Spindle Flow Nozzle Convergent Outlet Reduces Sonic Boom
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Solution Overview
Problem
DeLaval nozzles generate excessively divergent airflow, leading to dispersion of jet flow and significant sonic booms at the outlet, which hampers precise delivery and increases noise.
Innovation Solution
A spindle flow type nozzle design featuring a tube body with a middle section and a partition member forming converging and diverging spaces, where the outlet-side inner wall extends at a thickening angle, and a connecting member within the converging space to reduce interference, facilitating concentrated fluid projection and reduced sound intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a DeLaval nozzle with divergent outlet is used, then supersonic jet flow is generated, but the airflow becomes excessively divergent and disperses outward
Solution Approach 1:
The patent inverts the conventional divergent outlet design by implementing a convergent outlet geometry. The outlet-side inner wall extends from the middle section area towards the center point or centerline of the outlet at an outlet-side thickening angle, causing the cross-sectional area to decrease towards the outlet. This inverted approach concentrates the supersonic jet flow rather than allowing it to disperse outward.
Solution Approach 2:
The patent changes the geometric parameters of the outlet section by introducing an outlet-side thickening angle for the outlet-side inner wall. This parameter modification transforms the conventional divergent profile into a convergent profile, fundamentally altering the airflow behavior from dispersion to concentration while maintaining supersonic velocities.
2Speed
If a DeLaval nozzle with divergent outlet is used, then supersonic jet flow is generated, but significant sonic boom is produced at the outlet
Solution Approach 1:
By inverting the outlet geometry from divergent to convergent, the patent reduces the abrupt expansion of supersonic flow that causes strong shock waves and sonic booms. The convergent outlet allows for more gradual flow compression, diminishing the intensity of sonic booms while preserving supersonic jet flow generation.
3Speed
If a conventional DeLaval nozzle is used, then supersonic flow is achieved, but the structure is complex with multiple sections
Solution Approach 1:
The patent merges the converging and diverging spaces into a unified accommodating space within a single tube body. The partition member with its convex bodies creates the necessary flow control within this integrated structure, eliminating the need for separate nozzle sections and reducing overall structural complexity while maintaining supersonic flow capabilities.
4Manufacturing precision
If a partition member with convex bodies is introduced, then flow control is improved, but the device complexity increases
Solution Approach 1:
The partition member is segmented into distinct functional elements: a middle ring area for structural support and two convex bodies for flow control. This segmentation allows each element to perform its specific function efficiently while maintaining manufacturability. The convex bodies create the necessary converging and diverging flow paths without requiring overly complex geometries.
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 spindle flow type nozzle achieves a more concentrated outlet fluid with reduced startup pressure and sonic boom intensity, enabling precise delivery and lower manufacturing complexities compared to traditional DeLaval nozzles.
Implementation Method 1
The DeLaval nozzle, also known as a convergent-divergent nozzle, is capable of converting the thermal energy of the inlet fluid into kinetic energy and generating supersonic jet flow
Implementation Method 2
As the inlet fluid F1 flows from the throat 17 to the diverging space 135, the gas begins to expand, resulting in the jet flow F2 expelled from the outlet 13 having a velocity greater than the speed of sound
Data Source
AI summary
This invention is a spindle flow type nozzle comprising a tube body and a partition member, wherein the partition member is located within an accommodating space of the tube body. The tube body includes an inner wall, an inlet and an outlet, while the partition member includes a middle ring area, a first convex body, and a second convex body. The inner wall connecting to the outlet is defined as an outlet-side inner wall that extends with an outlet-side thickening angle towards the centerline of the outlet or tube body. A converging space is formed between the first convex body and the inlet-side inner wall, while a diverging space is formed between the second convex body and the outlet-side inner wall. A passage is formed between the middle ring area and the inner wall for connecting the converging space and the diverging space.