antiknock

Thân thiện

This fuel has excellent antiknock properties.

Definition

1. Adjective:

   • Suppressing or eliminating engine knock in combustion engines: Describes a substance or property that prevents the unwanted knocking or pinging sound in an internal combustion engine, which is caused by improper fuel combustion.

2. Noun:

   • Any of various compounds that are added to gasoline to reduce engine knocking: A chemical additive, such as tetraethyl lead (historically) or modern compounds like methylcyclopentadienyl manganese tricarbonyl (MMT), mixed with fuel to increase its octane rating and prevent premature detonation.

Usage Examples

• Adjective:

  • The new fuel formula has excellent antiknock characteristics.
  • Automakers require fuels with a high antiknock rating for high-performance engines.

• Noun:

  • Tetraethyl lead was once a common antiknock in gasoline.
  • Modern antiknocks are less harmful to the environment than lead-based ones.

Advanced Usage

• Technical Specification: The term is often used in technical contexts related to fuel engineering, automotive performance, and environmental regulations.
  • The research focuses on developing a novel, biodegradable antiknock.

Variants and Related Words

• Knock (n/v): The sharp sound caused by premature fuel combustion in an engine.
• Octane rating/Octane number (n): A standard measure of a fuel's antiknock properties.
• Detonation (n): The technical term for the uncontrolled combustion (knock) that antiknock additives prevent.

Synonyms

• Knock suppressor (n): A direct descriptive synonym.
• Octane booster (n): A common term highlighting the additive's function of increasing octane rating to prevent knock.

Related Compounds/Phrases

• Lead-based antiknock: Refers to the now largely banned additives containing tetraethyl lead.
• Antiknock agent: A fuller, more descriptive term for the noun form.
• Antiknock index: A calculated value (often the average of Research Octane Number and Motor Octane Number) used to label gasoline pumps.

Học thuật

Adjective

1. suppressing or eliminating engine knock in combustion engines
   • antiknock properties
   • antiknock rating

Noun

1. any of various compounds that are added to gasoline to reduce engine knocking

Từ đồng nghĩa

• antiknocking