Heating and Efficiency Comparison of a Fischer-Tropsch (FT) Fuel, JP-8+100, and Blends in a Three-Cup Combustor Sector

2012 ◽  
Author(s):  
Anna E. Thomas ◽  
Nikita T. Saxena ◽  
Dale T. Shouse ◽  
Craig Neuroth ◽  
Amy Lynch ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Pressure Drop ◽  
Performance Data ◽  
Thermal Impact ◽  
Fischer Tropsch ◽  
Commercial Use ◽  
Turbine Efficiency ◽  
Efficiency Comparison ◽  
Inlet Conditions

In order to realize alternative fueling for military and commercial use, the industry has set forth guidelines that must be met by each fuel. These aviation fueling requirements are outlined in MIL-DTL-83133F(2008) or ASTM D 7566-Annex standards and are classified as “drop-in” fuel replacements. This paper provides combustor performance data for synthetic-paraffinic-kerosene- (SPK-) type (Fisher-Tropsch (FT)) fuel and blends with JP-8+100, relative to JP-8+100 as baseline fueling. Data were taken at various nominal inlet conditions: 75 psia (0.52 MPa) at 500 °F (533 K), 125 psia (0.86 MPa) at 625 °F (603 K), 175 psia (1.21 MPa) at 725 °F (658 K), and 225 psia (1.55 MPa) at 790 °F (694 K). Combustor performance analysis assessments were made for the change in flame temperatures, combustor efficiency, wall temperatures, and exhaust plane temperatures at 3%, 4%, and 5% combustor pressure drop (%ΔP) for fuel:air ratios (F/A) ranging from 0.010 to 0.025. Significant general trends show lower liner temperatures and higher flame and combustor outlet temperatures with increases in FT fueling relative to JP-8+100 fueling. The latter affects both turbine efficiency and blade/vane life. In general, 100% SPK-FT fuel and blends with JP-8+100 produce less particulates and less smoke and have lower thermal impact on combustor hardware.

scholarly journals Heating and Efficiency Comparison of a Fischer-Tropsch (FT) Fuel, JP-8+100, and Blends in a Three-Cup Combustor Sector

2012 ◽  
Vol 2012 ◽  
pp. 1-9
Author(s):  
Anna E. Thomas ◽  
Nikita T. Saxena ◽  
Dale T. Shouse ◽  
Craig Neuroth ◽  
Amy Lynch ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Pressure Drop ◽  
Performance Data ◽  
Thermal Impact ◽  
Fischer Tropsch ◽  
Commercial Use ◽  
Turbine Efficiency ◽  
Efficiency Comparison ◽  
Inlet Conditions

In order to realize alternative fueling for military and commercial use, industry guidelines be met. These aviation fueling requirements are outlined in MIL-DTL-83133F(2008) or ASTM D 7566-Annex standards and are classified as “drop-in” fuel replacements. This paper provides combustor performance data for synthetic-paraffinic-kerosene- (SPK-) type (Fisher-Tropsch (FT)) fuel and blends with JP8+100, relative to JP-8+100 as baseline fueling. Data were taken at various nominal inlet conditions: 75psia (0.52 MPa) at 500°F (533 K), 125 psia (0.86 MPa) at 625°F (603 K), 175 psia (1.21 MPa) at 725°F (658 K), and 225 psia (1.55 MPa) at 790 F (694 K). Combustor performance analysis assessments were made for the change in flame temperatures, combustor efficiency, wall temperatures, and exhaust plane temperatures at 3%, 4%, and 5% combustor pressure drop (%P) for fuel:air ratios (F/A) ranging from 0.010 to 0.025. Significant general trends show lower liner temperatures and higher flame and combustor outlet temperatures with increases in FT fueling relative to JP8+100 fueling. The latter affects both turbine efficiency and blade/vane life. In general, 100% SPK-FT fuel and blends with JP-8+100 produce less particulates and less smoke and have lower thermal impact on combustor hardware.

