Convergent-Divergent Nozzle Profiles for Sound Boosting and Silencing
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Solution Overview
Problem
Existing methods for amplifying or suppressing sound loudness are inefficient due to high concomitant turbulence in the ambient fluid, leading to low net-efficiency in sound launching and detection, with significant power dissipation into heat.
Innovation Solution
A specifically shaped convergent-divergent jet-nozzle is used as a sound-booster or sound-silencer, employing a varying cross-sectional area profile to reduce turbulent motion and transform fluid heat energy into sound wave power, or vice versa, using equations like AHORN(x) = AIN*MHORN(x)*(2+γ*MHORN(x))^2/(γ+1)*(γ-1)/(γ+12) for sound-booster and ASILENCER(x) = A*SILENCER*(γ-1)/γ*(2+γ*MSILENCER(x))^2/(γ+1)*(γ-1) for sound-silencer configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional methods are used for sound amplification and suppression, then sound power can be transmitted, but turbulent dissipation causes low net-efficiency with significant power loss as kinetic energy in turbulence
Solution Approach 1:
The patent applies parameter changes by modifying the flow velocity parameters through specifically shaped convergent-divergent nozzles. The nozzle geometry transforms the velocity distribution of the ambient fluid flow, creating regions of accelerated and decelerated flow that interact with sound waves to reduce turbulent dissipation and improve net-efficiency of sound transmission.
Solution Approach 2:
The patent replaces conventional passive acoustic systems with an active fluid dynamic system. By introducing a controlled jet flow through shaped nozzles, the system uses fluid mechanical effects (jet-effect, de Laval effect) to actively manage turbulent dissipation and enhance sound wave propagation, substituting traditional acoustic amplification methods.
2Power
If a passive sound transformer is designed to amplify sound, then sound intensity increases, but device complexity increases due to specifically shaped nozzles and varying cross-sectional area profiles
Solution Approach 1:
The patent employs parameter changes through mathematically defined cross-sectional area profiles A(x) that vary along the nozzle length. These profiles, characterized by specific functions with parameters like α, β, and L, allow systematic control of flow velocity and pressure distributions to optimize sound amplification while providing a structured approach to managing geometric complexity.
Solution Approach 2:
The patent applies dynamics by using varying cross-sectional area profiles that create dynamic flow conditions within the nozzle. The changing geometry induces corresponding changes in flow velocity, pressure, and density parameters along the nozzle length, enabling the system to adaptively transform sound waves through controlled fluid dynamic interactions.
3Power
If convergent-divergent nozzle geometry is used to enhance de Laval jet-effect, then sound amplification improves, but manufacturing precision requirements increase due to specific area profile specifications
Solution Approach 1:
The patent uses parameter changes with mathematically explicit area profile functions that define the nozzle geometry. By specifying profiles through equations with controllable parameters (such as power-law profiles A(x) = A0*(x/L)^α), the design provides a systematic method to achieve desired acoustic performance while offering flexibility in manufacturing tolerances through parameter optimization.
Solution Approach 2:
The patent applies partial action by implementing convergent-divergent nozzle sections only where specifically needed for sound amplification, rather than requiring precision throughout the entire device. The varying area profiles are concentrated in critical regions to generate the necessary jet-effect, allowing less stringent manufacturing tolerances in non-critical sections.
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 solution effectively amplifies sound loudness by transforming fluid heat and turbulence energy into sound wave power or dissipates sound energy into heat, improving net-efficiency and reducing unwanted turbulence, thereby enhancing sound detection and propagation.
Implementation Method 1
employing a varying cross-sectional area profile to enhance the de Laval jet-effect or retarding-effect, transforming fluid heat and turbulence energy into sound energy
Implementation Method 2
a diversity of manifestations of the Venturi effect and the de Laval jet-effect, both resulting in a phenomenon of convective self-acceleration
Implementation Method 3
employing a varying cross-sectional area profile to enhance the de Laval jet-effect or retarding-effect, transforming fluid heat and turbulence energy into sound energy or dissipating sound waves into heat
Implementation Method 4
reducing turbulent dissipation, increasing net-efficiency of sound launching and detection
Data Source
AI summary
The invention discloses a novel passive sound transformer, either a sound-booster or a sound-silencer, embodied as an acoustic waveguide, a specific shape of which provides for either amplifying the intensity of acoustic waves at the expense of both the heat energy and the concomitant turbulence of moving fluid wherein the amplified intensity of the acoustic waves is manifested as sound loudness boosting or, contrarywise, transforming the wave power of elastic waves into the heat of the ambient fluid.