scholarly journals Pressure Drop Measurements and Simulations for the Protective Mesh Screen Before the Gas Turbine Compressor

2021 ◽  
Author(s):  
L X Nie ◽  
Y Yin ◽  
L Y Yan ◽  
S W Zhou
Keyword(s):  
Pressure Drop ◽  
Gas Turbine ◽  
Reverse Flow ◽  
Fluid Velocity ◽  
Metal Mesh ◽  
Pressure Fields ◽  
Time Period ◽  
Mesh Screen ◽  
Air Intake ◽  
Gas Turbine Compressor

This paper characterizes the pressure drop of incompressible airflow when passing by a metal mesh screen which acts as a protection from sucking foreign solid matters before the gas turbine compressor. The wire diameter is 1.2mm and the mesh number is 3. Two experiments are conducted in different time period of a day to guarantee the experimental repeatability. The experimental data are used in regression analysis to obtain a quadratic correlation between the pressure drop across the screen and the fluid velocity. Numerical simulations are utilized to investigate detailed velocity and pressure fields around the wires and the Standard k-ε turbulence model is used. The results show that the fluid suffers from around 140Pa and 250Pa total pressure drop at the velocity of 20m/s and 30m/s respectively. The pressure closely upstream of the wires is as high as 4 times of the inlet flow level, while wide negative pressure regions are observed downstream of the wires resulting from fluid stagnation, reverse flow and recirculation. The empirical correlation obtained in the paper has a high confidence level and can be used in calculating the overall pressure drop of the gas turbine air intake system.

A Study of On-Line and Off-Line Turbine Washing to Optimize the Operation of a Gas Turbine

2005 ◽  
Author(s):  
Meherwan P. Boyce ◽  
Francisco Gonzalez
Keyword(s):  
Gas Turbine ◽  
Condition Monitoring ◽  
Thermal Efficiency ◽  
Heat Rate ◽  
Time Period ◽  
On Line ◽  
One Year ◽  
Gas Turbine Compressor ◽  
Isentropic Efficiency ◽  
Proper Condition

This paper highlights the procedure followed in order to establish an effective on-line and off line water wash program on a fleet of 36 small industrial turbines. To determine the efficacy of water washing a program of tests under controlled conditions was organized. With proper condition monitoring techniques, a set of tests were developed in order to identify the proper water wash frequency and the dissolving agent used to water wash. The goal of the water wash program is to maximize turbine power, and efficiency; while minimizing maintenance labor, and material. The Gas Turbine Compressor Isentropic Efficiency, the overall heat rate, and the overall thermal efficiency were used to compare the tests and evaluate the performance of different water wash frequencies and solvents. 8760 points defined each test as the data was taken over a one year time period, at a one hour interval.

Refrigerating Gas Turbine Compressor Air Intake

1981 ◽  
Author(s):  
R. M. Sadek
Keyword(s):  
Gas Turbine ◽  
Flow Rate ◽  
Compression Ratio ◽  
Gas Turbines ◽  
Air Mass ◽  
Ambient Temperatures ◽  
Air Intake ◽  
Gas Turbine Compressor ◽  
System Power ◽  
Surplus Power

Gas turbines power output is adversely influenced by increasing ambient temperatures. This is mainly caused by the reduction both in the air mass flow rate through the compressor and the developed compression ratio. It is claimed that refrigerating the compressor air intake down to 0 C, will generate enough power to cope with refrigerating system power requirements as well as leaving ample surplus power.

A Study of On-Line and Off-Line Turbine Washing to Optimize the Operation of a Gas Turbine

2005 ◽  
Vol 129 (1) ◽  
pp. 114-122 ◽  
Author(s):  
Meherwan P. Boyce ◽  
Francisco Gonzalez
Keyword(s):  
Gas Turbine ◽  
Condition Monitoring ◽  
Thermal Efficiency ◽  
Heat Rate ◽  
Water Washing ◽  
Time Period ◽  
On Line ◽  
Gas Turbine Compressor ◽  
Isentropic Efficiency ◽  
Proper Condition

This paper highlights the procedure followed in order to establish an effective on-line and off line water wash program on a fleet of 36 small industrial turbines. To determine the efficacy of water washing, a program of tests under controlled conditions was organized. With proper condition monitoring techniques, a set of tests were developed in order to identify the proper water wash frequency and the dissolving agent used to water wash. The goal of the water wash program is to maximize turbine power, and efficiency, while minimizing maintenance labor, and material. The gas turbine compressor isentropic efficiency, the overall heat rate, and the overall thermal efficiency were used to compare the tests and evaluate the performance of different water wash frequencies and solvents. 8760 points defined each test as the data were taken over a 1yr time period, at a 1h interval.