Effect of Inlet Conditions on the Pressure Drop in Confined Vortex Flow

2005 ◽  
Vol 21 (6) ◽  
pp. 1128-1133 ◽  
Author(s):  
Ali M. Jawarneh ◽  
Georgios H. Vatistas
Keyword(s):  
Pressure Drop ◽  
Vortex Flow ◽  
Inlet Conditions

Performance of a High-Solidity Wells Turbine for an OWC Wave Power Plant

1996 ◽  
Vol 118 (4) ◽  
pp. 263-268 ◽  
Author(s):  
L. M. C. Gato ◽  
V. Warfield ◽  
A. Thakker
Keyword(s):  
Experimental Investigation ◽  
Power Plant ◽  
Pressure Drop ◽  
Flow Rate ◽  
Aerodynamic Performance ◽  
Wave Power ◽  
Wells Turbine ◽  
Guide Vanes ◽  
Turbine Efficiency ◽  
Pressure Distributions

The paper describes an experimental investigation, and presents the results of the aerodynamic performance of a high-solidity Wells turbine for a wave power plant. A monoplane turbine of 0.6 m rotor diameter with guide vanes was built and tested. The tests were conducted in unidirectional steady airflow. Measurements taken include flow rate, pressure drop, torque, and rotational speed, as well as velocity and pressure distributions. Experimental results show that the presence of guide vanes can provide a remarkable increase in turbine efficiency.

Holdup and Pressure Drop in Micro Packed-Bed Reactors for Fischer-Tropsch Synthesis

2013 ◽  
Vol 85 (4) ◽  
pp. 455-460 ◽  
Author(s):  
Carsten Knobloch ◽  
Robert Güttel ◽  
Thomas Turek
Keyword(s):  
Pressure Drop ◽  
Packed Bed ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Packed Bed Reactors

Experimental Study on Characteristics of Condensation and Flow Resistance Inside Horizontal Corrugated Low Finned Tubes

2018 ◽  
Author(s):  
Bin Ren ◽  
Xiaoying Tang ◽  
Hongliang Lu ◽  
Dongliang Fu ◽  
Yannan Du ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Performance Evaluation ◽  
Heat Transfer Coefficient ◽  
Pressure Drop ◽  
Flow Resistance ◽  
Vapor Quality ◽  
Transfer Coefficients ◽  
Finned Tubes ◽  
Heat Transfer Coefficients ◽  
Inlet Conditions

It is the simplest and most feasible method to enhance heat transfer by replacing the smooth tube with various kinds of special-shaped enhanced tubes. In this paper, the characteristics of condensation and flow resistance inside horizontal corrugated low finned tubes were studied experimentally. The effects of steam inlet conditions and condensation tubes structural parameters were analyzed. The results showed that the heat transfer performance inside corrugated low finned tubes was greater than that inside smooth tubes. Like inside smooth tubes, the heat transfer coefficients increased with the vapor quality and steam mass flux. But the enhancement rate showed the opposite trend. And the heat transfer coefficients inside corrugated low finned tubes increased with the decrease of pitch and increase of protrusion height. Meanwhile, the variation trend of pressure drop gradient changing with inlet conditions and construal parameters was consistent with trend of heat transfer coefficient. The performance evaluation criteria were used to evaluate the comprehensive performance. It was found that the maximum performance evaluation factor was acquired at the minimum vapor quality and mass flux. The maximum value was 2.24 happened in the tube with pitch of 6 mm and height of 0.7mm. Finally, both the correlation for heat transfer coefficient and correlation for pressure drop gradient were developed by fitting experimental data. And this would provide calculation foundations for the design of horizontal condensers with corrugated low finned tubes.

Large Eddy Simulation of a Helical Coil Steam Generator Test Section

2017 ◽  
Author(s):  
Jonathan K. Lai ◽  
Elia Merzari ◽  
Marilyn Delgado ◽  
Samuel J. Lee ◽  
Saya Lee ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Large Eddy Simulation ◽  
Steam Generator ◽  
Test Section ◽  
Helical Coil ◽  
Reynolds Stresses ◽  
Eddy Simulation ◽  
High Heat Transfer ◽  
Large Eddy ◽  
Inlet Conditions

