Octane Number and Cetane Number Notes | Engineering Chemistry | RGPV BTech First Year

Octane Number and Cetane Number Notes | Engineering Chemistry | RGPV BTech First Year


Octane Number and Cetane Number

Engineering Chemistry рдореЗрдВ Liquid Fuels рдХреА Quality рдХреЛ рдорд╛рдкрдиреЗ рдХреЗ рд▓рд┐рдП Octane Number рддрдерд╛ Cetane Number рдХрд╛ рдЙрдкрдпреЛрдЧ рдХрд┐рдпрд╛ рдЬрд╛рддрд╛ рд╣реИред Octane Number Petrol рдХреА Anti-Knocking Property рдХреЛ рджрд░реНрд╢рд╛рддрд╛ рд╣реИ рдЬрдмрдХрд┐ Cetane Number Diesel Fuel рдХреА Ignition Quality рдХреЛ рд╡реНрдпрдХреНрдд рдХрд░рддрд╛ рд╣реИред Automobile Engineering, Fuel Technology рддрдерд╛ Internal Combustion Engines рдореЗрдВ рдЗрди рджреЛрдиреЛрдВ Parameters рдХрд╛ рдЕрддреНрдпрдзрд┐рдХ рдорд╣рддреНрд╡ рд╣реИред


ЁЯФ╣ Knocking рдХреНрдпрд╛ рд╣реИ?

Internal Combustion Engine рдореЗрдВ Fuel-Air Mixture рдХреЗ рдЕрд╕рд╛рдорд╛рдиреНрдп рдПрд╡рдВ рдЕрдирд┐рдпрдВрддреНрд░рд┐рдд рджрд╣рди рдХреЗ рдХрд╛рд░рдг рдЙрддреНрдкрдиреНрди рдзрд╛рддреНрд╡рд┐рдХ рдЖрд╡рд╛рдЬ рдХреЛ Knocking рдХрд╣рддреЗ рд╣реИрдВред

Knocking Engine Efficiency рдХреЛ рдХрдо рдХрд░рддрд╛ рд╣реИ рддрдерд╛ Engine Parts рдХреЛ рдиреБрдХрд╕рд╛рди рдкрд╣реБрдВрдЪрд╛рддрд╛ рд╣реИред


ЁЯФ╣ Octane Number рдХреНрдпрд╛ рд╣реИ?

Octane Number Petrol Fuel рдХреА Anti-Knocking Quality рдХрд╛ рдорд╛рдк рд╣реИред

рдпрд╣ рдмрддрд╛рддрд╛ рд╣реИ рдХрд┐ Petrol Fuel Spark Ignition Engine рдореЗрдВ Knocking рдХрд╛ рдХрд┐рддрдирд╛ рдкреНрд░рддрд┐рд░реЛрдз рдХрд░рддрд╛ рд╣реИред


ЁЯФ╣ Definition of Octane Number

"Octane Number is the percentage by volume of Iso-Octane present in a mixture of Iso-Octane and n-Heptane having the same knocking characteristics as the fuel under test."


ЁЯФ╣ Reference Fuels for Octane Number

Reference Fuel Octane Value
Iso-Octane 100
n-Heptane 0

ЁЯФ╣ Example of Octane Number

рдпрджрд┐ рдХрд┐рд╕реА Petrol рдХрд╛ Octane Number 80 рд╣реИ, рддреЛ рдЙрд╕рдХреА Anti-Knocking Property 80% Iso-Octane рддрдерд╛ 20% n-Heptane рдХреЗ рдорд┐рд╢реНрд░рдг рдХреЗ рдмрд░рд╛рдмрд░ рд╣реЛрдЧреАред


ЁЯФ╣ Importance of Octane Number

  • Indicates Fuel Quality
  • Measures Anti-Knocking Property
  • Improves Engine Efficiency
  • Prevents Engine Damage
  • Enhances Performance

ЁЯФ╣ Factors Affecting Octane Number

  • Molecular Structure
  • Branching of Hydrocarbons
  • Aromatic Content
  • Additives Used
  • Fuel Composition

ЁЯФ╣ Anti-Knocking Agents

Octane Number рдмрдврд╝рд╛рдиреЗ рдХреЗ рд▓рд┐рдП Anti-Knocking Compounds рдорд┐рд▓рд╛рдП рдЬрд╛рддреЗ рд╣реИрдВред

Examples

  • Tetra Ethyl Lead (TEL)
  • Ethanol
  • MTBE
  • Toluene

ЁЯФ╣ Cetane Number рдХреНрдпрд╛ рд╣реИ?

Cetane Number Diesel Fuel рдХреА Ignition Quality рдХрд╛ рдорд╛рдк рд╣реИред

рдпрд╣ рдмрддрд╛рддрд╛ рд╣реИ рдХрд┐ Diesel Fuel Compression Ignition Engine рдореЗрдВ рдХрд┐рддрдиреА рдЖрд╕рд╛рдиреА рд╕реЗ Ignite рд╣реЛрддрд╛ рд╣реИред


ЁЯФ╣ Definition of Cetane Number

"Cetane Number is the percentage by volume of Cetane present in a mixture of Cetane and Alpha-Methyl Naphthalene having the same ignition characteristics as the diesel fuel under test."


