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In an impulse turbine, pressure drop does not occur because the working fluid (usually steam or water) expands through nozzles that convert its thermal energy into kinetic energy before it strikes the turbine blades. The high-velocity jet generated by this process imparts momentum to the blades, causing them to rotate without a significant change in pressure. As a result, the pressure remains relatively constant, and energy transfer occurs primarily through the conversion of kinetic energy rather than through pressure differentials.
What else can I help you with?
Describe the principle of impluse turbine?
An impulse turbine operates on the principle of converting the kinetic energy of a fluid into mechanical energy. Water or steam is directed through nozzles to create high-velocity jets, striking the turbine blades and causing them to rotate. The blades are designed to change the direction of the jet, maximizing the transfer of momentum while minimizing the pressure drop across the turbine. This design allows the turbine to efficiently harness the energy of the fluid without requiring a significant change in pressure.
How does rpm of steam turbine change with time?
The RPM of a steam turbine typically changes over time in response to variations in load demand and steam supply. During startup, the RPM gradually increases as steam pressure builds and the turbine accelerates. Under stable operating conditions, the RPM remains relatively constant, but it can fluctuate due to changes in load, steam flow, or operational adjustments. If the load decreases, the RPM may drop, while an increase in load can cause the RPM to rise, depending on the control mechanisms in place.
What is pressure drop across rotameter?
The pressure drop across a rotameter is the difference in pressure between the inlet and outlet of the device, caused by the flow of fluid through its tapered tube. This drop occurs due to the fluid's acceleration as it passes through the narrowing section, resulting in a decrease in pressure as described by Bernoulli's principle. The pressure drop is influenced by factors such as flow rate, fluid viscosity, and the geometry of the rotameter. It is important to consider this drop when designing systems to ensure proper operation and accurate flow measurement.
Is the pressure drop through a globe valve less than through a gate valve?
HECK NO the globe pattern offers the most pressure drop because of friction losses
Why is the throttling valve not replaced by an isentropic turbine in the ideal vapor-compression refrigeration cycle?
In an ideal vapor-compression refrigeration cycle, the throttling valve is used to reduce the pressure of the refrigerant, allowing it to expand and cool without doing work. Replacing it with an isentropic turbine would introduce additional complexity and cost, as the turbine would need to extract work from the refrigerant during expansion. This would alter the cycle's efficiency and require a more complex control system, deviating from the simplicity and effectiveness of the refrigeration cycle that relies on the throttling process to achieve the desired cooling effect. Thus, the throttling valve effectively maintains the cycle's simplicity while achieving the necessary pressure drop.
What are the differences between an impulse turbine and a reaction turbine?
The difference between impulse and reaction turbine goes here...... 1) In case of an impulse turbine the pressure remains same in the rotor or runners, but in case of reaction turbine the pressure decreases in runners as well as stators also. 2) In case of impulse turbine the pressure drop happens only in the nozzle part by means of its kinetic energy. In case of Reaction one the stators those are fixed to the diaphragm act as a nozzle.
How do you decide number of stages for a steam turbine?
It is generally based on the Type of rotor ( Impulse/ curtis) and the enthalpy drop per stage.
Describe the principle of impluse turbine?
An impulse turbine operates on the principle of converting the kinetic energy of a fluid into mechanical energy. Water or steam is directed through nozzles to create high-velocity jets, striking the turbine blades and causing them to rotate. The blades are designed to change the direction of the jet, maximizing the transfer of momentum while minimizing the pressure drop across the turbine. This design allows the turbine to efficiently harness the energy of the fluid without requiring a significant change in pressure.
What is difference bw condensing and non condensing steam turbines?
A condensing turbine uses all the energy from the steam going from high pressure turbine to secondary turbine to condensing turbine then sends the condensate back for reheating. where a non condensing turbine just uses the high pressure aspect of the steam then returns the low pressure stream back to be reheated. Condensng turbines utilises the entire available drop from high pressure to the vacuum in the condenser; a back pressure turbine only utilises only the top part, whereas an exhaust steam turbine utilises only th bottom part of the pressure drop. Hope that helps.
In blood vessels where does the greatest pressure drop occur?
the arterioles
What is pressure compounding?
Pressure compounding is a method used in steam turbines to improve efficiency by dividing the pressure drop across multiple stages. This involves passing steam through a series of turbine stages, with each stage operating at a different pressure level. By reducing the pressure drop across each stage, pressure compounding helps to extract more energy from the steam and increase the overall turbine efficiency.
What should be the possible reasons of vacuum drop of turbine?
In the low pressure side of a steam turbine, the vacuum is maintained by the condensation of steam in the condenser. At high loads, the condenser may not satisify the demand, allowing steam to remain gaseous for a longer period of time. This can cause pressure to rise.
Does there occur any change in melting point of ice by variation of pressure?
Yes, increase in pressure causes the freezing point to drop.
Why pressure drop occur even there was no leakage in hydrostatic test?
Isolating valves may have passing.
Does an industrial steam condenser work by a pressure drop?
From what I have read, it uses the heat of vaporization to create a vacuum due to condensation. So as steam condenses its volume is reduced. This creates a vacuum which increases the pressure drop accross the turbine. The larger the pressure drop accross the turbine, the better. I'm not an expert tho... http://books.google.com/books?id=7PeSdVhFhxgC&pg=PA41&lpg=PA41&dq=why+condenser&source=web&ots=HTeczt_DhL&sig=QS5YkcFzMQkTomz5y5FMb_Swsio&hl=en&sa=X&oi=book_result&resnum=1&ct=result
Why wheel chamber is high in turbine?
The wheel chamber in a turbine is designed to be high to accommodate the flow of water or steam at high velocities, allowing for efficient energy conversion. A taller chamber reduces pressure drop and turbulence, promoting smoother flow and enhancing the turbine's overall efficiency. Additionally, a higher chamber can help prevent cavitation by maintaining adequate pressure levels within the turbine. This design ultimately contributes to better performance and reliability in energy generation.
Why vacuum is created in condenser on steam turbine?
Firstly, vacuum is being created in turbine exhaust and condenser rather than being required. It is created to reduce the back-pressures and to improve the turbine efficiency. Also, with vacuum the designers can design large size last stage blades of LP turbine for maximizing the turbine output.
