Mechanical Engineering - IC Engines and Nuclear Power Plants - Discussion
Discussion Forum : IC Engines and Nuclear Power Plants - Section 1 (Q.No. 44)
44.
The thermal efficiency of diesel engines on weak mixtures is
Discussion:
20 comments Page 1 of 2.
Ibrahim Mollah said:
3 years ago
Unaffected is the correct answer.
Rahul Maurya said:
5 years ago
The thermal efficiency of diesel engines on weak mixtures is higher. Compression-ignition engines are more fuel efficient (upto 30%) than their gasoline counterparts. Diesel has more long chain hydrocarbons, which is 15 percent more energy dense than gasoline.
Barad divyesh said:
5 years ago
I think efficiency should be decreased because of weak mixer required input is high so efficiency decreased,
Effi. = output/input.
Effi. = output/input.
Sawid said:
5 years ago
Lean mixture means low HC, leads to better fuel economy. So in a way it will have a better thermal efficiency but lower work output.
MOhit said:
6 years ago
Diesel engines make heterogeneous mixture with air that's why if fuel-air ratio is rich or stoichiometric then complete fuel will not enough oxygen for combustion hence poor thermal efficiency.
Therefore, Diesel engines are always run at leaner mixture also called weak mixture.
If mixture is more leaner then efficiency will again decreases. It is maximum at the little leaner mixture.
Therefore, Diesel engines are always run at leaner mixture also called weak mixture.
If mixture is more leaner then efficiency will again decreases. It is maximum at the little leaner mixture.
(1)
Shiva said:
7 years ago
Please give the explanation of the correct answer.
Getnet said:
7 years ago
Weak (lean) mixture means low fuel-air ratio, since the fuel is completly burned by oxygen. So the thermal efficincy is max but not work out put (efectivness is not good).
S Bera said:
8 years ago
So according to above discussion, we can say, weak mixture gives less amount fuel. High pressure required to complete the combustion, high temperature induced. Thermal efficiency is increased.
Lalu said:
8 years ago
Weak mixture gets complete combustion.
Ankush said:
9 years ago
Weak mixture means less fuel and high amount of air, hence proper use of fuel leads to high thermal efficiency.
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