Table of Contents
- 1 What happens during the combustion stage of a jet engine?
- 2 Does pressure change in a combustion chamber?
- 3 What is a low pressure turbine in jet engine?
- 4 What does the low pressure compressor do?
- 5 How does a combustion reaction occur?
- 6 How does combustion affect pressure?
- 7 Which airflow is used to support combustion in the combustion section of a gas turbine engine?
- 8 Where is the highest gas pressure in a turbojet engine?
- 9 What happens in the combustion section between compressor and turbine?
- 10 What happens if the engine pressure is too high?
What happens during the combustion stage of a jet engine?
In the basic jet engine, air enters the front intake and is compressed (we will see how later). Then the air is forced into combustion chambers where fuel is sprayed into it, and the mixture of air and fuel is ignited. Gases that form expand rapidly and are exhausted through the rear of the combustion chambers.
Does pressure change in a combustion chamber?
where p is the pressure. The numbers indicate the two stages of the cycle. Temperature and pressure in the combustion chamber both increase during the combustion process. The final value of the pressure depends on a temperature factor times the initial value of the pressure.
What is the purpose of the combustion section on an engine?
The combustion section houses the combustion process, which raises the temperature of the air passing through the engine. This process releases energy contained in the air/ fuel mixture. The major part of this energy is required at the turbine or turbine stages to drive the compressor.
What is a low pressure turbine in jet engine?
A low pressure turbine within a turbofan jet engine consists of five repeating stages. The turbine inlet stagnation temperature is 1200 K and the inlet stagnation pressure is 213 kPa. It operates with a mass flow of 15 kg s−1 and generates 6.64 MW of mechanical power.
What does the low pressure compressor do?
Low pressure compressor (LPC) systems drive and compress high volumes of air from the external environment into the high pressure compressor section.
Why does combustion happen?
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.
How does a combustion reaction occur?
A combustion reaction occurs when a substance reacts quickly with oxygen (O2). For example, in the Figure below, charcoal is combining with oxygen. Combustion is commonly called burning, and the substance that burns is usually referred to as fuel. Fuel + O2 → CO2 + H2O.
How does combustion affect pressure?
The combined effects of pressure and oxygen concentration on the burning rate, combustion flow field, and ignition were evaluated. Results showed that at low pressure, the burning rate was less intense with a decrease in the mass loss rate. However, the reduction in pressure caused a shortened ignition delay time.
Why does combustion increase pressure?
During combustion, the pressure increases by a factor of 1.16 as the number of molecules rises, and another factor of 4.3 due to the temperature, leading to a total factor of 5 in pressure increase.
Which airflow is used to support combustion in the combustion section of a gas turbine engine?
Primary air
Combustion takes place in the forward end or primary zone of the cans. Primary air (amounting to about one fourth of the total engine’s total airflow) is used to support the combustion process.
Where is the highest gas pressure in a turbojet engine?
12 (8119) – Where is the highest gas pressure in a turbojet engine? C- In the entrance of the burner section.
Which part of the jet engine shows the pressure value?
This image, referenced in this question, shows in green the pressure value in a jet engine: The combustion section between compressor and turbine is where fuel is injected, mixed with air, and… Stack Exchange Network
What happens in the combustion section between compressor and turbine?
The combustion section between compressor and turbine is where fuel is injected, mixed with air, and burnt. Why is there a pressure drop while combustion occurs and temperature suddenly increases by 1,500°C (to be compared with pressure increaseafter ignition in a reciprocating engine).
What happens if the engine pressure is too high?
If the pressure was increasing, the flow would stop and reverse and the engine would stop operating.
What is the pressure drop in an annular combustor?
In annular combustor, the pressure drop is about 2\%, mostly due to (cold) friction. Source(p. 66)$\\endgroup$ – mins Apr 30 ’20 at 15:39 1 $\\begingroup$@mins yes you are right. I had found from another Q&Athat Rayleigh flow is indeed applicable and the fact that mass addition being very small clearly supports the assumption.