Diesel cycle
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The document summarizes key aspects of diesel engine cycles and their thermodynamics. It discusses: 1) The diesel engine cycle involves isentropic compression, constant pressure heat addition, isentropic expansion, and constant volume heat rejection. This is similar to but distinct from the Otto cycle used in gasoline engines. 2) The thermal efficiency of the diesel cycle depends on the compression ratio and cutoff ratio, with higher efficiencies achieved at higher compression ratios and cutoff ratios closer to 1. 3) Despite sometimes having lower compression ratios, diesel engines are typically more efficient than gasoline engines because they add less heat per cycle, allowing the engine to run at higher speeds to produce the same power output.
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George Brayton designed the first continuous combustion engine, known as the Brayton engine, in the 1860s. The Brayton engine introduced the Brayton cycle of continuous combustion that became the basis for gas turbine development. A Brayton-type engine consists of an air compressor, mixing chamber, and expander. The Brayton cycle uses four thermodynamic processes - two constant pressure and two reversible adiabatic processes - and is now used in gas turbines where compression and expansion occur via rotating machinery.
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The dual cycle is an important part of I mechanical engineering.
here I have to try to derive some of the rules and important parts.
such as,
1.History
2.Comparison Between Otto, Diesel and Dual Cycle
3.Dual Combustion Engine
4.Characteristics
5.Parts Of Engine
6.Stroke
7.Sequence of Operations
8.Expression For Efficiency
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I hope this will help you to get all your required information plz like it and share it.
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Youtube: Harshal Bhatt
Instagram: harshalbhatt_official
Twitter: HarshalBhatt318
Snapchat: harshalbhatt31
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The dual cycle is an important part of I mechanical engineering.
here I have to try to derive some of the rules and important parts.
such as,
1.History
2.Comparison Between Otto, Diesel and Dual Cycle
3.Dual Combustion Engine
4.Characteristics
5.Parts Of Engine
6.Stroke
7.Sequence of Operations
8.Expression For Efficiency
9.Applications
10.Automobile
11.Generators/Aircrafts
12.Marine Engines
I hope this will help you to get all your required information plz like it and share it.
Connect with me on :
Youtube: Harshal Bhatt
Instagram: harshalbhatt_official
Twitter: HarshalBhatt318
Snapchat: harshalbhatt31
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Thank you!
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This document discusses the Diesel and Brayton thermodynamic cycles. It provides details on:
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This document describes several gas power cycles including ideal cycles like the Otto cycle, Diesel cycle, and Brayton cycle as well as actual engine cycles. It provides details on the assumptions and processes of each ideal cycle. The Otto cycle involves four internally reversible processes: isentropic compression, constant-volume heat addition, isentropic expansion, and constant-volume heat rejection. The Diesel cycle also involves four internally reversible processes but with compression ignition. The Brayton cycle is typically used in gas turbines and involves isentropic compression, constant-pressure heat addition, isentropic expansion, and constant-pressure heat rejection. Regeneration and intercooling can improve the efficiency of actual cycles.
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1. The document describes a gas turbine cycle with intercooling between compression stages, regeneration of exhaust heat, and reheating between expansion stages.
2. Key parameters of the cycle include air entering the compressor at 290K and 100kPa and being compressed to 0.41MPa then cooled to 286K before further compression to 0.75MPa.
3. The turbine exhausts at 0.1MPa after expanding down to 0.41MPa at 1350K and being reheated to 1350K before further expansion.
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Ic engine ies gate ias 20 years question and answers
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Diesel cycle
- 1. Sal College Of Engineering Prepared by: Somesh Patani(131130119052)
- 2. Diesel Engine • Also known as Compression Ignition Engine (CI) • Can this engine “knock”? • Difference from Otto Cycle?
- 3. Early CI Engine Cycle and the Thermodynamic Diesel Cycle A I R Combustion Products Fuel injected at TC Intake Stroke Air Air BC Compression Stroke Power Stroke Exhaust Stroke Qin Qout Compression Process Const pressure heat addition Process Expansion Process Const volume heat rejection Process Actual Cycle Diesel Cycle
- 4. Process a b Isentropic compression Process b c Constant pressure heat addition Process c d Isentropic expansion Process d a Constant volume heat rejection - a=1,b=2,etc…for book Air-Standard Diesel cycle rc vc vb v3 v2 (BOOK) Cut-off ratio:
- 5. m VVP m Q uu in 232 23 )()( AIR 23 Constant Pressure Heat Addition now involves heat and work )()( 222333 vPuvPu m Qin )()( 2323 TTchh m Q p in cr v v T T v RT v RT P 2 3 2 3 3 3 2 2 Qin First Law Analysis of Diesel Cycle Equations for processes 12, 41 are the same as those presented for the Otto cycle
- 6. 23 1411 hh uu mQ mQ in out cycle Diesel Diesel const cV 1 1 rk1 1 k rc k 1 rc 1 For cold air-standard the above reduces to: Thermal Efficiency 1 1 1 kOtto r recall, Note the term in the square bracket is always larger than one so for the same compression ratio, r, the Diesel cycle has a lower thermal efficiency than the Otto cycle So why is a Diesel engine usually more efficient?
- 7. Typical CI Engines 15 < r < 20 When rc (= v3/v2)1 the Diesel cycle efficiency approaches the efficiency of the Otto cycle Thermal Efficiency Higher efficiency is obtained by adding less heat per cycle, Qin, run engine at higher speed to get the same power.
- 8. k = 1.3 k = 1.3 The cut-off ratio is not a natural choice for the independent variable a more suitable parameter is the heat input, the two are related by: 1 11 11 1 k in c rVP Q k k r as Qin 0, rc1 MEP Wnet Vmax Vmin - compares performance of engines of the same size
- 9. Thank you…