Otto Cycle to Diesel Cycle P M V Subbarao Professor Mechanical Engineering Department Creation of Religious Engines…

Clue to Achieve Higher Efficiency

Hardware Feasibility of Otto Cycle Net cycle work: Piston Displacement volume Work done per unit piston displacement volume:

Measure of Size & Feasibility P V2V2 V1V1 Q in W cycle AIR

The net cycle work of an engine can be increased by either: i) Increasing the r (1  2’) P V2V2 V1V1 Q in W cycle Factors Affecting Work per Cycle (i) 2’ 3’ C (ii) 4’’ 3’’ ii) Increase Q in (2  3”) 4’ C

Creation of Compact Engines Using Otto Cycle (200 CC) rvrv MEP, MPa Q in = 100J/cycle) Q in = 200J/cycle) Q in = 500J/cycle)

The Historical Event in Automobiles In 1893, the Benz Velo became the world's first inexpensive, mass-produced car unites were produced. 0.7 hp and 958cc!!! The Mercedes 35 HP (German: Mercedes 35 PS) was a radical early car model designed in Engine volume: 5,918CC. The racecar was of a disappointing performance by multiple technical complications and enduring just for few laps.

SI Engine for Propulsion

Thermo-chemical Feasibility Fuel/Air Mixture Compression Stroke

Engine Damage From Severe Knock Damage to the engine is caused by a combination of high temperature and high pressure. Piston Piston crown Cylinder head gasket Aluminum cylinder head

Critical Compression Ratio FormulaName Critical r CH 4 Methane12.6 C 3 H 8 Propane12.2 C 8 H 18 Isooctane 7.3

History of Wildfires ,000,000 acres Miramichi Fire New Brunswick Killed 160 people ,000 acres Yaquina FireOregon ,000,000 acres Silverton FireOregon Worst recorded fire in state's history ,000 acres Saguenay FireQuebec ,200,000 acres Peshtigo FireWisconsin Killed over 1,700 people and has distinction of the conflagration that caused the most deaths by fire in United States history. It was overshadowed by the Great Chicago Fire that occurred on the same day.Great Chicago Fire

Generalized Flammability Map

Design Constraints: Flammability Characteristics Mixture Temperature Stoichiometric Line Flammable Vapour Spontaneous Ignition Lean Mixture Line Rich Mixture Flammable mist Flash Point Burning Impossible Inflammable mist

Inflammability of Fuels

Spontaneous (Auto) Ignition Temperature of Fules Fuel SIT,  C Petrol Diesel210 Kerosene295 Natural Gas580 Hydrogen500 Iso-Octane447 Iso-Butane462

Rudolf Christian Karl Diesel Diesel published a treatise entitled, Theory and Construction of a Rational Heat- engine to Replace the Steam Engine and Combustion Engines Known Today. This formed the basis for his work on and invention of, the diesel engine. In his engine, fuel was injected at the end of compression and the fuel was ignited by the high temperature resulting from compression.