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THE FEUTEX TOOLKIT

Air-Standard Otto Cycle

Estimate ideal cycle efficiency and compression-end state.

Thermal workspace● Runs in your browser
01 Your input
02 Your result
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FormulaηOtto=1−r^(1−γ); T2=T1 r^(γ−1).
Sources and model references

Worked example

Inputs

Compression volume ratio
8
Heat-capacity ratio
1.4
Intake temperature
300 K
Intake absolute pressure
100000 Pa
Specific heat input
1000000 J/kg

Expected results

Ideal thermal efficiency
0.5647247184
Compression-end temperature
689.219013 K
Specific net work
564724.7184 J/kg
Compression-end absolute pressure
1837917.368 Pa

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter every input in the labeled units; use measured or independently specified properties.
  2. Check the stated model assumptions before calculating.
  3. Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "ratio": 8,
  "gamma": 1.4,
  "temperature": 300,
  "pressure": 100000,
  "heat": 1000000
}

Accuracy and scope

Air-standard constant-property cycle; not a prediction of a real engine fuel economy or combustion temperature. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.