Studying engines Isothermal expansion adiabatic expansion isothermal compression and adiabatic compression?

Question

Hello,

I am studying engines. Unfortunately, Im having trouble understanding the concepts of Isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression. These are very important concepts. Can someone explain them too me with an example of how they apply to the 4 cycle (otto) engine? Thank you.

Answer 1

These are thermodynamics concepts. Wiki has articles on all of them. Read thru one at a time, and don't get discouraged. Can also Google various terms.

Iso means same, so isothermal is constant temp.

Adiabatic means no heat transfer.

When you compress or expand a gas, the temperature changes, which is calculated for an ideal gas as: PV=mRT.

P = pressure, V = volume, m = mass of gas, R is a constant you can google, T is temperature (absolute, i.e. Kelvin or Rankine, not Celsius or Fahrenheit).

thermodynamics gas.

For real gases (i.e. over 200 psi or so), add Z, a compressibility factor.

Answer 2

'Joseph Papp' presented patent and working model: composed of three gasses ignited and recovered enough to not need refueling.An electromatic magnet provides the needed charges.The way the writers expressed the gas mix was doing its thing 'inside a glass catheter.Good luck and don't look back.