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Bypass Valve

The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform

R. S. Amano – 1st expert on this subject based on the ideXlab platform

  • Water Spray Cooling of High-Temperature Steam Flow Through a Steam Turbine Bypass Valve Line
    Volume 3: Thermal Hydraulics; Current Advanced Reactors: Plant Design Construction Workforce and Public Acceptance, 2009
    Co-Authors: R. S. Amano

    Abstract:

    The objective of the present study is to investigate the steam flow behavior through the high-pressure turbine Bypass Valve. Efforts have mainly been directed at investigating the process of steam flow and property variations aforementioned Bypass Valve as well as to obtain correlations between the flow rate and the Valve opening ratio. Modeling of the high-pressure turbulent steam flow was performed on a three-dimensional non-staggered (co-located) grid system by employing the finite volume method and by solving the three-dimensional, turbulent, compressible Navier-Stokes, and energy equations. Through this research, numerous data have been acquired and analyzed. These efforts enable us to obtain a correlation data set for the flow rate coefficient as a function of Valve opening. One of the significant accomplishments is to use the model presented here for further improve a design of a turbine Bypass flow Valve.Copyright © 2009 by ASME

  • Flow in Duct Downstream of a Steam Turbine Bypass Valve
    ASME 2006 Power Conference, 2006
    Co-Authors: R. S. Amano

    Abstract:

    The main goal of this study is to investigate the evaporation process of a coolant (water droplets) which is injected through spray nozzles mounted on a steam turbine Bypass pipeline in a co-generator system. The study includes several important factors: (1) the effects of four elbows on the flow pattern and evaporation process of the water particles, (2) heat transfer that affects the steam temperature and also the evaporation rates, and (3) the effects of a perforated plate on the flow pattern and evaporation process. The investigation of the structure of liquid spray jets during the transition into the gaseous phase was accomplished by developing a physical model of a particle tracking technique to investigate evaporation processes of the liquid droplets in a highly turbulent flow. Through this research, numerous data have been acquired and analyzed for heat transfer mechanisms of the evaporation of the water droplets in the pipeline system along with the cooling of the steam flow. The results of the computations were verified by comparing them with theoretical models, and were shown to be quite reliable.Copyright © 2006 by ASME

  • High-Temperature and High-Pressure Steam Flow Through a Steam Turbine Bypass Valve Line
    ASME 2005 Power Conference, 2005
    Co-Authors: R. S. Amano

    Abstract:

    The objective of the present study is to investigate the steam flow behavior through the high-pressure turbine Bypass Valve. Efforts have mainly been directed at investigating the process of steam flow and property variations aforementioned Bypass Valve as well as to obtain correlations between the flow rate and the Valve opening ratio. Modeling of the high-pressure turbulent steam flow was performed on a three-dimensional non-staggered (co-located) grid system by employing the finite volume method and by solving the three-dimensional, turbulent, compressible Navier-Stokes, and energy equations. Through this research, numerous data have been acquired and analyzed. These efforts enable us to obtain a correlation data set for the flow rate coefficient as a function of Valve opening. One of the significant accomplishments is to use the model presented here for further improve a design of a turbine Bypass flow Valve.Copyright © 2005 by ASME

Deng Kang-yao – 2nd expert on this subject based on the ideXlab platform

  • Experiment on Characteristic of Bypass Valves and Regulating MAP of a Regulated Two-Stage Turbocharged Diesel Engine
    Transactions of Csice, 2012
    Co-Authors: Deng Kang-yao

    Abstract:

    Experimental study was conducted on a regulated two-stage turbocharged(R2S)diesel engine.The Bypass Valve of turbine is parallel which locates with the high pressure stage turbine,through which the boost pressure is regulated and engine performance varies.At low to middle engine speed,the R2S system improves boost level and reduces smoke emission.Torque at full load is increased when fuel rate is increased.Compared to base engine,fuel consumption reduces obviously due to combustion improvement at low to middle engine speed and middle to high load by two stages turbocharging.At middle to high engine speed,higher boost pressure does not improve combustion,on the contrary,deteriorates the pump loss.Therefore,from the economy aspect,Bypass Valve of turbine should be full opening at those operating points.Accordingly,the compressor Bypass Valve should also be opened to reduce the flow loss.Fuel consumption slightly increases due to non-optimized complex intake and exhaust system due to Bypass.

  • Experimental on Load Transit Performance of Diesel Engine with Regulated Two Stage Turbocharging System
    Transactions of Csice, 2012
    Co-Authors: Deng Kang-yao

    Abstract:

    Experimental study during load transit was conducted on a regulated two stage turbocharging(R2S) diesel engine.Transient test system of diesel engine with R2S was built.Regulating maps of R2S Bypass Valves were analyzed through the comprehensive steady-state experiment.Experimental method of load transit process was determined based on the steady-state regulating maps of Bypass Valves.Load transit performance test at same speed was conducted under three speed lines.Experimental results showed that the turbine Bypass Valve should be closed at low speed and high load.At low load,Bypass Valve was also closed to avoid the slowly rising of boost pressure and poor emissions performance.One modified regulating map was proposed to improve the response of turbocharging system of diesel engine.Meanwhile,smoke emission was improved.

G S Samuelsen – 3rd expert on this subject based on the ideXlab platform

  • power and temperature control of fluctuating biomass gas fueled solid oxide fuel cell and micro gas turbine hybrid system
    Journal of Power Sources, 2006
    Co-Authors: T Kaneko, Jacob Brouwer, G S Samuelsen

    Abstract:

    Abstract This paper addresses how the power and temperature are controlled in a biomass gas fueled solid oxide fuel cell (SOFC) and micro gas turbine (MGT) hybrid system. A SOFC and MGT dynamic model are developed and used to simulate the hybrid system performance operating on biomass gas. The transient behavior of both the SOFC and MGT are discussed in detail. An unstable power output is observed when the system is fed biomass gas. This instability is due to the fluctuation of gas composition in the fuel. A specially designed fuel controller succeeded not only in allowing the hybrid system to follow a step change of power demand from 32 to 35 kW, but also stably maintained the system power output at 35 kW. In addition to power control, fuel cell temperature is controlled by introduction and use of a Bypass Valve around the recuperator. By releasing excess heat to the exhaust, the Bypass Valve provided the control means to avoid the self-exciting behavior of system temperature and stabilized the temperature of SOFC at 850 °C.