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Stoddard engine

Elliott J. Stoddard invented and patented two versions of the Stoddard engine, the first in 1919 and the second in 1933. The general engine classification is an external combustion engine with valves and single-phase gaseous working fluid (i.e. a "hot air engine"). The internal working fluid was originally air, although in modern versions, other gases such as helium or hydrogen may be used.

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One potential thermodynamic advantage of using valves is to minimize the adverse effects of "unswept volume" in the heat exchangers (sometimes called "dead volume"), which is known to reduce engine efficiency and power output in the valveless Stirling engine.

The 1919 Stoddard Engine

The generalized thermodynamic processes of the 1919 Stoddard cycle are ^[1]

1. Adiabatic compression
2. Isobaric heat-addition
3. Adiabatic expansion
4. Isobaric heat-removal

The 1933 Stoddard Engine

In the 1933 design ^[2] , Stoddard reduced the internal volume of the heat exchangers.

The generalized thermodynamic processes of the 1933 Stoddard cycle are:

1. Adiabatic compression
2. Isobaric heat-addition
3. Adiabatic expansion
4. Isobaric heat-removal

References

^ 1919 Stoddard Engine US Patent
^ 1933 Stoddard Engine US Patent

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Thermodynamic cycles

Cycles normally with
external combustion

Gas cycles without phasechange - hot air engine cycles	Bell Coleman cycle · Brayton/Joule cycle; (Externally heated) · Carnot cycle · Stirling cycle · Pseudo Stirling cycle is same as Adiabatic Stirling cycle[1] [2] · Ericsson cycle · Stoddard cycle · Ported constant volume cycle[3] · Vuilleumier cycle
Cycles with phasechange	Kalina cycle · Rankine cycle · Regenerative cycle · Two phased Stirling cycle[4]

Cycles normally with
internal combustion

Atkinson cycle · Brayton/Joule cycle · Diesel cycle · Otto cycle · Lenoir cycle · Miller cycle

Cycle mixing

Combined cycle · HEHC cycle[5][6] · Mixed/Dual Cycle

Not categorized

Claude cycle [7] · Fickett-Jacobs cycle · Gifford-McMahon cycle [8] · Hirn cycle · Homogeneous Charge Compression Ignition · Humphrey cycle · Linde-Hampson cycle

Categories: Hot air engines | Cryogenics | Heat pumps

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Stoddard_engine". A list of authors is available in Wikipedia.

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