Numerical Analysis of the Effects of Port Water Injection in a Downsized SI Engine at Partial and Full Load Operation

2022 ◽  
pp. 118060
Author(s):  
D. Lanni ◽  
E. Galloni ◽  
G. Fontana
Keyword(s):  
Numerical Analysis ◽  
Water Injection ◽  
Si Engine ◽  
Full Load ◽  
Full Load Operation

scholarly journals Performance Analysis of a Producer Gas-fuelled Heavy-duty SI Engine at Full-load Operation

2015 ◽  
Vol 82 ◽  
pp. 149-155 ◽  
Author(s):  
Paolo Gobbato ◽  
Massimo Masi ◽  
Marianna Benetti
Keyword(s):  
Performance Analysis ◽  
Producer Gas ◽  
Heavy Duty ◽  
Si Engine ◽  
Full Load ◽  
Full Load Operation

Water Injection Benefits in a 3-Cylinder Downsized SI-Engine

2019 ◽  
Author(s):  
Jayesh Khatri ◽  
Ingemar Denbratt ◽  
Petter Dahlander ◽  
Lucien Koopmans
Keyword(s):  
Water Injection ◽  
Si Engine

Numerical analysis of knock combustion with methanol-isooctane blends in downsized SI engine

Fuel ◽  
2019 ◽  
Vol 236 ◽  
pp. 394-403 ◽  
Author(s):  
Hongqing Feng ◽  
Jianan Wei ◽  
Jing Zhang
Keyword(s):  
Numerical Analysis ◽  
Si Engine

Fuel Consumption and Pollutant Emission Optimization at Part and Full Load of a High-Performance V12 SI Engine by a 1D Model

2019 ◽  
Author(s):  
Vincenzo De Bellis ◽  
Enrica Malfi ◽  
Diego Cacciatore ◽  
Antonio Aliperti ◽  
Luca Rizzi
Keyword(s):  
Fuel Consumption ◽  
High Performance ◽  
Pollutant Emission ◽  
Si Engine ◽  
Full Load ◽  
1D Model

Stabilizing a 46 MW Multistage Utility Steam Turbine Using Integral Squeeze Film Bearing Support Dampers

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Bugra Ertas ◽  
Vaclav Cerny ◽  
Jongsoo Kim ◽  
Vaclav Polreich
Keyword(s):  
Steam Turbine ◽  
Critical Speed ◽  
Stability Margin ◽  
Experimental Tests ◽  
Turbine Rotor ◽  
Squeeze Film ◽  
Full Load ◽  
Vibration Data ◽  
Full Speed ◽  
Full Load Operation

A 46 MW 5500 rpm multistage single casing utility steam turbine experienced strong subsynchronous rotordynamic vibration of the first rotor mode; preventing full load operation of the unit. The root cause of the vibration stemmed from steam whirl forces generated at secondary sealing locations in combination with a flexible rotor-bearing system. Several attempts were made to eliminate the subsynchronous vibration by modifying bearing geometry and clearances, which came short of enabling full load operation. The following paper presents experimental tests and analytical results focused on stabilizing a 46 MW 6230 kg utility steam turbine experiencing subsynchronous rotordynamic instability. The paper advances an integral squeeze film damper (ISFD) solution, which was implemented to resolve the subsynchronous vibration and allow full load and full speed operation of the machine. The present work addresses the bearing-damper analysis, rotordynamic analysis, and experimental validation through waterfall plots, and synchronous vibration data of the steam turbine rotor. Analytical and experimental results show that using ISFD improved the stability margin by a factor of 12 eliminating the subsynchronous instability and significantly reducing critical speed amplification factors. Additionally, by using ISFD the analysis showed significant reduction in interstage clearance closures during critical speed transitions in comparison to the hard mounted tilting pad bearing configuration.

Stabilizing a 46 MW Multi-Stage Utility Steam Turbine Using Integral Squeeze Film Bearing Support Dampers

2014 ◽  
Author(s):  
Bugra Ertas ◽  
Vaclav Cerny ◽  
Jongsoo Kim ◽  
Vaclav Polreich
Keyword(s):  
Steam Turbine ◽  
Critical Speed ◽  
Stability Margin ◽  
Experimental Tests ◽  
Turbine Rotor ◽  
Squeeze Film ◽  
Full Load ◽  
Vibration Data ◽  
Multi Stage ◽  
Full Load Operation

A 46 MW 5,500 rpm multistage single casing utility steam turbine experienced strong subsynchronous rotordynamic vibration of the first rotor mode; preventing full load operation of the unit. The root cause of the vibration stemmed from steam whirl forces generated at secondary sealing locations in combination with flexible rotor-bearing system. Several attempts were made to eliminate the subsynchronous vibration by modifying bearing geometry and clearances, which came short of enabling full load operation. The following paper presents experimental tests and analytical results focused on stabilizing a 46 MW 6,230kg utility steam turbine experiencing subsynchronous rotordynamic instability. The paper advances an integral squeeze film damper (ISFD) solution, which was implemented to resolve the subsynchronous vibration and allow full load and full speed operation of the machine. The present work addresses the bearing-damper analysis, rotordynamic analysis, and experimental validation through waterfall plots, and synchronous vibration data of the steam turbine rotor. Analytical and experimental results show that using ISFD improved the stability margin by a factor of 12 eliminating the subsynchronous instability and significantly reducing critical speed amplification factors. Additionally, by using ISFD the analysis showed significant reduction in interstage clearance closures during critical speed transitions in comparison to the hard mounted tilting pad bearing configuration.

Numerical Analysis of Cooling Effects of a Cylinders in Aircraft SI Engine

2014 ◽  
Author(s):  
Lukasz Grabowski ◽  
Zbigniew Czyz ◽  
Krzysztof Kruszczynski
Keyword(s):  
Numerical Analysis ◽  
Si Engine ◽  
Cooling Effects
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