Multiple Venturi Carburetor Construction and Working, Advantages of Multiple Venturi Carburetors

multiple venturi carburetor

🔗Construction and working principle of simple carburetor
🔗Essential parts of modern carburetor and their functions

How multiple venturi carburetor works?

When one or more secondary venturi concentrically enclosed inside the main venturi of carburetor, then it is called multiple venturi carburetor. The secondary venturies are known as boost venturi. The boost venturi located at the upstream of the main venturi. The boost venturi positioned in such a way that the discharge end is located at the throat of main venturi and the pressure at the exit of boost venturi is equal to the throat pressure of main venturi. In this arrangement, only a fraction of air flow thought the boost venturi. The fuel nozzle is located at the throat of boost venturi.

Difference between Constant Choke Carburetor and Constant Vacuum Carburetor

carburetor constant vacuum constant choke

🔗What is carburation?
🔗Design and working principle of simple carburetor

What is a constant choke carburetor?

Constant choke carburetor is the type of carburetor in which the air and fuel flow area is always kept constant. In constant choke carburetor, the air-fuel ratio is changed due to varying pressure difference or depression as per the demand. This type of carburetor should have a compensating device to avoid air-fuel mixture enrichment with the increase in speed. Example: Solex and Zenith carburetor.

🔗Multiple venturi carburetor construction, working, advantages

Differences between Petrol and Liquid Petroleum Gas (LPG)

petrol vs lpg

Comparison between petrol and liquid petroleum gas

🔗Advantages and disadvantages of liquid petroleum gas (LPG)

Liquid Petroleum Gas (LPG)
Petrol is in the liquid phase at ambient condition.
LPG is in gases sate at ambient condition, it is liquefied at high pressure.
Petrol has odour
LPG is odourless. Powerful odorant like ethanethiol is added to LPG to detect the fuel leakage.
Combustion is not clean as in the LPG
Clean combustion.
High emission when compared to LPG
Low emission
Ignition temperature is lower than LPG
High ignition temperature
Noisier and vibration when compared to LPG engine

Liquid Petroleum Gas (LPG) Advantages and Disadvantages of LPG


Introduction to LPG

Propane and Butane are the two flammable gaseous obtained from oil wells, they also obtained from the petroleum refining process. This two gases compressed and cooled to form liquid known “liquid petroleum gas”. They are widely used as fuel for cooking, heating. Also used in IC engine, buses, and cars and referred to as autogas. Clean LPG is odorless gas, for safety concern and in order to detect the leaks, powerful odorant like ethanethiol is added to LPG.

Advantages and Disadvantages of Hydrogen as Fuel in IC Engine


Advantages of hydrogen fuel

  • Renewable energy.
  • Easy production - Hydrogen can produce by many chemical processes including simple electrolysis of water.
  • Reduce the dependency on fossil fuel.
  • High energy content per liter (only when stored as liquid form)
  • Physical delay of fuel is almost zero.
  • Good load response.
  • Clean combustion of fuel and low emission.
  • Since there is no carbon in the fuel, there is would be no carbon monoxide and hydrocarbons in the exhaust gas.
  • Even fuel leakage to the environment does not consider as pollution.

Alcohol as IC Engine Fuel - Advantages and Disadvantages of Alcohol Fuels

spirit lamp

Introduction to alcohol fuels

Alcohol is the one of the main liquid fuel alternative to the gasoline in combustion engines. Alcohol fuels are attractive because they can be obtained from nature as well as it can manufacture very easily. The methanol, ethanol, propanol, and butanol are the main type of alcohol fuel. In which ethanol is the most widely used alcohol because of its abundance and leas toxicity. More complex alcohol is not popular as fuel because they are not commercially viable.

In theory, the alcohol is get completely oxidized in the engine and get convert it into the carbon dioxide and water. But in reality, the alcohol burn incompletely and there will be many toxic by-products like carbon monoxide, aldehydes etc. The theoretical chemical reaction (oxidization) happening to the alcohol fuels is given below

alcohol oxidization equation

Advantages of alcohol as fuels

  • Abundance in availability; obtained naturally and synthetically.
  • Reduce the dependence fossil fuels.
  • Emission is very low when compared to a petrol engine.
  • Alcohol is ultraclean and sulphur free.
  • Alcohol has high flame speed.
  • Alcohol contains oxygen, so it requires less amount of air for stoichiometric combustion.
  • Alcohol possesses high latent heat of vaporization, which results in low intake temperature. This reduces the work input of compression stroke and increases volumetric efficiency.
  • Alcohol possesses high octane number, it can run high efficiently by high compression ratio.
  • The combustion of alcohol gives more moles of exhaust gas, which results in more pressure and power in the expansion stroke.

Disadvantages of alcohol fuels

  • Low calorific value, almost half of that of gasoline. For equal thermal efficiency more volume alcohol is required.
  • Alcohol fuels have poor ignition characteristics.
  • Alcohols are hygroscopic, absorb water content from the air. That increase the difficulty of transportation and storage.
  • High chance of vapor lock in fuel delivery system.
  • Aldehydes are one of the by-products of incomplete combustion of alcohol. The aldehyde emission would be serious when as much alcohol is consumed as gasoline.
  • Danger of storage tank due to the low vapour pressure of alcohols. A simple air leak can create a combustible mixture.
  • The low vapour pressure also results the poor cold weather starting characteristics.
  • Alcohol produces invisible flames, which is considered as dangerous in fuel handling. This problem can be overcome by adding fuel additives.
  • Lower exhaust temperature results longer time to heat the catalytic converter. Catalytic converter takes some time to get its efficient operating temperature.
  • Alcohol is more corrosive on copper, brass, aluminium etc. this cause deteriorate action on engine, gasket, fuel line and fuel tank. This put some restriction (selection of material) in the engine design and manufacturing process.
  • The strong odor alcohol cause headaches, dizziness, and many people find it is offensive.
  • The alcohol fuel production by fermentation of biomass like corn (bioalcohols) may alter the food production principles.