The helical coil steam generator (HCSG) is a compact heat exchanger that can have high heat transfer even when the pressure drop is low. This makes it advantageous in small modular reactors and high-temperature reactor designs. In order to investigate the fluid phenomena around these helical banked tubes, a test section was built at Texas A&M University to represent flow across two half-rods within HCSG. This study focuses on the validation of large eddy simulation (LES) for this particular geometry. Pressure tap and particle image velocimetry (PIV) measurements have been recorded at an inlet Reynolds number of 8643, and both mean and fluctuating data is compared with the numerical results. The highly scalable spectral-element code Nek5000 has been used to produce the LES calculations. First, simulations of varying polynomial order expansions are made to determine the spatial resolution required to capture the turbulent scales. Then, simulations with different inlet conditions are compared with experimental data. The pressure drop shows good agreement with pressure tap measurements while velocity shows similar characteristics with PIV. Furthermore, the components of the Reynolds stresses and modes from proper orthogonal decomposition have been developed to validate the physics captured.

Near-Critical CO2 Flow Measurement and Visualization

2014 ◽  
Vol 137 (1) ◽  
Author(s):  
Farzan Kazemifar ◽  
Dimitrios C. Kyritsis
Keyword(s):  
Pressure Drop ◽  
Critical Point ◽  
Flow Structure ◽  
Greenhouse Gas Emission ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Inlet Temperature ◽  
Mass Flow Rates ◽  
Inlet Conditions ◽  
Co2 Flow

Near-critical CO2 flow has been studied because of its potential application in carbon dioxide capture and sequestration, which is one of the proposed solutions for reducing greenhouse gas emission. Near the critical point the thermophysical properties of the fluid undergo abrupt changes that affect the flow structure and characteristics. Pressure drop across a stainless steel tube, 2 ft long with 0.084 in. ID, at different inlet conditions and mass flow rates have been measured. The effects of variations of inlet conditions have been studied. The results show extreme sensitivity of pressure drop to inlet conditions especially inlet temperature in the vicinity of the critical point. Also, shadowgraphs have been acquired to study the flow structure qualitatively.

scholarly journals Invalid Interpretation of Passing Sequence Data to Assess Team Performance in Football: Repairing the Tarnished Legacy of Charles Reep

2019 ◽  
Vol 12 (1) ◽  
pp. 17-21 ◽  
Author(s):  
Richard Pollard
Keyword(s):  
Performance Analysis ◽  
Team Performance ◽  
Sequence Data ◽  
Relative Effectiveness ◽  
Academic Community ◽  
Performance Data ◽  
High Profile ◽  
The Third ◽  
Methods Of Analysis ◽  
False Assumption

Background: The relative effectiveness of different styles of play at football has long been the source of heated controversy. The use of passing sequence data has recently been exploited as definitive proof that possession football is more efficient than direct play at producing goals. This has resulted in a number of high profile books, papers and websites claiming that the conclusions of Charles Reep, the founder of football performance analysis and a strong advocate of a direct style, were flawed. Objective: The first objective is to explain why passing sequence data cannot be used to give information about the relative merits of direct and possession play and hence why the recent harsh criticisms being made about Reep, his methodology and his conclusions are themselves flawed. The second objective is to review more logical and valid methods of analysis which can be used to assess the effectiveness of different tactics, strategies and playing styles. The third objective is to outline how this methodology has been put to practical and successful use for many years by a handful of performance analysts, but largely ignored by the academic community Conclusion: A short passing sequence cannot be used as a proxy for direct play. The uncritical way in which flawed conclusions based on this false assumption have multiplied has unjustly tarnished the legacy of Charles Reep. Other methods exist to examine the relative merits of different playing styles. These should be revisited, especially at a time when more and more performance data is becoming available.

Efficiency comparison and performance analysis of internally-cooled liquid desiccant dehumidifiers using LiCl and CaCl2 aqueous solutions

2020 ◽  
Vol 21 (1) ◽  
pp. 44-63
Author(s):  
Dong-gen Peng ◽  
Shun-yi Li ◽  
Dan-ting Luo ◽  
Yu-ting Fu ◽  
Xiao-song Cheng ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Aqueous Solutions ◽  
Liquid Desiccant ◽  
Internally Cooled ◽  
Efficiency Comparison ◽  
And Performance
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