What is turbo stall?

A compressor stall is a local disruption of the airflow in the compressor of a gas turbine or turbocharger. A stall that results in the complete disruption of the airflow through the compressor is referred to as a compressor surge.

What is the difference between surge and stall?

In elementary terms, stall is a disturbance of the flow in the tangential direction, while surge is a disturbance in the axial direction. During stalled operation, the average flow rate through the compressor is steady, but during surge, the flow rate will pulse—sometimes so violently that reversed flow is induced.

What happens during a compressor stall?

A compressor stall occurs when there is an imbalance between the air flow supply and the airflow demand; in other words, a pressure ratio that is incompatible with the engine RPM. When this occurs, smooth airflow is interrupted and turbulence and pressure fluctuations are created within the turbine.

Is turbo flutter harmful?

When the compressed air has nowhere to go, it causes the turbo rotational speed to rapidly drop, and attempts to push against the wheel. This can cause premature wear on your turbo, however closed throttle flutter on modern turbochargers is unlikely to cause a noticeable drop in turbocharger lifespan.

Why do turbos whistle?

Turbo whistle is the sound of the compressor inside the turbocharger speeding up (also known as 'spooling up', which is why it kicks in at the boost threshold (when the turbo starts to kick in) as you accelerate up the rev range.

The Truth About Compressor Surge

Can you recover from a compressor stall?

Response and recovery

The appropriate response to compressor stalls varies according to the engine type and situation, but usually consists of immediately and steadily decreasing thrust on the affected engine.

Is compressor stall an emergency?

Compressor stalls are a leading cause for emergency shutdowns on gas turbine engines.

What is choking in compressor?

Choking is the condition which occurs in the compressor in which it operates at a very high mass flow rate and flows through the compressor can't be further increased as mach number at some part of the compressor reach to unity i.e. to sonic velocity and the flow is said to be choked.

What phase of flight is a compressor stall most likely to happen?

Shortly after takeoff, the flight experienced something called a “compressor stall.” The basic concept of how a jet engine works is fairly simple. As air enters the front of the engine, it gets compressed. Fuel and ignition are introduced which causes combustion, and then the gases are exhausted.

Why do aircraft engines stall?

When an airplane stalls, it's no longer able to produce lift. This isn't due to a mechanical problem, such as a failing engine. Rather, airplanes experience stalls when the angle at which they enter the wind current is greater than the critical angle of attack.

What causes engine flameout?

Engines can flame out for a variety of reasons: Fuel starvation or exhaustion. Compressor Stall. Ingestion of foreign objects such as volcanic ash, hail, ice,birds or an exceptionally large quantity of liquid water.

What is choking and surging?

Surge is a violent flow reversal that occurs when the process restricts the compressor flow below a certain minimum value. Choke occurs when the process does not create enough restriction to the compressor flow and the compressor operates at its maximum flow for a given performance level.

What is stall margin?

The stall margin (SM) is the percentage of lift coefficient. remaining for use by the pilot at any given time in the. airplane's flight operation.

Where is the highest gas pressure in a turbojet engine?

The highest gas pressure in a turbojet engine occurs at the outlet of the compressor. The compressor outlet is the same as the entrance of the burner section.

What causes engine surge while driving?

Usually, there are three leading causes behind car surging when accelerating. First, it can be that your fuel is making its way to your engine correctly. Second, it can be due to faulty torque converters. Lastly, engine misfires can come from a loss of vacuum coming from the intake system.

How a pilot will come to know about compressor stalls?

It can usually be identified by a loud bang, pop, or buzzing sound. Expect to feel a loss of thrust, see your RPM winding back, and your EGT/ITT/FTIT either increase or decrease based on your altitude. Anything that causes a disruption of airflow can cause a compressor stall.

What causes surge in compressor?

Surge occurs when there is no forward flow of gas through the compressor and a reversal of flow occurs. The gas that is being compressed gets pushed backward through the centrifugal compressor. When this surge (flow reversal) occurs, which can happen in milliseconds, the rotor is affected.

What causes turbine engine failure?

Possible causes

Engine failures can be caused by mechanical problems in the engine itself, such as damage to portions of the turbine or oil leaks, as well as damage outside the engine such as fuel pump problems or fuel contamination.

What recovery would be appropriate in the event of compressor stall?

(9067)- What recovery would be appropriate in the event of compressor stall? A- Reduce the throttle and then rapidly advance the throttle to decrease the angle of attack on the compressor blades, creating more airflow.

What is Hammershock?

One type of adverse flow interaction is caused by an engine compressor surge which generates a large transient pressure rise at the engine compressor face that propa- gates rapidly upstream through the duct. This transient pressure rise is known as a hammershock.

Why does a turbo chirp?

the exhaust side of the turbo has to have more psi to keep the turbo turning hard, as the engine gets a load and the psi of both side start to equal or cross paths the turbo will chirp.

Does a cold air intake make your turbo louder?

Generally speaking, a cold air intake will cause your engine to sound more aggressive. This is because the air coming into the engine is cooler and therefore, denser. This colder air causes the engine to run a little bit hotter, and that translates to a more powerful sounding car.