Compact Design
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Solution Overview
Problem
Existing jet pumps for turbojet engines are difficult to incorporate due to their size and length, which restricts their assembly in the limited annular space defined by the engine housing and cowl, necessitating a more compact design.
Innovation Solution
A collector with a convergent duct and a seamless propulsion fluid supply tube featuring multiple distribution openings, which increases the cross-sectional area for propulsion fluid passage without enlarging the collector, resulting in a more compact and lightweight jet pump design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a traditional single-opening distribution tube is used, then the structure is simple, but the cross-sectional area for propulsion fluid passage is limited, requiring a larger and longer collector
Solution Approach 1:
The single distribution opening is segmented into multiple distribution openings along the inner portion of the tube. This segmentation increases the total cross-sectional area for propulsion fluid passage while keeping the tube dimensions compact, thereby increasing the quantity of propulsion fluid that can be distributed without enlarging the collector volume.
Solution Approach 2:
The distribution openings are arranged along the length of the inner tube portion rather than concentrating the flow through a single opening. This dimensional redistribution of flow paths increases the effective cross-sectional area for fluid passage while maintaining a compact tube structure.
2Quantity of substance
If a larger collector is used to accommodate sufficient propulsion fluid flow, then the fluid passage capacity is adequate, but the pump becomes too large to fit in the annular space between engine housing and cowl
Solution Approach 1:
The propulsion fluid distribution is segmented into multiple openings along the tube, allowing the same flow capacity to be achieved in a more compact and distributed manner along the tube length rather than requiring a large single-opening collector.
Solution Approach 2:
The configuration of the distribution openings (number, size, spacing, orientation) is optimized to achieve the required propulsion fluid flow capacity within a compact collector geometry that fits the annular space constraints.
3Length of stationary object
If the collector diameter is reduced to fit in the annular space, then the assembly is more compact, but the pressure losses increase due to restricted flow paths
Solution Approach 1:
The multiple distribution openings segment the flow path, allowing propulsion fluid to be distributed at multiple locations along the tube. This segmentation reduces flow velocity at each opening and minimizes pressure losses while maintaining compact collector dimensions.
Solution Approach 2:
The distribution openings are strategically positioned and sized to optimize local flow characteristics, ensuring adequate pressure and flow distribution to different regions of the collector while minimizing overall pressure losses in the compact geometry.
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 minimizes pressure losses and allows for a more compact and lightweight jet pump, facilitating easier assembly and integration with engine components by reducing the diameter and length of the pump.
Implementation Method 1
the propulsion fluid entrains the withdrawn fluid by the Venturi effect downstream of the distribution opening 9, so that the expansion of this propulsion fluid supplies the withdrawn fluid with the necessary energy for its entrainment in order to propel it
Data Source
AI summary
The invention relates to a jet pump collector comprising a convergent duct extending along the longitudinal axis (AX) and comprising an intake opening for a fluid to be withdrawn, this convergent duct having a restriction shape terminated by a reduced end having a smaller cross-section than its intake opening. This convergent duct is equipped with a tube (17) orientated perpendicular to the longitudinal axis longitudinal (AX), this tube (17) comprising an outer portion extending outside of the convergent duct and being terminated by an intake opening (31) for a propulsion fluid, and an inner portion extending in the convergent duct and comprising a plurality of distribution openings (18, 19) for the propulsion fluid which are orientated towards the reduced end.