What is nozzle in impulse turbine?
Table of Contents
What is nozzle in impulse turbine?
Nozzle. The nozzle is installed to adjust and jet the fluid flow to strike the buckets. As mentioned earlier, it is the only part of the impulse turbine assembly that the pressure changes and the flow head are converted into kinetic energy.
What is the specific speed of impulse turbine?
Important Points
| Flow | Energy | Specific speed |
|---|---|---|
| Tangential | Impulse | Low (0 – 60 RPM) |
| Radial | Reaction | Medium (60 – 300) RPM |
| Axial | Reaction | High |
| (300 – 600) RPM |
What is velocity compounding for an impulse turbine?
The velocity compounded Impulse turbine was first proposed by C G Curtis to solve the problem of single stage Impulse turbine for use of high pressure and temperature steam. The rings of moving blades are separated by rings of fixed blades.
Why impulse turbine is called velocity turbine?
Impulse turbines are defined as turbines in which high-velocity jets of water or steam collide with the blades of the turbine to rotates the turbine and produce electricity using this winding. The impulse turbine is so named because it acts on the impulse force created for the striking blade of the water jet.
What is steam nozzle function?
1) The main function of the steam nozzle is to convert heat energy to kinetic energy. 2) To direct the steam at high velocity into blades of turbine at required angle. 1) Steam & gas turbines are used to produces a high velocity jet.
What is impulse steam turbine?
An impulse turbine has fixed nozzles that orient the steam flow into high speed jets. These jets contain significant kinetic energy, which is converted into shaft rotation by the bucket-like shaped rotor blades, as the steam jet changes direction.
How do you find the specific speed of a turbine?
Specific speed of a turbine calculator uses Specific speed of a turbine = (Speed*sqrt(Power))/(Head^(5/4)) to calculate the Specific speed of a turbine, The Specific speed of a turbine formula is defined as an index used to predict desired pump or turbine performance.
What is pressure and velocity compounding of steam turbine?
Compounding of steam turbine is used to reduce the rotor speed. It is the process by which rotor speed come to its desired value. A multiple system of rotors are connected in series keyed to a common shaft and the steam pressure or velocity is absorbed in stages as it flows over the blades.
How many sets of nozzles are there in a simple impulse turbine?
one set of
Explanation: There is only one set of nozzles in a simple impulse turbine. The complete expansion of steam takes place at once. The pressure of the steam doesn’t alter when the steam moves over the blades of the turbine.
When steam passes through nozzle its pressure and velocity?
Clarification: Steam nozzle is a passage of varying cross section, through which the heat energy of the steam is converted into kinetic energy. The velocity of steam in increased its pressure is decreased. It is usually used to produce high steam jets to drive the steam turbines. 2.
How do I calculate specific speed?
Example – Specific Speed for a Pump with different units
- US gpm, ft. Ns(US gpm, ft) = (1760 rev/min) (1500 gal/min)1/2 / (100 ft)3/4
- British gpm, ft. Ns(British gpm, ft) = (1760 rev/min) (1249 gal/min)1/2 / (100 ft)3/4
- m3/h, m. Ns(m3/h, m) = (1760 rev/min) (340 m3/h)1/2 / (30.5 m)3/4
- liter/min, m.
How is velocity compounded?
In velocity-compound staging a set of stationary nozzles is followed by two sets of moving blades with a stationary row of impulse blades between them to redirect the flow. Ideally this allows twice as much power to be extracted than from a single impulse stage for…
What is velocity and pressure compounding?
Pressure-velocity compounding is a combination of the above two types of compounding. In fact, a series of velocity-compounded impulse stages is called a pressure-velocity compounded turbine. Each stage consists of rings of fixed and moving blades.
