Which of the following cycle is used for spark ignition engine?
It is the standard air cycle used in the spark ignition (SI) engines or petrol engines. Process 4-1: Constant volume heat rejection.
Which of the following cycle is used in compression ignition engine?
What is the process in spark ignition engine?
Where are spark ignition engines used?
How can we increase the thermal efficiency of IC engine?
- Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency. …
- Higher compression ratio. …
- We need new cycles put into practical use. …
- Run the engine at optimum conditions, meaning low friction (modest engine speed) and low pumping work (air throttle more open).
- Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency. …
- Higher compression ratio. …
- We need new cycles put into practical use. …
- Run the engine at optimum conditions, meaning low friction (modest engine speed) and low pumping work (air throttle more open).
Why diesel is not used in petrol engine?
The reason why they use diesel in large vehicles rather than petrol is torque. Diesel has greater compression resistance than gasoline. Because diesel fuel has more compressive resistance than gasoline, diesel engines can be compression-fired engines. Gasoline engines can not.
How is the heat added in the Otto cycle?
In the Otto cycle, there is no heat transfer during the process 1–2 and 3–4 as they are isentropic processes. Heat is supplied only during the constant volume processes 2–3 and heat is rejected only during the constant volume processes 4–1.
What is true about 4 stroke engine?
A four stroke engine delivers one power stroke for every two cycles of the piston (or four piston strokes).
How efficient is a diesel engine?
Modern compression-ignition diesel engines dominate the commercial trucking industry with efficient engines that convert about 43%–44% of fuel energy into engine work, based on 2013–2014 certified engines.
What is brake thermal efficiency?
Brake. thermal efficiency is the ratio of energy in the brake power to. the fuel energy.
How can mechanical efficiency be improved?
- Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency. …
- Higher compression ratio. …
- We need new cycles put into practical use. …
- Run the engine at optimum conditions, meaning low friction (modest engine speed) and low pumping work (air throttle more open).
- Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency. …
- Higher compression ratio. …
- We need new cycles put into practical use. …
- Run the engine at optimum conditions, meaning low friction (modest engine speed) and low pumping work (air throttle more open).
How much of the energy in petrol do petrol engines use?
Only about 12%–30% of the energy from the fuel you put in a conventional vehicle is used to move it down the road, depending on the drive cycle. The rest of the energy is lost to engine and driveline inefficiencies or used to power accessories.
Which engine lasts longer diesel or petrol?
The diesel engine lasts longer than the petrol engine due to the property of the fuel. Diesel is a light volatile fuel, and it also lubricates the engine parts when it burns inside the engine. It results in reduced wear and tear, and hence, a diesel engine lasts longer than a petrol engine.
What is the future of diesel cars?
Our forecast is that diesel will continue as part of the energy mix for many years to come (albeit with a falling market share), but will continue to clean up its act with the latest technology. Future legislation in Europe will impose ever-tougher emissions controls on cars that do burn fuel.
Which of the following gas is used as a working medium in air standard cycle?
The working fluid is air which behaves as an ideal gas. All the processes are internally reversible. Specific heat of air remains constant during the cycle. The combustion process is replaced by the heat addition process.
Which of the following cycle is used for spark ignition engine?
Otto cycle:
It is the standard air cycle used in the spark ignition (SI) engines or petrol engines. Process 4-1: Constant volume heat rejection.
Why is 2 stroke more powerful?
Because combustion takes place with each revolution of the crankshaft with a 2-stroke, this format puts out more power than a 4-stroke engine and the power has more instantaneous delivery. This are some reasons why 2-stroke engines have a long history of use on many different types of motorcycles.
What burns the fuel during power stroke?
In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion. The expansion of the combustion gases pushes the piston during the power stroke.
Why do diesels last longer?
Diesel Fuel
Another reason diesel engines last longer than gas engines is due to the fuel that they burn. Diesel fuel is a type of distillate fuel that is essentially produced from crude oil, which gives diesel engines slower cylinder wear than gasoline engines.
Does diesel burn hotter gas?
Heat Output
As you can see, diesel burns hotter than gasoline and hottest of the three. While gasoline barely surpasses 120,000 BTUs, diesel boasts over 137,000 BTUs per gallon! Kerosene falls a bit short of diesel, burning at almost 132,000 BTUs per gallon.
What is heat balance sheet?
A heat balance sheet is an account of heat supplied and heat utilized in various ways in the system. Necessary information concerning the performance of the engine is obtained from the heat balance. The performance of an engine is generally given by a heat balance sheet.