scholarly journals Flow Distribution in a Model Recuperator of an Intercooled-Recuperative Marine Gas Turbine

1990 ◽  
Author(s):  
Robert A. Uhlig ◽  
Robert L. Kiang ◽  
Janet L. Buyer
Keyword(s):  
Gas Turbine ◽  
Power Level ◽  
Flow Distribution ◽  
Brayton Cycle ◽  
Velocity Measurements ◽  
Turbine Engine ◽  
Flow Through ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust ◽  
Engine Power

An intercooled-recuperative Brayton cycle is known to have a significantly higher thermal efficiency and hence a lower specific fuel consumption. The success of an ICR gas turbine engine, however, depends heavily on the performance of the recuperator. Uniform flow leading into the recuperator is usually assumed in the recuperator design. This experimental work represents an initial effort to understand and to improve the flow distribution in a marine gas turbine exhaust diffuser/recuperator configuration. Velocity measurements immediately downstream of the recuperator show that the flow through the recuperator is nonuniform; but the nonuniform flow distribution remains invariant with respect to the engine power level.

scholarly journals Comparisons of Recuperator Flow Distributions of an Intercooled-Recuperative Marine Gas Turbine

1992 ◽  
Author(s):  
Robert L. Kiang ◽  
Janet L. Buyer ◽  
Robert A. Uhlig
Keyword(s):  
Gas Turbine ◽  
Gas Flow ◽  
Complex Geometry ◽  
Power Level ◽  
Brayton Cycle ◽  
Exhaust Gas ◽  
Turbine Engine ◽  
Flow Through ◽  
Full Power ◽  
Engine Power

An intercooled-recuperative Brayton cycle is known to have a significantly higher thermal efficiency than a simple Brayton cycle. The success of an ICR gas turbine engine, however, depends in part on the performance of the recuperator. A uniform flow leading into the recuperator is usually assumed in the recuperator design. The complex geometry of the exhaust diffuser, which is located upstream of the recuperator, suggests that the flow may not be uniform. This study is an experimental investigation into the uniformity of flow through two specific exhaust diffuser/recuperator designs. It is found that the flow is nonuniform, but the nonuniformity is mostly invariant with respect to the exhaust gas flow rate, or equivalently, the engine power level between 25% and 50% full power.

A Unique Approach to HRSG Bypass Dampers

1996 ◽  
Author(s):  
David T. Ryan ◽  
Judith A. Veatch ◽  
Akber Pasha
Keyword(s):  
Gas Turbine ◽  
Flow Distribution ◽  
Soft Start ◽  
Sealing Performance ◽  
Unique Approach ◽  
Control Capability ◽  
Damper Design ◽  
Gas Turbine Exhaust ◽  
Controlled Flow ◽  
Turbine Exhaust

‘Soft’ start flow distribution, control capability, sealing performance, and safety, were four reasons Oklahoma Municipal Power Authority (OMPA), in cooperation with Black & Veatch and Vogt, installed Dual BiPlane Heat Recovery Steam Generator (HRSG) Isolation and Bypass Dampers from Damper Design, Inc. on the gas turbine outlet at this facility. The DDI BiPlane damper is truly a unique damper for this application. This design allowed OMPA to have the safety and isolation of a flap diverter white providing the even gas distribution and accurate flow control to the HRSG under startup conditions available from a louver style damper. The arrangement consists of two DDI BiPlane dampers, one on the inlet to the HRSG and one isolating the stack. Since safety is highest priority, Damper Design utilized an independent lockout type linkage that allows control of the dampers while positively preventing the closure of both gas paths at the same time. By installing the DDI BiPlane damper, OMPA has the ability to throttle the gas turbine exhaust flow independently to the HRSG and stack. This allows the gases to enter the HRSG with a much more evenly distributed flow pattern and at lower controlled flow rates than with competing designs. This paper will address the benefits, design, and operating advantages of the use of the DDI BiPlane Damper specifically in HRSG isolation and bypass installations. It is also applicable to other systems where control and isolation with one damper is desirable.

