Otto Cycle of Internal Combustion Engines, Gamma vs Compression Ratio, Adiabatic Processes - Physics

This physics video tutorial provides a basic introduction into the otto cycle of an internal combustion engine. The first step is an adiabatic process when the gas undergoes compression. As the volume decreases, the temperature of the gas increases and the pressure greatly increases favoring ignition. The second step is an isochoric process which causes a further increase in pressure. Heat is added in this step but no work is done. The third step is an adiabatic expansion - no heat is transferred but the gas performs work on the surroundings as it expands. The final step is an isochoric process where the pressure decreases. This video also contains a few practice problems on calculating the compression ratio, the gamma ratio, and the efficiency of the internal combustion engine as well as the molar heat capacity of the working substance at constant volume and at constant pressure. This thermodynamics video tutorial contains plenty of examples and practice problems.

Open Vs Closed Vs Isolated System:

First Law of Thermodynamics:

Isobaric Process:

Isochoric Process:

Isothermal Process:

Internal Energy of an Ideal Gas:

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Adiabatic Process:

PV Diagrams:

Thermodynamics Review:

2nd Law of Thermodynamics:

Heat Engines:

Converting Heat Into Electricity:

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Carnot Cycle:

Refrigerators and Heat Pumps:

Entropy:

Heat Engines and Refrigerators Review:

Physics PDF Worksheets:

[oladelerasheed]

All rounder...this man should be given an genius per excellence

[seraphin]

we need more internal combustion engine problems, there's too little results to see when searching for them. thank you for your hard work :>

[solomonglenda]

Why is there no video on Diesel Cycles? 😭😭

[trendingswahili]

Mhhh you are a great and great of all time.... Please don't stop 🛑

[enderslayer]

The greatest teacher ever walk on the planet yes

[musarapio_hha]

i have a question following the otto cycle you can reemplace the "terms", and calculate lets say the point at PC
using the same formula???
min 22:09 of the video

pc= pb (tc/tb) * r

[amirachennouf]

Is this the same as the one called 'Beau de Rochas cycle' ?

[vaishnavipal]

Cv is molar heat capacity at constant volume, during A to B the process is compression, volume does change, but you said that work done is always n*Cv*delta(T) (that's true) but aren't these 2 things contradictory to each other?

[squeecy]

How might throttle and mixture(fuel/air ratio) play into all of this?

[ZaydEdits]

for delta u = n*CV*deltaT, what is n? Is it the number of moles in the specific mass of the substance?

[jaswanthreddy]

I am having exam on thermodynamics ...so plz help me sir

[ra]

If the theoritical efficiency of an internal combustion engine with so low pressure ratio is so high (over 50% for under 9) why cars' enginees are so inefficient and need so big amounts of fuel in order to produce mechanichal work?
Why engine producers strugle with more high pressure ratio and more low lamda ratio in order to make them more efficient?
I think about mabe if the real gamma ratio is in reality lower than 1, 4 so that's why the efficiency is pretty low, and with a research and study on the theme i thing that brcause of the flown composistion for lamba =1 the real gamna is around 1.15, i calculated so.

[jtb]

The processes that you mentioned at 9:02 are not isochoric, the volume changes during that process.

[naeem]

Holy fu** you're teaching Internal Combustion Engine now?!!

[jaswanthreddy]

Sir I want solution for this sum ""an otto cycle takes in air at 300k the ratio of maximum to minimum temperature is 6 .find out the optimum compression ratio for maximum output of the cycle."""