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Related Concept Videos

Heat Engines01:10

Heat Engines

A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...
The Carnot Cycle01:30

The Carnot Cycle

Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
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Internal Combustion Engine01:20

Internal Combustion Engine

The internal combustion engine is a heat engine that uses the byproducts of combustion as the working fluid instead of using a heat transfer medium to transfer heat. The combustion is done in a way that produces high-pressure combustion products that can be expanded through a turbine or piston to create work. Internal combustion engines can again be categorized into three kinds: (1) spark ignition gasoline engines, most commonly used in automobiles, (2) compression ignition diesel engines that...
Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
The Joule and Joule–Thomson Experiments01:23

The Joule and Joule–Thomson Experiments

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Related Experiment Video

Updated: Jul 20, 2026

A Rapid Method for Modeling a Variable Cycle Engine
04:58

A Rapid Method for Modeling a Variable Cycle Engine

Published on: August 13, 2019

Design and experiment on a mini cascade thermoacoustic engine.

Zhongjun Hu1, Qing Li, Xiujuan Xie

  • 1Technical Institute of Physics and Chemistry, CAS, Beijing, PR China.

Ultrasonics
|September 15, 2006
PubMed
Summary

A miniature thermoacoustic engine was designed and tested, showing good agreement between measured and calculated results. This study advances thermoacoustic engine technology by analyzing acoustic impedance to expand the traveling-wave region.

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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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Last Updated: Jul 20, 2026

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Published on: August 13, 2019

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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Published on: June 1, 2022

Area of Science:

  • Thermodynamics
  • Acoustics
  • Mechanical Engineering

Background:

  • Thermoacoustic engines offer a potential alternative for heat-to-power conversion.
  • Miniaturization of thermoacoustic engines presents unique design and operational challenges.
  • Understanding pressure and temperature distributions is crucial for engine efficiency.

Purpose of the Study:

  • To design and test a miniature cascade thermoacoustic engine.
  • To validate experimental results with theoretical calculations of pressure and temperature fields.
  • To investigate methods for extending the traveling-wave region through acoustic impedance analysis.

Main Methods:

  • Design and construction of a 1-meter long, 500 Hz cascade thermoacoustic engine.
  • Experimental testing to measure acoustic pressure and temperature distributions.
  • Comparison of experimental data with simulation results.
  • Analysis of acoustic impedance to identify strategies for enhancing the traveling-wave regime.

Main Results:

  • Experimental and calculated pressure fields and temperature distributions showed good agreement.
  • The engine achieved a peak-to-peak acoustic pressure of 0.02 MPa.
  • The engine operated at a charged pressure of 1.8 MPa using helium.
  • Acoustic impedance analysis provided insights for extending the traveling-wave region.

Conclusions:

  • The miniature cascade thermoacoustic engine design is validated by experimental results.
  • The study demonstrates the feasibility of achieving significant acoustic pressure in a compact thermoacoustic device.
  • Further research based on acoustic impedance analysis can optimize engine performance by expanding the traveling-wave region.