An Experimental Analysis of Flow Through Annular Diffuser With and Without Struts

2006 ◽  
Author(s):  
R. Prakash ◽  
P. Sudhakar ◽  
N. V. Mahalakshmi
Keyword(s):  
Gas Turbine ◽  
Static Pressure ◽  
Structural Members ◽  
Pressure Development ◽  
Annular Diffuser ◽  
Fundamental Research ◽  
Flow Through ◽  
Gas Turbine Exhaust ◽  
Industrial Gas Turbine ◽  
Turbine Exhaust

This paper presents the static pressure development and the effect of struts on the performance of an annular diffuser. A typical exhaust diffuser of an industrial gas turbine is annular with structural members, called struts, which extend radially from the inner to the outer annulus wall. An annular diffuser model, primarily intended for fundamental research, has been tested on a wind tunnel. Similar conditions that prevail in an industrial gas turbine have been generated in the diffuser. Measurements were made using a five holed Pitot probe. The research had been carried out to make a detailed investigation on the effect of struts and to advance computational and design tools for gas turbine exhaust diffusers.

Flow Guiding and Distributing Devices on the Exhaust Side of Stationary Gas Turbines

1990 ◽  
Vol 112 (1) ◽  
pp. 80-85
Author(s):  
F. Fleischer ◽  
C. Koerner ◽  
J. Mann
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Gas Flow ◽  
Flow Simulation ◽  
Exhaust System ◽  
Flow Distribution ◽  
Scale Model ◽  
Gas Turbine Exhaust ◽  
First Time ◽  
Turbine Exhaust

Following repeated cases of damage caused to exhaust silencers located directly beyond gas turbine diffusers, this paper reports on investigations carried out to determine possible remedies. In all instances, an uneven exhaust gas flow distribution was found. The company’s innovative approach to the problem involved constructing a scale model of a complete gas turbine exhaust system and using it for flow simulation purposes. It was established for the first time that, subject to certain conditions, the results of tests conducted on a model can be applied to the actual turbine exhaust system. It is shown that when an unfavorable duct arrangement might produce an uneven exhaust flow, scale models are useful in the development of suitable flow-distributing devices.

Laser Raman and Fluorescence Measurements Applied to Gas Turbine Exhaust Emissions

1975 ◽  
Author(s):  
D. A. Leonard ◽  
P. M. Rubins
Keyword(s):  
Gas Turbine ◽  
Optical Method ◽  
Exhaust Emissions ◽  
Exhaust Emission ◽  
Emission Analysis ◽  
Turbine Engine ◽  
Laser Raman ◽  
Fluorescence Measurements ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

The problems of gas turbine exhaust gas sampling by presently approved methods make an optical method attractive. Because of this, the Air Force has sponsored the development of laser. Raman for exhaust emissions measurement. Laser induced Raman and fluorescent measurements were made in the exhaust of a T53-L-13A gas turbine engine with a new field-portable instrument devised specifically for gas turbine exhaust emission measurements. The gas turbine exhaust was analyzed by conventional instruments for CO, CO2, NO, NOx total hydrocarbons, smoke, and temperature, and these data were used as a comparative standard for the evaluation of the laser Raman instrument. Results thus far indicate good to excellent correlations for CO2, O2, smoke, hydrocarbons, and temperature. NO detection was not sensitive enough, but the data analysis indicates that 100 ppm or less may be detectable with instrument improvements. Further NO sensitivity is possible with continued development of the method. CO analysis was not attempted, but it is expected that CO could be detected with further research. NO2 was not attempted because theoretical and experimental laboratory analysis indicated severe interferences with CO2. Temperature profiles from laser Raman were also compared with thermocouple data in the exhaust stream, and showed agreement within the radiation error of the thermocouples. With further development, laser Raman shows a good potential for an optical method of aircraft gas turbine emission analysis.

scholarly journals Intercooled and Brayton Cycle Gas Turbines for Steam Power Plant Hot Windbox Repowering

1998 ◽  
Author(s):  
G. Negri di Montenegro ◽  
M. Gambini ◽  
A. Peretto
Keyword(s):  
Power Plant ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Brayton Cycle ◽  
Steam Power ◽  
Steam Power Plant ◽  
Higher Power ◽  
Flow Rate Range ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

In the present paper the performance of a hot windbox repowering steam power plant are evaluated. A methodology has been developed to determine the mass flow rate range of gas turbine exhaust gas injected into a steam generator of an existing steam power plant. The study allowed to evaluate the performance of the repowered plant for different gas turbine available on the market. By utilizing the same methodology, this repowering solution was also investigated employing an intercooler gas turbine that, in the state of art, may be realistically proposed. It resulted that the hot windbox repowering with Brayton cycle gas turbine supplies a considerably higher power output and efficiency than those of the steam power plant before the repowering. The employing of an intercooled gas turbine provides further improvements of power and efficiency with respect to the repowered plant using the Brayton cycle gas turbine.

