What happened when back pressure increased?

As back pressure increases, the pressure drop across the turbine will decrease, the turbocharger shaft speed will be reduced and the intake boost pressure and intake air mass flow will decrease.

What is back pressure in a turbine?

Back Pressure Turbines: a type of steam turbine that is used in connection with industrial processes where there is a need for low or medium pressure steam. The high pressure steam enters the back pressure steam turbine and while the steam expands – part of its thermal energy is converted into mechanical energy.

What is meant by back pressure?

Back pressure (or backpressure) is a resistance or force opposing the desired flow of fluid through pipes, leading to friction loss and pressure drop. Similarly, bending or other operations on a pipe (such as a stock car exhaust system with a particularly high number of twists and bends) can reduce flow rate.

Is back pressure the same as pressure drop?

So the two are different. Pressure drop is caused by agents inside whereas back pressure is controlled by you from outside.

What is low pressure turbine?

The Low Pressure Turbine (LPT) is uniquely designed to provide high aerodynamic efficiency in low pressure ratio operation, to recover exhaust energy whilst minimising back pressure.

What is exhaust pressure in steam turbine?

Exhaust pressure at the exit of the last-stage blades is one of the most important parameters that limit the operation of a steam turbine, especially on days with hot ambient conditions. Last-stage blades are generally highly stressed and are vulnerable to vibrations caused by aeromechanics instabilities.

Is back pressure stagnation pressure?

Here, the pressure at the exit is referred to as the back-pressure, and the pressure at the entry is the stagnation pressure. The ratio between them is the back-pressure ratio, which can be used to control flow velocity. When the stagnation pressure equals the back-pressure, there is no flow.

What is a back pressure turbine?

Back-pressure turbines are commonly found at refineries, district heating units, pulp and paper plants, and desalination facilities where large amounts of low pressure process steam are needed. The electric power generated by the back-pressure turbine is directly proportional to the amount of process steam required.

What happens when the back pressure of a steam turbine is raised?

However, if the turbine back pressure is raised to above atmospheric pressure so that the turbine exhaust steam can be transported to the process heat load then the steam will give up its latent heat usefully rather than reject this to the condenser cooling water.

What is the back pressure in power turbine secondary flow analysis?

At first, 1-D system-level power turbine secondary flow analyses were carried out with normal back pressure (3.0 kPa) and with high back pressure (11.37 kPa). In addition, 3-D computational fluid dynamic simulations were performed to understand the cavity flow dynamics and disc heat transfer coefficient variations.

What happens when back pressure is too high in an engine?

At increased back pressure levels, the engine has to compress the exhaust gases to a higher pressure which involves additional mechanical work and/or less energy extracted by the exhaust turbine which can affect intake manifold boost pressure. This can lead to an increase in fuel consumption, PM and CO emissions and exhaust temperature.