Relevant bibliographies by topics / Turbine Bypass Valve

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Turbine Bypass Valve'

Author: Grafiati
Published: 10 March 2023

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Journal articles on the topic "Turbine Bypass Valve"

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Zou, Z., M. Yang, S. Zhou, Z. Ding, Y. Tian, and K. Deng. "Investigation of inter-stage passive flow control for turbine performance improvement on regulated two-stage turbocharger." Journal of Physics: Conference Series 2217, no. 1 (April 1, 2022): 012078. http://dx.doi.org/10.1088/1742-6596/2217/1/012078.

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Abstract The flow field coupling effect between the HPT (high pressure turbine) and LPT (low pressure turbine) introduces a particular flow structure to the two-stage turbocharging system. Compared to the isolated turbines, the performance of these two connected turbines will inevitably be affected by each other. However, in the open state of the bypass valve, the influence of the bypass flow on this flow field coupling effect is still unknown. In this study, the inter-stage performance interaction of regulated two-stage turbocharger was investigated through the three-dimensional numerical method. With the bypass valve open, the influence of different positions of the bypass branch on the inter-stage coupling effects is investigated. The results manifest that the different positions of the bypass branch significantly change the performance of low pressure turbine and the flow interactions within the inter-stage. When the bypass branch is on the right, the LPT efficiency improves by approximately 2.2%. The detailed flow field analysis of the inter-stage pipe, volute and rotor is conducted to reveal the flow mechanism behind the inter-stage interactions. Based on this investigation, a new passive flow control scheme is proposed to ameliorate the swirling flow at the LPT inlet and improve the performance of LPT.
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Gregory, Brent A., and Oleg Moroz. "Gas Turbine Cooling Flows and Their Influence in Output." Mechanical Engineering 137, no. 03 (March 1, 2015): 48–54. http://dx.doi.org/10.1115/1.2015-mar-4.

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This article presents the importance of understanding cooling flow monitoring especially when applied to land-based gas turbines. Cooling flows are necessary for the engine to function; however, too much cooling has a negative impact on the performance and output. Strategically placed instrumentation in the cooling flow delivery system can monitor the health and hence the output of the gas turbine generator utilized in a simple or combined cycle operation. In order to monitor cooling flows, a good approach is to look at disc cavity temperatures as well as bypass valve positions. It is best to trend both bypass valve position and disc cavity temperatures over a range of temperatures and engine load operation to get a better idea if the orifice plates in the main lines are sized properly. A quick way to determine whether there are cooling issues in an engine or not is to trend disc cavity temperature and bypass valve positions {AQ: Edits have been made in this sentence “A quick…valve positions.” for better readability. Please check and correct if necessary.}
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Amano, R. S., and G. R. Draxler. "High-Pressure Steam Flow in Turbine Bypass Valve System Part 1: Valve Flow." Journal of Propulsion and Power 18, no. 3 (May 2002): 555–60. http://dx.doi.org/10.2514/2.5996.

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Mantelli, Luca, David Tucker, and Mario Luigi Ferrari. "Dynamic Effect of Cold-Air Bypass Valve for Compressor Surge Recovery and Prevention in Fuel Cell Gas Turbine Hybrid Systems." E3S Web of Conferences 113 (2019): 02014. http://dx.doi.org/10.1051/e3sconf/201911302014.

