Table of Contents
What increases the rate of combustion?
Temperature: Raising the temperature increases the kinetic energy of both oxygen and fuel molecules. Since more molecules are reacting in the same period of time this increases the rate of combustion.
What factors affect combustion reaction?
Three things are required in proper combination before ignition and combustion can take place—Heat, Oxygen and Fuel.
- There must be Fuel to burn.
- There must be Air to supply oxygen.
- There must be Heat (ignition temperature) to start and continue the combustion process.
What factors can increase or decrease reaction rates?
The factors that affect reaction rates are:
- surface area of a solid reactant.
- concentration or pressure of a reactant.
- nature of the reactants.
- presence/absence of a catalyst.
How do different factors affect the rate of reaction?
Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.
What type of change is combustion?
combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.
Which of these factors will cause an increase in the rate of reaction?
In general, increasing the concentration of a reactant in solution, increasing the surface area of a solid reactant, and increasing the temperature of the reaction system will all increase the rate of a reaction. A reaction can also be sped up by adding a catalyst to the reaction mixture.
What are the factors that affect the combustion of fuel?
The important factors 1 Molecular structure of fuel 2 Temperature of self ignition 3 Affect of high temperature and pressure after compression 4 Temperature of combustion wall chamber 5 Rate of burning 6 Spark timing 7 Spark intensity and duration 8 Air-fuel ratio 9 Charge distribution 10 Charge temperature
How does the compression ratio affect the combustion process?
In addition to that the amount of residual gases present in the charge will decrease which results in increased rate of chemical action and temperature of flame. It is very important to study the compression ratio in the combustion process.
How does the rate of combustion affect the detonation?
The exhaust valves and effective cooling lead to reduce the detonation. The huge rate of burning will give less time for flow of heat to the wall of chamber and hence results in high temperature that normally increases the tendency to detonate.
What are the various factors influencing flame propagation?
High pressure and temperature also facilitate the second phase of combustion. Even though the high compression ratio favours the flame propagation, it is not recommended to push the compression ratio beyond a certain limit since it causes high temperature and eventually detonation in the engine.