The complex nature of the three-dimensional and transonic flow in large LP steam turbines, especially in the last stages, has often made it difficult in the past to introduce new
This paper will describe the measurements and numerical solutions in detail for both design and offdesign conditions. The performance and detailed flow
The original LP turbine of the BR715 engine featured "High Lift" blading, which achieved a 20-percent reduction in aerofoil numbers compared to blading with conventional levels of lift, reported in Cobley et al. (1997). This paper describes the design and test of a re-bladed LP turbine with new "Ultra High Lift" aerofoils, achieving a further
The original LP turbine of the BR715 engine featured High Lift blading, which achieved a 20-percent reduction in aerofoil numbers compared to blading with conventional levels of lift, reported in Cobley et al. (1997). This paper describes the design and test of a re-bladed LP turbine with new Ultra High Lift aerofoils, achieving a further
For more than 120 years, GE has led the industry in steam turbine technology and innovations. Today, GE''s steam turbines continue to lead the way, delivering efficiency and reliability to help ensure our customers'' success. GE''s steam turbines equip 41% of the world''s combined-cycle plants. Right now there are more than 1,000 combined
of high-pressure and low-pressure axial turbines. They investigated the pressure coefficient variations at the middle blade section of LP turbine blades. Marty [6] used both RANS and Large Eddy Simulation (LES) methods to analyze the laminar separation bubble
In aircraft engine, the main task for low-pressure turbine (LP turbine, LPT) is to drive rotational components, for example the fan or booster stages. It also can
Most nuclear power plants operate a single-shaft turbine-generator that consists of one multi-stage HP turbine and three parallel multi-stage LP turbines, the main generator and an exciter. Each LP Turbine (low
AbstractThe paper describes the flow structures on the suction surface of a highly cambered low-pressure turbine (LPT) blade (T106 profile) subjected to periodic convective wakes. A separation bubble on the rear half of the suction side of the blade was found to form under the operating condition due to the highly diffusive boundary layer.
This paper presents unsteady surface pressures measured on the suction surface of a LP turbine cascade that was subject to wake passing from a moving bar wake generator. The surface pressures measured under the laminar boundary layer upstream of the steady flow separation point were found to respond to the wake passing as expected
1950 5th St., WP AFB, OH 45433 USA. [email protected]. ABSTRACT. The performance and detailed flow physics of a highly. loaded, transonic, low-pressure turbine stage has
The steam turbine in power plant consists of three stages: High Pressure (HP) Stage. Intermediate Pressure (IP) Stage. Low Pressure (LP) Stage. After the steam has passed through the HP stage, it is returned to the boiler to re‐heat to its desired temperature although the pressure reduced substantially. The reheated steam then passes through
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
A detailed experimental investigation was conducted into the interaction of a convected wake and a separation bubble on the rear suction surface of a highly loaded low-pressure (LP) turbine blade. Boundary layer measurements, made with 2D LDA, revealed a new transition mechanism resulting from this interaction. Prior to the arrival of
OverviewMarine propulsionHistoryManufacturingTypesPrinciple of operation and designDirect driveLocomotives
In steamships, advantages of steam turbines over reciprocating engines are smaller size, lower maintenance, lighter weight, and lower vibration. A steam turbine is efficient only when operating in the thousands of RPM, while the most effective propeller designs are for speeds less than 300 RPM; consequently, precise (thus expensive) reduction gears are usually required, although nume
The recent technologies on developments and designs of LP last-stage long blades for steam turbines are explained in this chapter. Technical features of last-stage long blades are high centrifugal force, high blade speed, 3D flow, wet-steam flow, and relatively large unsteady flow forces during low-load operations.
Example 4.1. 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
Corpus ID: 124301460 Wake passing in LP turbine blades @inproceedings{Banieghbal1995WakePI, title={Wake passing in LP turbine blades}, author={Banieghbal and Eric Warren Curtis and John D. Denton and Howard P. Hodson and Ian Huntsman and Schulte
From right to left, HP turbine with two HP valves, IP turbine with two IP valves, two LP turbines and a generator are connected in a line. In accordance with increasing demands for carbon-neutrality, the number of renewable or low-carbon emission power plants using small- or medium-sized steam turbines is increasing.
LP-Turbine – Niederdruck-Dampfturbine Die meisten Kernkraftwerke betreiben einen einwelligen Turbinengenerator, der aus einer mehrstufigen Hochdruckturbine und drei parallelen mehrstufigen LP-Turbinen, einem Hauptgenerator und einem Erreger besteht. Jede LP-Turbine (Niederdruckturbine) ist normalerweise
The highest rate in the three cases lies at 7.0 × 10–10 m/s (ie, 21 mm per ture: A maximum of two cracks from the same unit were considered. This was to avoid putting too strong an empha-sis on a specific unit type. Cracks were detected in different zones of the LP disks (keyways, shrink areas, blade fixation, edges).
In the past 10–15 years, substantial effort has been spent on increasing the airfoil lift especially in aero-engine low pressure turbines. This has been attractive, since increased airfoil lift can be used for airfoil count decrease leading to weight and hardware cost reduction. The challenge with this effort consequently has been to keep the
Conclusion: The weight distribution within an LP turbine is a vital factor in achieving optimal performance, mitigating vibrations, and ensuring the longevity of the equipment. Proper weight
A dis-cussion of the GE steam turbine offering for 2-on-1, "F" technology, gas turbine, combined-cycle plants is the main focus of this paper, with emphasis placed on the structured D-11 product – the customer''s choice for delivery cycle, per-formance, reliability, and availability.
The paper describes the flow structures on the suction surface of a highly cambered low-pressure turbine (LPT) blade (T106 profile) subjected to periodic convective wakes. A separation bubble on the rear half of the suction side of the blade was found to form under the operating condition due to the highly diffusive boundary layer. Interactions
Steam turbines for nuclear power plants employ an extremely long last stage blade (LSB), with the high pressure (HP) turbine, low pressure (LP) turbine and generator arranged along a single rotor, generating up to 1,800 MW. The turbines are designed to be extremely safe and reliable with efficiency among the highest in the industry.
This makes not only the efficiency but also the weight and manufacturing cost important parameters in the design process. SFC is highly influenced by the LP turbine efficiency, the weight of the LP turbine represents over 20% of the engine weight and the cost could be up to 15% of the whole engine total cost.
Abstract and Figures. The performance and detailed flow physics of a highly loaded, transonic, low-pressure turbine stage has
A turbine map [1] shows lines of percent corrected speed (based on a reference value) plotted against the x-axis which is pressure ratio, but deltaH/T (roughly proportional to temperature drop across the unit/component entry temperature) is also often used. The y-axis is some measure of flow, usually non-dimensional flow or corrected flow, but
Most of nuclear power plants operates a single-shaft turbine-generator that consists of one multi-stage HP turbine and three parallel multi-stage LP turbines, a main generator and an exciter. HP
In the present paper, the damage and life cycle of the last-stage blades (LSB) of a 250-MW low-pressure steam turbine are predicted under low-cycle fatigue conditions. A finite element-based analysis is carried out to compute fatigue life and damage for a blade with a fir-tree root region under the loading condition of centrifugal stresses