Metallurgical and Fluid Dynamic Results of a 2000-Hour Endurance Test on a Two-Stage, 200-Horsepower Turbine in Wet Potassium Vapor

1967 ◽  
Author(s):  
W. F. Zimmerman ◽  
R. J. Rossbach
Keyword(s):  
Stainless Steel ◽  
Fluid Dynamic ◽  
Turbine Blades ◽  
Metal Corrosion ◽  
Test Facility ◽  
Endurance Test ◽  
Two Stage ◽  
316 Stainless Steel ◽  
Potassium Vapor ◽  
And Performance

In a potassium Rankine-cycle technology program concerned with the life and performance of turbines in wet potassium vapor, a two-stage turbine has been designed, built, and performance tested in potassium vapor up to a temperature of 1580 F. Subsequently, a 2000-hr endurance test was completed at 1500 F with the objectives of determining the relative erosion resistance of refractory blading materials, the degradation in turbine performance with erosion, if any, and the contamination effects on selected refractory alloys in a Type 316 stainless steel facility. Performance was unaffected in 2000 hr of testing. Although minor liquid-metal corrosion of turbine blades was noted, no impact erosion occurred on turbine components. Some evidence of mechanical damage by liquid-drop impact or by cavitation was observed in test-specimen inserts behind the second stage. The 2000-hr test indicated the adequacy of a Type 316 stainless steel potassium turbine test facility for development testing of space power turbines with molybdenum alloy components.

scholarly journals The Dynamics of Suspended Solid Particles in a Two Stage Gas Turbine

1986 ◽  
Author(s):  
W. Tabakoff ◽  
A. Hamed
Keyword(s):  
Flow Field ◽  
Gas Turbine ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Suspended Solid ◽  
Solid Particles ◽  
Two Stage ◽  
Particle Momentum ◽  
Performance Deterioration ◽  
And Performance

Gas turbine engines operating in dusty environments are exposed to erosion and performance deterioration. In order to provide the basis for calculating the erosion and performance deterioration of turbines using pulverized coal, an investigation is undertaken to determine the three dimensional particle trajectories in a two stage turbine. The solution takes into account the influence of the variation in the three dimensional flow field. The change in particle momentum due to their collision with the turbine blades and casings is modeled using empirical equations derived from experimental Laser Doppler Velocimetry (LDV) measurements. The results show the three dimensional trajectory characteristics of the solid particles relative to the turbine blades. The results also show that the particle distribution in the flow field are determined by particle-blade impacts. The results obtained from this study indicate the turbine blade locations which are subjected to more blade impacts and hence more erosion damage.

The Dynamics of Suspended Solid Particles in a Two-Stage Gas Turbine

1986 ◽  
Vol 108 (2) ◽  
pp. 298-302 ◽  
Author(s):  
W. Tabakoff ◽  
A. Hamed
Keyword(s):  
Flow Field ◽  
Gas Turbine ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Suspended Solid ◽  
Solid Particles ◽  
Two Stage ◽  
Particle Distributions ◽  
Performance Deterioration ◽  
And Performance

Gas turbine engines operating in dusty environments are exposed to erosion and performance deterioration. In order to provide the basis for calculating the erosion and performance deterioration of turbines using pulverized coal, an investigation is undertaken to determine the three-dimensional particle trajectories in a two-stage turbine. The solution takes into account the influence of variation in the three-dimensional flow field. The change in particle momentum due to their collision with the turbine blades and casings is modeled using empirical equations derived from experimental laser-Doppler velocimetry (LDV) measurements. The results show the three-dimensional trajectory characteristics of the solid particles relative to the turbine blades. The results also show that the particle distributions in the flow field are determined by particle–blade impacts. The results obtained from this study indicate the turbine blade locations which are subjected to more blade impacts and hence more erosion damage.

MAXIVAL MVAPM

Alloy Digest ◽  
2006 ◽  
Vol 55 (6) ◽  
Keyword(s):  
Stainless Steel ◽  
Tensile Properties ◽  
Oxide Inclusions ◽  
316 Stainless Steel ◽  
Aisi Type

Abstract Maxival MVAPM is an enhanced-machining version of AISI Type 316 stainless steel. The alloy has a specified inclusion picture to enhance machining by modifying both sulfide and oxide inclusions. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on forming and machining. Filing Code: SS-966. Producer or source: Valbruna Stainless Inc.

MAXIVAL MVAPMD2

Alloy Digest ◽  
2011 ◽  
Vol 60 (3) ◽  
Keyword(s):  
Stainless Steel ◽  
Tensile Properties ◽  
Oxide Inclusions ◽  
316 Stainless Steel ◽  
Aisi Type

Abstract Maxival MVAPMD2 is an enhanced machining version of AISI Type 316 stainless steel. The alloy has a specified inclusion picture to enhance machining by modifying both sulfide and oxide inclusions. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on forming and machining. Filing Code: SS-1086. Producer or source: Valbruna Stainless Inc..

An Enhanced Two Stage MMSE Equalizer for Coded FBMC/OQAM Systems

2019 ◽  
Vol 10 (1) ◽  
pp. 69-82 ◽  
Author(s):  
Mohammad Rizk Assaf ◽  
Abdel-Nasser Assimi
Keyword(s):  
Error Propagation ◽  
Channel Model ◽  
Error Correcting Codes ◽  
Two Stage ◽  
Probability Of Error ◽  
Second Stage ◽  
Different Types ◽  
Mmse Equalizer ◽  
And Performance ◽  
Ici Cancellation

In this article, the authors investigate the enhanced two stage MMSE (TS-MMSE) equalizer in bit-interleaved coded FBMC/OQAM system which gives a tradeoff between complexity and performance, since error correcting codes limits error propagation, so this allows the equalizer to remove not only ICI but also ISI in the second stage. The proposed equalizer has shown less design complexity compared to the other MMSE equalizers. The obtained results show that the probability of error is improved where SNR gain reaches 2 dB measured at BER compared with ICI cancellation for different types of modulation schemes and ITU Vehicular B channel model. Some simulation results are provided to illustrate the effectiveness of the proposed equalizer.

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