Aerodynamic limits of gas turbine compressor during high air offtakes for minimum load extension

2021 ◽  
Vol 189 ◽  
pp. 116697
Author(s):  
Artur Szymanski ◽  
Uyioghosa Igie ◽  
Kamal Abudu ◽  
Richard Hamilton
Keyword(s):  
Gas Turbine ◽  
Gas Turbine Compressor

Influence of Non-Equilibrium Fluid Properties During Fogging on Intake Duct and Compressor Characteristics

2017 ◽  
Author(s):  
Christoph Günther ◽  
Franz Joos
Keyword(s):  
Relative Humidity ◽  
Gas Turbine ◽  
Thermophysical Properties ◽  
Ambient Air ◽  
Compressor Stage ◽  
Compression Process ◽  
Fluid Properties ◽  
Temperature And Pressure ◽  
Gas Turbine Compressor ◽  
Non Equilibrium

This study reports on numerically calculated thermophysical properties of air passing through a gas turbine compressor after passage through an intake duct affected by wet compression. Case of reference is unaffected ambient air (referenced to as dry scenario) passing through intake duct and compressor. Furthermore, ambient air cooled down by (overspray) fogging (referenced to as wet scenarios) was considered. Acceleration at the end of intake duct causing reduction of static temperature and pressure results in supersaturated fluid properties at inlet to gas turbine compressor. These supersaturated fluid properties are non-equilibrium with saturation level above relative humidity of φ = 1. Entrance of supersaturated fluid into gas turbine compressor can result in condensation within first compressor stage. At the same time delayed impact of evaporative cooling influences compression process.

Derivation of signatures for faults in gas turbine compressor blading

1998 ◽  
Vol 6 (8) ◽  
pp. 969-974 ◽  
Author(s):  
N. Aretakis ◽  
K. Mathioudakis ◽  
V. Dedoussis
Keyword(s):  
Gas Turbine ◽  
Gas Turbine Compressor

Experimental Study on Flow Behavior and Heat Transfer Enhancement with Distinct Dimpled Gas Turbine Blade Internal Cooling Channel

2021 ◽  
pp. 1-28
Author(s):  
Farah Nazifa Nourin ◽  
Ryoichi S. Amano
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Heat Transfer Enhancement ◽  
Gas Turbine ◽  
Turbine Blade ◽  
Thermal Performance ◽  
Diameter Ratio ◽  
Internal Cooling ◽  
Cooling Channel ◽  
Transfer Enhancement

Abstract The study presents the investigation on heat transfer distribution along a gas turbine blade internal cooling channel. Six different cases were considered in this study, using the smooth surface channel as a baseline. Three different dimples depth-to-diameter ratios with 0.1, 0.25, and 0.50 were considered. Different combinations of partial spherical and leaf dimples were also studied with the Reynolds numbers of 6,000, 20,000, 30,000, 40,000, and 50,000. In addition to the experimental investigation, the numerical study was conducted using Large Eddy Simulation (LES) to validate the data. It was found that the highest depth-to-diameter ratio showed the highest heat transfer rate. However, there is a penalty for increased pressure drop. The highest pressure drop affects the overall thermal performance of the cooling channel. The results showed that the leaf dimpled surface is the best cooling channel based on the highest Reynolds number's heat transfer enhancement and friction factor. However, at the lowest Reynolds number, partial spherical dimples with a 0.25 depth to diameter ratio showed the highest thermal performance.

Numerical Analysis of Gas Turbine Inlet Fogging Nozzle Manifold Pressure Drop

2014 ◽  
Author(s):  
Hai Zhang ◽  
Qun Zheng ◽  
Mustapha Chaker ◽  
Cyrus Meher-Homji
Keyword(s):  
Pressure Drop ◽  
Gas Turbine ◽  
Flow Resistance ◽  
Research Effort ◽  
Water Injection ◽  
Injection Velocity ◽  
Injection Angle ◽  
Turbine Inlet ◽  
Area Of Concern ◽  
Inlet Duct

The air pressure drop over the nozzles manifolds of inlet fogging system and the flow resistance downstream of the nozzle array (manifold) have always been an area of concern and is the object of this paper. Fogging nozzles arrays (involving several hundred nozzles) are mounted on channels and beams, downstream of the inlet filters and affect the pressure drop. The water injection angle, nozzle injection velocities and the progressive evaporation of the water droplets evaporation all influence the inlet pressure seen at the gas turbine inlet. This paper focuses on a numerical simulation investigation of flow resistance (pressure drop) of inlet fogging systems. In this research effort, the inlet duct is meshed in order to compute the pressure drop over the nozzles frames in fogging and non-fogging conditions. First, the resistance coefficients of an air intake filter are obtained by numerical and experimental methods, and then the coefficients are used for the simulation of the inlet duct by considering the filter as a porous media. Effects of nozzle spread pattern and water injection pattern are then modeled. The results indicate that injection velocity and arrangement of nozzles could have significant effects on the pressure drop and intake distortion, which will affect compressor performance. This paper provides a comprehensive analysis of the pressure drop and evaporation of inlet fogging and will be of value to gas turbine inlet fogging system designers and users.

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