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The bypass ratio of a turbine, particularly in the context of turbofan engines, is the ratio of the mass of air that bypasses the engine core to the mass of air that passes through the engine core. A higher bypass ratio indicates that more air is bypassed, typically resulting in greater fuel efficiency and lower noise levels. Turbofans with high bypass ratios are commonly used in commercial aviation, while those with lower ratios are found in military and supersonic aircraft.
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What is turbine diffuser and its pressure recovery?
Turbine diffusers are configured to improve pressure recovery within the turbo machinery. The diffuser both converts the non-uniform flow off the impeller into a uniform velocity profile and converts the dynamic energy of the flow into pressure with minimal losses. With an effective diffuser, the rotor exit static pressure will be less than the discharge value which increases the total/static pressure ratio of the turbine. With this increase in total/static pressure ratio, the total to total pressure ratio is reduced, but the overall turbine efficiency is improved.. Turbine diffusers are configured to improve pressure recovery within the turbo machinery. The diffuser both converts the non-uniform flow off the impeller into a uniform velocity profile and converts the dynamic energy of the flow into pressure with minimal losses. With an effective diffuser, the rotor exit static pressure will be less than the discharge value which increases the total/static pressure ratio of the turbine. With this increase in total/static pressure ratio, the total to total pressure ratio is reduced, but the overall turbine efficiency is improved.. For more information Read the Handbook of turbomachinery (Joseph Sherma, 2003 pg 342-348):
What is power-to-weight ratio of steam turbine and gas turbine?
there is a mathematical formula to figure the actual power measured in Inchpounds of torque for both types of turbine engines. due to the light weight of the engine and the very high speeds in which they operate they are very efficient compared to other type of power plants generally the rough power to weight ratio of a typical aircraft turbine engine is around 85 to 95% output power compared to the actual weight of the type engine used.the exception to this would be a turbo-fan engine used on high speed aircraft which the power output is measured in footpounds of thrust
How do you effect the gas turbine exhaust pressure loss on performance?
Gas turbine exhaust pressure loss negatively impacts performance by reducing the effective pressure ratio across the turbine. This loss can lead to decreased power output and efficiency, as the turbine has to work harder to achieve the same thrust or energy output. Additionally, higher exhaust pressure can result in increased back pressure, potentially affecting the overall system's thermal efficiency and contributing to higher fuel consumption. Managing exhaust pressure losses through design optimizations and control systems is crucial for enhancing turbine performance.
What is difference between radial flow turbine and axial flow turbine?
in a radial flow turbine the steam enters the turbine in the direction of its radius and leaves it in the direction of the axis of the shaft. in a axial flow turbine the steam enters the turbine in the direction of the axis of the shaft and leaves the turbine in the same direction.
What is most efficient gas turbine or steam turbine?
Gas turbines are generally more efficient than steam turbines, especially in terms of power-to-weight ratio and startup time. They can achieve higher efficiency in combined cycle setups, where waste heat from the gas turbine is used to generate steam for a steam turbine. However, steam turbines can be more efficient in large-scale power plants that operate continuously. Ultimately, the choice between the two depends on specific application needs, fuel availability, and operational conditions.
What is bypass ratio in gas turbine engine?
bypass ratio im an early singlr or twin-spool bypass engine is the ratio of cool air mass flow passed through the bypass duct to the air mass flow passed the high pressure system. Bypass ratio for the fan ducted bypass engine is the ratio of total air mass flow through the air fan stage to the air mass flow that passes through the turbine section/high pressure(engine core) system.A high bypass ratio i.e 5:1 is usually common with ducted fan engine.
What is speed ratio of turbines?
The speed ratio of turbines refers to the ratio of the rotational speed of the turbine rotor to the rotational speed of the turbine shaft. This ratio is important for defining the mechanical performance and efficiency of the turbine.
How do you calculate rpm of a wind turbine?
You can calculate the rotation speed (rpm) of a wind turbine by dividing the rotational speed of the generator (usually given in revolutions per minute, or rpm) by the gear ratio of the turbine. The gear ratio is the ratio of the number of teeth on the turbine's gear to the number of teeth on the generator's gear. This formula allows you to determine the turbine's rpm based on the generator's rpm and the gear ratio.
How inefficiencies of compressor and turbine affect back work ratio and efficiency of gas turbine?
Inefficiencies in the compressor of a gas turbine cycle increase the back-work ratio and decrease the thermal efficiency of the gas turbine cycle, since they increase the compressor work.
What is jet ratio in turbine?
Jet Ratio: it is defined as the ratio of the pitch diameter (D) of the pelton turbine to the diameter of the jet (d). It is denoted by m and is given asm = D/d (=12 for most cases)
Which component when open allows engine exhaust to bypass the turbocharger turbine reducing intake pressure.?
wastegate
What is reheat factor?
It is the ratio of cumulative heat drop to isentropic heat drop in a multistage steam turbine.
What are the important parameters in brayton cycle?
The important parameters in Brayton cycle are the pressure ratio between the compressor and turbine, the efficiency of the compressor and turbine, the temperature of the gas at various points in the cycle, and the specific heat ratio of the working fluid. These parameters are crucial in determining the performance and efficiency of the Brayton cycle.
What is turbine diffuser and its pressure recovery?
Turbine diffusers are configured to improve pressure recovery within the turbo machinery. The diffuser both converts the non-uniform flow off the impeller into a uniform velocity profile and converts the dynamic energy of the flow into pressure with minimal losses. With an effective diffuser, the rotor exit static pressure will be less than the discharge value which increases the total/static pressure ratio of the turbine. With this increase in total/static pressure ratio, the total to total pressure ratio is reduced, but the overall turbine efficiency is improved.. Turbine diffusers are configured to improve pressure recovery within the turbo machinery. The diffuser both converts the non-uniform flow off the impeller into a uniform velocity profile and converts the dynamic energy of the flow into pressure with minimal losses. With an effective diffuser, the rotor exit static pressure will be less than the discharge value which increases the total/static pressure ratio of the turbine. With this increase in total/static pressure ratio, the total to total pressure ratio is reduced, but the overall turbine efficiency is improved.. For more information Read the Handbook of turbomachinery (Joseph Sherma, 2003 pg 342-348):
What is HP and LP turbine expansion?
HP Turbine is High Performance Turbine LP Turbine is Low Performance Turbine
What is power-to-weight ratio of steam turbine and gas turbine?
there is a mathematical formula to figure the actual power measured in Inchpounds of torque for both types of turbine engines. due to the light weight of the engine and the very high speeds in which they operate they are very efficient compared to other type of power plants generally the rough power to weight ratio of a typical aircraft turbine engine is around 85 to 95% output power compared to the actual weight of the type engine used.the exception to this would be a turbo-fan engine used on high speed aircraft which the power output is measured in footpounds of thrust
What is the difference between high bypass and low bypass turbofan?
The difference between the low and high bypass turbofans is simply in the amount of air which goes into the engine versus the remainder that goes around (bypasses) the engine. In high bypass engines ( an engine on any large commercial jet) only 20% around 20% of air goes into the engine with 80% bypassing it. (The 80% generates most of the engine thrust) In low bypass engines, this ratio is much lower