Cast Iron-Nickel Alloy for Industrial Gas Turbine Engine Applications

2005 ◽  
Author(s):  
Jeffrey R. Neyhouse ◽  
Jose M. Aurrecoechea ◽  
J. Preston Montague ◽  
John D. Lilley
Keyword(s):  
Gas Turbine ◽  
Ductile Iron ◽  
Gas Turbine Engine ◽  
Austenitic Steels ◽  
Nickel Steel ◽  
Turbine Engine ◽  
Gas Turbine Exhaust ◽  
Nodular Graphite ◽  
Industrial Gas Turbine ◽  
Turbine Exhaust

Austenitic ductile iron castings have traditionally been used for gas turbine exhaust components that require castability, good machinability, low thermal expansion, and high strength at elevated temperatures. The achievement of optimum properties in austenitic ductile irons hinges on the ability of the foundry to produce nodular graphite in the microstructure throughout the component. In large, complex components, consistently producing nodular graphite is challenging. A high-nickel steel alloy that is suitable for sand castings has been recently developed for industrial gas turbine engine applications. The alloy exhibits similar mechanical and physical properties to austenitic ductile irons, but with improved processability and ductility. This alloy is weldable and exhibits no secondary graphite phase. This paper presents the results of a characterization program conducted on a 35% nickel, high-alloy steel. The results are compared with an austenitic ductile iron of similar composition. Tensile and creep properties from ambient temperature to 760°C (1400°F) are included, along with fabrication experience gained during the manufacture of several sand cast components at Solar Turbines Incorporated. The alloy has been successfully adopted for gas turbine exhaust system components and other applications where austenitic ductile irons have traditionally been utilized. The low carbon content of austenitic steels permits improved weldabilty and processing characteristics over austenitic ductile irons. The enhancements provided by the alloy indicate that additional applications, as both austenitic ductile iron replacements and new components, will arise in the future.

Analysis of Using the M-Cycle Regenerative-Humidification Process on a Gas Turbine

2014 ◽  
Author(s):  
P. E. Jenkins ◽  
M. Cerza ◽  
Mohammad M. Al Saaid
Keyword(s):  
Gas Turbine ◽  
System Performance ◽  
Gas Turbine Engine ◽  
Brayton Cycle ◽  
Test Results ◽  
Turbine Engine ◽  
Performance Curves ◽  
Air Cooler ◽  
Net Power Output ◽  
Turbine Exhaust

This investigation focused on the analysis of using the Maisotsenko Cycle (M-Cycle) to improve the efficiency of a gas turbine engine. By combining the Maisotsenko Cycle (M-Cycle) with an open Brayton cycle, a new cycle, is known as the Maisotsenko Combustion Turbine Cycle (MCTC), was formed. The MCTC used an Indirect Evaporative Air Cooler as a saturator with a gas turbine engine. The saturator was applied on the side of the turbine exhaust (M-Cycle#2) in the analysis. The analysis included calculations and the development of an Engineering Equation Solver (EES) code to model the MCTC system performance. The resulting performance curves were graphed to show the effects of several parameters on the thermal efficiency and net power output of the gas turbine engine. The models were also compared with actual experimental test results from a gas turbine engine. Conclusions and discussions of results are also given.

scholarly journals Flow Guiding and Distributing Devices on the Exhaust Side of Stationary Gas Turbines

1989 ◽  
Author(s):  
Friedrich Fleischer ◽  
Christian Koerner ◽  
Juergen Mann
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Gas Flow ◽  
Flow Simulation ◽  
Exhaust System ◽  
Flow Distribution ◽  
Scale Model ◽  
Gas Turbine Exhaust ◽  
First Time ◽  
Turbine Exhaust

Following repeated cases of damage caused to exhaust silencers located directly beyond gas turbine diffusers, this paper reports on investigations carried out to determine possible remedies. In all instances, an uneven exhaust gas flow distribution was found to be present. The company’s innovative approach to the problem involved constructing a scale model of a complete gas turbine exhaust system and using it for flow simulation purposes. It was established for the first time that, subject to certain conditions, the results of tests conducted on a model can be applied to the actual turbine exhaust system. It is shown that when an unfavourable duct arrangement might produce an uneven exhaust flow, scale models are useful in the development of suitable flow-distributing devices.

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