ЁЯФ╣ Reference Fuels for Cetane Number

Reference Fuel Cetane Value
Cetane (n-Hexadecane) 100
Alpha-Methyl Naphthalene 0

ЁЯФ╣ Example of Cetane Number

рдпрджрд┐ рдХрд┐рд╕реА Diesel Fuel рдХрд╛ Cetane Number 60 рд╣реИ, рддреЛ рдЙрд╕рдХреА Ignition Quality 60% Cetane рддрдерд╛ 40% Alpha-Methyl Naphthalene рдХреЗ рдорд┐рд╢реНрд░рдг рдХреЗ рд╕рдорд╛рди рд╣реЛрдЧреАред


ЁЯФ╣ Importance of Cetane Number

  • Easy Engine Starting
  • Smooth Combustion
  • Reduced Ignition Delay
  • Better Engine Performance
  • Lower Noise Level

ЁЯФ╣ Factors Affecting Cetane Number

  • Hydrocarbon Structure
  • Straight Chain Compounds
  • Fuel Purity
  • Additives
  • Engine Conditions

ЁЯФ╣ Cetane Improvers

  • Amyl Nitrate
  • Ethyl Nitrate
  • Alkyl Nitrates

ЁЯФ╣ Difference Between Octane Number and Cetane Number

Basis Octane Number Cetane Number
Fuel Type Petrol Diesel
Indicates Anti-Knocking Property Ignition Quality
Engine Type Spark Ignition Engine Compression Ignition Engine
Reference Fuel Iso-Octane Cetane
Desired Value High High

ЁЯФ╣ Characteristics of Good Fuel

Fuel Required Property
Petrol High Octane Number
Diesel High Cetane Number

ЁЯФ╣ Applications

  • Automobile Industry
  • Petroleum Industry
  • Fuel Testing Laboratories
  • Engine Design
  • Power Generation Systems

ЁЯФ╣ Industrial Importance

Petroleum Refineries Fuel Quality Control рдХреЗ рд▓рд┐рдП Octane Number рддрдерд╛ Cetane Number рдХрд╛ рдЙрдкрдпреЛрдЧ рдХрд░рддреА рд╣реИрдВред рдЖрдзреБрдирд┐рдХ Engines рдХреА Performance рдПрд╡рдВ Fuel Economy рдЗрди Parameters рдкрд░ рдирд┐рд░реНрднрд░ рдХрд░рддреА рд╣реИред


ЁЯФ╣ Viva Questions

  1. Octane Number рдХреНрдпрд╛ рд╣реИ?
  2. Cetane Number рдХреНрдпрд╛ рд╣реИ?
  3. Iso-Octane рдХрд╛ Octane Number рдХрд┐рддрдирд╛ рд╣реЛрддрд╛ рд╣реИ?
  4. Cetane Number рдХрд┐рд╕ Fuel рдХреЗ рд▓рд┐рдП рдЙрдкрдпреЛрдЧ рдХрд┐рдпрд╛ рдЬрд╛рддрд╛ рд╣реИ?
  5. Octane Number рддрдерд╛ Cetane Number рдореЗрдВ рдЕрдВрддрд░ рд▓рд┐рдЦрд┐рдПред

ЁЯФ╣ Exam Oriented Important Questions

  1. Octane Number рдХреЛ рдкрд░рд┐рднрд╛рд╖рд┐рдд рдХреАрдЬрд┐рдПред
  2. Cetane Number рдХреНрдпрд╛ рд╣реИ? рд╕рдордЭрд╛рдЗрдПред
  3. Octane Number рддрдерд╛ Cetane Number рдореЗрдВ рдЕрдВрддрд░ рд▓рд┐рдЦрд┐рдПред
  4. Anti-Knocking Agents рдХрд╛ рд╡рд░реНрдгрди рдХреАрдЬрд┐рдПред
  5. Diesel Fuel рдореЗрдВ Cetane Number рдХрд╛ рдорд╣рддреНрд╡ рд╕рдордЭрд╛рдЗрдПред

ЁЯФ╣ Conclusion

Octane Number Petrol Fuel рдХреА Anti-Knocking Quality рдХрд╛ рдорд╛рдк рд╣реИ рдЬрдмрдХрд┐ Cetane Number Diesel Fuel рдХреА Ignition Quality рдХреЛ рджрд░реНрд╢рд╛рддрд╛ рд╣реИред рджреЛрдиреЛрдВ Parameters Fuel Performance, Engine Efficiency рддрдерд╛ Fuel Quality Assessment рдХреЗ рд▓рд┐рдП рдЕрддреНрдпрдВрдд рдорд╣рддреНрд╡рдкреВрд░реНрдг рд╣реИрдВред

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