Quick Answer: What Is The Possible Cause When A Turbine Engine Indicates No Change In Power Setting Parameters But Oil Temperature Is High?

What is difference between impulse and reaction turbine?

The main difference between the impulse turbine and the reaction turbine is that, in the former, there is a pressure drop across the fixed blades only, whereas in the latter, there is a pressure drop across both the fixed and the moving blades..

Which turbine has highest efficiency?

Large Francis turbines are individually designed for each site to operate with the given water supply and water head at the highest possible efficiency, typically over 90%. In contrast to the Pelton turbine, the Francis turbine operates at its best completely filled with water at all times.

What are the factors affecting thrust?

FACTORS AFFECTING THRUST The factors that affect the thrust of a gas turbine engine include air density, airspeed/ram effect and engine RPM.

What is the relationship between turbine engine speed and thrust?

On a jet engine, thrust is proportional to rpm (mass flow) and temperature (fuel/air ratio). These are matched and a further variation of thrust results from the compressor efficiency at varying rpm. The jet engine is most efficient at high rpm, where the engine is designed to be operated most of the time.

What are the factors affecting pressure?

Temperature, pressure, volume and the amount of a gas influence its pressure.

Why does the pressure drop slightly or remain constant in the combustion section of a turbine engine?

Why does the pressure drop slightly or remain constant in the combustion section of a turbine engine? … So the pressure must be decreasing to maintain desired flow. If the pressure was increasing, the flow would stop and reverse and the engine would stop operating. If the pressure was constant, it would keep moving.

Which of the following is a good indication of a malfunctioning fuel nozzle when inspecting the exhaust section of an aircraft turbine engine?

This section must be thoroughly inspected along with the inspection the combustion section and turbine section of the engine. Inspect the exhaust cone and exhaust nozzle for cracks, warping, buckling, or hotspots. Hotspots on the tail cone are a good indication of a malfunctioning fuel nozzle or combustion chamber.

What is the profile of a turbine engine compressor blade?

3 (8110) – What is the profile of a turbine engine compressor blade? A cutout that reduces blade tip thickness.

Which of the following influences the operation of an automatic fuel control unit on a turbojet engine?

PowerplantQuestionAnswerWhich of the following influences the operation of an automatic fuel control unit on a turbojet engine?Burner pressureWhat is meant by a shrouded turbine?The turbine blades are shaped so that their ends form a band or shroud.21 more rows

How does a turboprop engine start?

When the high pressure shaft reaches some percentage of its maximum rpm, the fuel is injected into the engine, the ignitors inside the engine fires a spark to ignite the fuel and there the engine starts. The fuel shouldn’t be injected when the shaft has not reached a suitable rpm.

How does engine thrust vary with temperature?

As the temperature of the air increases its density decreases. Therefore the thrust produced by the engine decreases. As the air pressure increases, its density increases, causing thrust produced by the engine to increase. Altitude has a double effect on thrust.

What are the three types of turbine blades?

Turbine blades are classified into three types: Impulse, reaction, and impulse-reaction.

What is the purpose of the exhaust section of a turbine engine?

Exhaust or nozzle — Turbine exhaust gases pass through the propelling nozzle to produce a high velocity jet. The nozzle is usually convergent with a fixed flow area. Supersonic nozzle — For high nozzle pressure ratios (Nozzle Entry Pressure/Ambient Pressure) a convergent-divergent (de Laval) nozzle is used.

Why is Brayton pressure constant?

Ideal Brayton cycle: isentropic process – ambient air is drawn into the compressor, where it is pressurized. isobaric process – the compressed air then runs through a combustion chamber, where fuel is burned, heating that air—a constant-pressure process, since the chamber is open to flow in and out.

What is the most common type of combustor used in turbine engines today?

Early gas turbine engines used a single chamber known as a can type combustor. Today three main configurations exist: can, annular and cannular (also referred to as can-annular tubo-annular). Afterburners are often considered another type of combustor.

What is meant by a double entry centrifugal compressor?

A centrifugal compressor with vanes on both sides of the rotor. The compressor takes fluid on both sides of the impeller and discharges it from its periphery.

What is the difference between turbine and compressor?

The basic difference between both is that : 1 ) Turbine delivers work, while compressor requires work. … Turbine extract energy by decreasing the pressure, while compressor increases fluid pressure.

What does pt7 mean?

turbine discharge pressureIf it is needed for calculating thrust during an engine trim check, turbine discharge pressure (Pt7) is also shown on these curves.