Land Gas Turbine Exhaust Noise

1977 ◽  
Vol 99 (4) ◽  
pp. 526-532
Author(s):  
R. A. Kantola
Keyword(s):  
Gas Turbine ◽  
Exhaust System ◽  
Separated Flow ◽  
Scale Model ◽  
Exhaust Hood ◽  
Noise Sources ◽  
Exhaust Noise ◽  
Gas Turbine Exhaust ◽  
The Individual ◽  
High Degree

An acoustic test program on a 1/7-scale model of the exhaust configuration for a General Electric MS 5000 gas turbine has been carried out. The tests were designed to isolate the noise contributions of the individual exhaust system components and to identify the additional noise due to combinations of two or more components. This model of the MS 5000 system was found to have three principal noise sources. At a high degree of turbine exit swirl all three sources appear with the most dominant due to an interaction between aft bearing support strut wakes and downstream exhaust hood turning vanes. At zero swirl the isolated turning vane noise and an exhaust hood plenum resonance are the remaining principal noise sources. A rather unexpected effect was uncovered in the course of this program; a strong reduction in the noise generation of separated flow downstream of struts and vanes was observed when a diffuser was placed immediately behind the strut or vane exit plane. This reduction in noise was much greater than could be attributed to the reduction in velocity caused by the diffuser.

scholarly journals The Effects of Scale Factor on the Aero-Thermodynamic and Infrared Radiation Performance of Naval Gas Turbine Exhaust System With Infrared Signature Suppression Device

1993 ◽  
Author(s):  
Fangyuan Zhong ◽  
Yu Dai
Keyword(s):  
Gas Turbine ◽  
Tube Wall ◽  
Exhaust System ◽  
Scale Factor ◽  
Scale Model ◽  
Exhaust Plumes ◽  
Infrared Signature ◽  
Different Dimensions ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

On the basis of scale model tests in two different dimensions of marine gas turbine exhaust system with infrared signature suppression device, and in the light of similarity analysis and simplified numerical calculation, this paper discusses the effects of scale factor on the flow (flow resistance), temperature (of air-flow and tube wall), and infrared radiant (of exhaust plumes and exhaust uptake inner wall) fields of the exhaust system, and accordingly estimates the corresponding parameters of real ship exhaust systems as well as presents the magnitude of scale factor impacts and the recommended values for selecting the scale factor.

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.

Numerical and Experimental Study on the Suppression for the Infrared Signatures of a Marine Gas Turbine Exhaust System

2000 ◽  
Author(s):  
Shaorong Zhou ◽  
Zhaohui Du ◽  
Hanping Chen ◽  
Fangyuan Zhong
Keyword(s):  
Gas Turbine ◽  
Exhaust System ◽  
Scale Model ◽  
Ir Radiation ◽  
Exhaust Duct ◽  
Ir Signature ◽  
Gas Turbine Exhaust ◽  
Control Volumes ◽  
Cooling Air ◽  
Turbine Exhaust

The flow and thermal fields within the cooling air injection device which is widely used to suppress the infrared (IR) signatures of a marine gas turbine exhaust system were studied numerically and experimentally. A turbulence near-wall model based on the wall function method was adopted. The discretization equations were derived for the control volumes when conjugate heat transfer exists at their interfaces, with the radiation heat flux at the interfaces appearing as an additional source term. The solution method of entrained velocities at the entrance of secondary flow was introduced. The distributions of temperature and static pressure on the diffuser surface, and the temperature of gas at the outlet of the exhaust duct were simulated numerically. The numerical calculated results agreed well with corresponding scale model experimental data. Lastly, the measured IR radiation distributions by scale model experiments at different view angles and various engine power settings, with and without IR signature suppression (IRSS) devices were presented.

scholarly journals Experimental and 3D CFD Investigation in a Gas Turbine Exhaust System

1998 ◽  
Author(s):  
Bijay K. Sultanian ◽  
Shinichiro Nagao ◽  
Taro Sakamoto
Keyword(s):  
Flow Field ◽  
Gas Turbine ◽  
Exhaust System ◽  
Internal Flow ◽  
Scale Model ◽  
Laser Doppler Velocimeter ◽  
Complex Flow ◽  
Full Speed ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

Both experimental and 3D CFD investigations are carried out in a scale model of an industrial gas turbine exhaust system to better understand its complex flow field and to validate CFD prediction capabilities for improved design applications. The model consists of an annular diffuser passage with struts, followed by turning vanes and a rectangular plenum with side exhaust. Precise measurements of total/static pressure and flow velocity distributions at the model inlet, strut outlet and model outlet are made using aerodynamic probes and locally a Laser Doppler Velocimeter (LDV). Numerical analyses of the model internal flow field are performed utilizing a three-dimensional Navier-Stokes (N-S) calculation method with the industry standard k-ε turbulence model. Both the experiments and computations are carried out for three load conditions: full speed no load (FSNL), full speed mid load (FSML, 57% load), and full speed full load (FSFL). Based on the overall comparison between the measurements and CFD predictions, this study concludes that the applied N-S method is capable of predicting complicated gas turbine exhaust system flows for design applications.

