What is a stratified charge combustion chamber?
The term “stratified charge” refers to the working fluids and fuel vapors entering the cylinder. Usually the fuel is injected into the cylinder or enters as a fuel rich vapor where a spark or other means are used to initiate ignition where the fuel rich zone interacts with the air to promote complete combustion.
What is the purpose of a stratified combustion charge in a GDI gasoline direct injection engine?
In naturally aspirated direct injection gasoline engines, the so-called ‘stratified charge’ combustion with globally lean mixture allows improvement in efficiency at low speeds and low loads.
What is the working principle of pre chamber stratified charge engine?
Working. A stratified charge engine only pulls air through the transfer system. The fuel required for combustion is forced into the cylinder through an injector placed in the top of the cylinder (head). The injector sprays a fuel/air mixture in the form of a fuel cloud into the cylinder.
Which of the following is true for stratified charge engine?
Which of the following is true for stratified charge engine? Explanation: Stratified charge engine has multi-fuel capabilities. The advantages of a stratified charge engine are higher thermodynamic efficiency and reduced air pollution.
What is a stratified?
Stratified random sampling is a method of sampling that involves dividing a population into smaller groups–called strata. The groups or strata are organized based on the shared characteristics or attributes of the members in the group. The process of classifying the population into groups is called stratification.
What is the difference between MPI and GDI?
Compared to conventional MPI engines of a comparable size, the GDI engine provides approximately 10% greater output and torque at all speeds. In high-output mode, the GDI engine provides outstanding acceleration. The following chart compares the performance of the GDI engine with a conventional MPI engine.
What is the difference between GDI and fuel injection?
GDI, often known as Gasoline Direct Injection, is a type of fuel injection that injects high-pressure gasoline straight into each cylinder’s combustion chamber. In comparison, Traditional port fuel injection injects gasoline into the intake at low pressure.
Which are the various methods of charge stratification?
METHODS OF CHARGE STRATIFICATIONThe stratified charge engines can he classified into two main types, according to the method offormation of the heterogeneous mixture in the combustion chamber. 1. Those using fuel injection and positive ignition (including swirl stratified charge engines).
What is direct stratified injection?
Compared to standard direct injection, which generally sprays fuel during the engine’s intake stroke, the stratified system will allow the engine to inject fuel during the compression stroke – almost like a diesel engine. “The injection is actually happening on the upstroke,” he says.
Which of the following cycle is used for compression ignition engine?
Diesel cycle is used in the compression ignition engine.
Which is the most preferred CI engines fuel?
paraffins
For CI engines, the normal paraffins are the best fuels and aromatics are the least desirable. For SI engines the aromatics are the best fuel and the paraffins are least desirable.
What is a stratified charge on a gas engine?
The term “stratified charge” refers to the working fluids and fuel vapors entering the cylinder. Usually the fuel is injected into the cylinder or enters as a fuel rich vapor where a spark or other means are used to initiate ignition where the fuel rich zone interacts with the air to promote complete combustion.
What are the different types of charge stratification systems?
Stratified-charge combustion systems can be categorized as wall-guided, air-guided, and spray-guided according to the main mechanism to form the charge stratification. In wall-guided systems, different in-cylinder flow patterns along with the typical interaction between the fuel spray and a piston bowl can be used to achieve mixture stratification.
What is a stratified charge on a 4-stroke?
A stratified charge can allow for slightly higher compression ratios without ” knock ,” and leaner air/fuel ratio than in conventional internal combustion engines. Conventionally, a four-stroke (petrol or gasoline) Otto cycle engine is fueled by drawing a mixture of air and fuel into the combustion chamber during the intake stroke.
What are the advantages of a stratified charge?
A stratified charge can allow for slightly higher compression ratios without ” knock,” and leaner air/fuel ratio than in conventional internal combustion engines. Conventionally, a four-stroke (petrol or gasoline) Otto cycle engine is fueled by drawing a mixture of air and fuel into the combustion chamber during the intake stroke.