What are the advantages and disadvantages of the IDI swirl chamber over the open chamber?

Smoother and quieter idling—since matching of small air supply with the small fuel supply is possible. Cleaner exhaust resulting in less air pollution. The disadvantages of the IDI swirl chamber over the open chamber are as follows: Higher specific fuel consumption resulting in poorer fuel economy.

What is swirl motion in IC engines?

Swirl is an important flow pattern of air motion commonly found in diesel engines; it not only affects the fuel-air mixing and combustion processes, but also has a significant impact on heat transfer, combustion quality, and engine-raw emissions. Swirl is used to describe circulation about the cylinder axis.

What is swirl motion?

The motion can be described as a swirling flow revolving around an imaginary, central axis residing inside the cylinder volume. One type of swirling motion, aptly called swirl motion , is depicted in Figure 1.3, left. The ideal swirl motion spirals around an axis aligned with the cylinder volume found at the center.

What are the applications of swirl chamber?

Swirl chamber This type of chamber finds application in engines in which fuel control and engine stability are more important than fuel economy. These are also called Ricardo chambers, named after the inventor, Sir Harry Ricardo.

What are the major advantages of the compression swirl combustion chamber?

Greater air utilization due to strong swirl leading to smaller and cheaper engine. Swirl is proportional to speed, so suitable for variable speed operation. Smooth engine operation.

What is the advantage of IDI engine?

The advantages of the indirect injection (IDI) engine are its quieter combustion and a combustion system that is more amenable to high speed operation. The disadvantage of the IDI engine, is that the direct injection (DI) engine has a 10–15\% lower fuel consumption.

What is meant by swirl and tumble in CI engines Why are they important?

One important factor of controlling the combustion process and exhaust emission is increasing pre-combustion turbulence level by in-cylinder gas motion. Swirl and tumble are both rotational flows and their rotation axes are parallel to the piston motion and perpendicular to the axis of the cylinder respectively.

What is swirl in CI engine Mcq?

Solution: In compression ignition engines, swirl denotes a Rotary motion of the gases in the chamber. In compression ignition engines, swirl denotes a rotary motion of the gases in the chamber as swirl is always related to rotary motion. Inject fuel in a chamber of high pressure at the end of compression stroke.

What do swirl valves do?

Swirl flaps are small butterfly valves located within the inlet manifold on modern diesel and petrol engines, they are designed to help regulate the fuel to air ratio, improve emissions and help generate better torque at low engine speeds.

Why swirl is required for CI engine combustion chamber?

Swirl is used in CI engine concepts to promote more rapid mixing between the inducted air charge and the injected fuel. Swirl is also used to speed up the combustion process and in two-stroke engines, it improves scavenging.

What are the three methods of generating swirl in CI engine combustion chamber?

In the cylinder of a combustion engine, three common organized flows such as swirl, tumble and squish are generated by modifying intake ports, valves, cylinder head, piston surface and placing flow blockages, vanes in the intake ports.

What are the types of combustion chamber compare its advantages and disadvantages?

Annular combustion chambers are characterized by low pressure losses, small size and good ignition behavior. ADVANTAGES: Low pressure losses Small size Good ignition behavior More number of fuel jets DISADVANTAGES: Maintenance and inspection are difficult.