Experimental and Three-Dimensional CFD Investigation in a Gas Turbine Exhaust System

1999 ◽  
Vol 121 (2) ◽  
pp. 364-374 ◽  
Author(s):  
B. K. Sultanian ◽  
S. Nagao ◽  
T. Sakamoto
Keyword(s):  
Flow Field ◽  
Gas Turbine ◽  
Three Dimensional ◽  
Exhaust System ◽  
Scale Model ◽  
Laser Doppler Velocimeter ◽  
Complex Flow ◽  
Full Speed ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

Both experimental and three-dimensional CFD investigations are carried out in a scale model of an industrial gas turbine exhaust system to better understand its complex flow field and to validate CFD prediction capabilities for improved design applications. The model consists of an annular diffuser passage with struts, followed by turning vanes and a rectangular plenum with side exhaust. Precise measurements of total/static pressure and flow velocity distributions at the model inlet, strut outlet and model outlet are made using aerodynamic probes and locally a Laser Doppler Velocimeter (LDV). Numerical analyses of the model internal flow field are performed utilizing a three-dimensional Navier-Stokes (N-S) calculation method with the industry standard k-ε turbulence model. Both the experiments and computations are carried out for three load conditions: full speed no load (FSNL), full speed mid load (FSML, 57 percent load), and full speed full load (FSFL). Based on the overall comparison between the measurements and CFD predictions, this study concludes that the applied N-S method is capable of predicting complicated gas turbine exhaust system flows for design applications.

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.

Acoustic Characteristics of a Gas Turbine Exhaust Model

1974 ◽  
Vol 96 (3) ◽  
pp. 181-184 ◽  
Author(s):  
J. R. Cummins
Keyword(s):  
Gas Turbine ◽  
Acoustic Radiation ◽  
Flow Path ◽  
Scale Model ◽  
Temperature Ratio ◽  
Acoustic Characteristics ◽  
Gas Turbine Exhaust ◽  
Acoustical Data ◽  
Turbine Exhaust

To investigate the sources of acoustic radiation from a gas turbine exhaust, a one-seventh scale model has been constructed. The model geometrically scales the flow path downstream of the rotating parts including support struts and turning vanes. A discussion and comparison of different kinds of aerodynamic and acoustic scaling techniques are given. The effect of the temperature ratio between model and prototype is found to be an important parameter in comparing acoustical data.

scholarly journals Gas Turbine Exhaust System Health Management Based on Recurrent Neural Networks

Procedia CIRP ◽  
2019 ◽  
Vol 83 ◽  
pp. 630-635 ◽  
Author(s):  
Fei Zhao ◽  
Liang Chen ◽  
Tangbin Xia ◽  
Zikun Ye ◽  
Yu Zheng
Keyword(s):  
Neural Networks ◽  
Gas Turbine ◽  
Recurrent Neural Networks ◽  
Health Management ◽  
Exhaust System ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

Development of the Exhaust Systems Radiation Noise Simulation Technology

2003 ◽  
Author(s):  
Masato Sakurai ◽  
Masaki Endo ◽  
Fred Perie
Keyword(s):  
Pressure Sensors ◽  
Exhaust System ◽  
Structural Vibration ◽  
Noise Sources ◽  
Noise Radiation ◽  
Aeroacoustic Noise ◽  
Noise Simulation ◽  
Exhaust Noise ◽  
Radiation Noise ◽  
Definition Of

The purpose of this paper is to present a Finite Element method able to simulate and predict exhaust radiation noise. The simulation takes into account fluid flow pulsation, aeroacoustic noise sources; flow induced structural vibration as well as noise radiation in the far field. All those phenomena are directly calculated in a fully coupled manner. By applying measured values at the model inflow, accurate radiation noise from the exhaust system is obtained. Locations of noise sources as well as mechanisms of noise generation are clarified. The method enables the investigation of exhaust noise radiation at early development stages. The use of semiconductor pressure sensors with 1-MHz sampling as well as Laser Doppler Velocimetry contributed greatly to the measurement accuracy required for the definition of inflow conditions.

The Reduction of Low Frequency Gas Turbine Exhaust Noise: A Case Study

1996 ◽  
Author(s):  
William C. Lucas ◽  
George F. Hessler
Keyword(s):  
Gas Turbines ◽  
Low Frequency ◽  
Development Program ◽  
Exhaust System ◽  
Field Testing ◽  
Frequency Noise ◽  
Airborne Noise ◽  
Exhaust Noise ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

A well reported, industry-wide problem with simple cycle peaking gas turbines installed near residences is excessive low frequency airborne noise, sometimes termed “infrasound.” If the noise level is high enough, it can cause perceptible vibration of windows and frame buildings, and provoke an adverse response from the community. Such a situation recently occurred after construction of a four unit GT 11N1 peaking station. A team of specialists and outside consultants was formed to investigate the problem, and a development program found that a thick absorber could be effective against infrasound. This led to the design of a thick panel absorber which was installed at the rear of a 90 degree turn in the exhaust system. Field testing verified that the low frequency noise from the turbine exhaust was reduced by 5.9 and 6.7 dB in the 31.5 and 63 Hz octave bands respectively, and by 5.5 dB(C) overall.

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