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A large volume between compressor and turbine is present in fuel cell gas turbine hybrid systems. The substantially larger compressor plenum volume modifies the dynamic behaviour of these systems, increasing the risk of compressor surge during transients and subsequent destruction of both turbomachinery and fuel cell components. Diverting part of the compressor inlet flow directly to the turbine inlet through a cold-air bypass valve, bypassing the fuel cell stack, has been proven to be an effective method to increase the surge margin during normal operation and also to recover the machine from fully developed surge. This study investigates the dynamic effect of different cold-air bypass valve opening/closing procedures, especially steps and ramps changing the valve fractional opening. This analysis was carried out with reference to the Hybrid Performance (Hyper) facility: a hybrid system emulated using hardware and a cyber-physical fuel cell system at the National Energy Technology Laboratory (NETL), U.S. Department of Energy (DOE). Simulations performed on a Matlab®-Simulink® dynamic model of the system based on Greitzer’s theory showed a different behaviour varying the valve fractional opening with steps or ramps. Many experimental tests were performed on the Hyper facility to confirm the trends obtained from the simulations results. From the outcomes of this study, it has been possible to determine how to maximize the surge recovery effect of the cold-air bypass valve opening and to minimize surge related risks during the valve closure.
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Fang, Guo Cheng, Shi Da She, Zhen Qi Ye, Ji Zhang, Lai Wei, Qiang Wang, Xiang Qun Zhang, and Yong Yun Ding. "Analysis and Application of Turbine Outages Kept Boiler of FCB Function in the Philippines Mariveles Power Plant." Applied Mechanics and Materials 668-669 (October 2014): 661–64. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.661.

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This paper mainly introduces the system configuration of the Philippines Mariveles power plant, the difficulty and key points of the unit fast cut load (Fast Cut Back - FCB) control function were analyzed, and the boiler pressure control valve (Pressure Controlling Valve - PCV) discharge, turbine bypass opening coordination decrease pressure, integrate the override control, a fixed value servo and other control strategy, the possible problems in the process of test are sorting and analysis, and put forward effective solution, ensure the successful application of turbine outages kept boiler of FCB function, lay solid foundation for the safe and stable operation of the power grid.
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Mazur, Z., G. Urquiza, and R. Campos. "Improvement of the Turbine Main Stop Valves with Flow Simulation in Erosion by Solid Particle Impact CFD." International Journal of Rotating Machinery 10, no. 1 (2004): 65–73. http://dx.doi.org/10.1155/s1023621x04000077.

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The flow field in a steam turbine main stop valve bypass valve (MSVBV) has been investigated by means of CFD simulations. Because the entire flow to the turbine during start ups is carried by the MSVBV it is subject to serious solid particle erosion problems and requires frequent replacement to avoid the catastrophic damage which can occurred when the MSVBV skirt eroded through causing large pieces of metal to be carried directly into the turbine. For some of the most important geometric parameters of the MSVBV, design recommendation have been made.
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Pugi, Luca, Emanuele Galardi, Carlo Carcasci, and Nicola Lucchesi. "Hardware-in-the-loop testing of bypass valve actuation system: Design and validation of a simplified real time model." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 231, no. 2 (August 3, 2016): 212–35. http://dx.doi.org/10.1177/0954408915589513.

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During the start-up and shut-down phases of steam power plants many components are subjected to pressure and temperature transients that have to be carefully regulated both for safety and reliability reasons. For this reason, there is a growing interest in the optimization of turbine bypass controllers and actuators which are mainly used to regulate the plant during this kind of operations. In this work, a numerically efficient model for real-time simulation of a steam plant is presented. In particular, a modular Simulink™ library of components such as valves, turbines, and heaters has been developed. In this way, it is possible to easily assemble and customize models able to simulate different plants and operating scenarios. The code, which is implemented for a fixed, discrete step solver, can be easily compiled for a RT target (such as a Texas Instrument DSP) in order to be executed in real time on a low-cost industrial hardware. The proposed model has been used for quite innovative applications such as the development of a hardware-in-the-loop test rig of turbine bypass controllers and valve positioners. Preliminary experimental activities and results of the proposed test rig developed for Velan ABV are introduced and discussed.
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Amano, R. S., G. R. Draxler, and J. M. Golembiewski. "High-Pressure Steam Flow in Turbine Bypass Valve System Part 2: Pipe Flow." Journal of Propulsion and Power 18, no. 3 (May 2002): 561–71. http://dx.doi.org/10.2514/2.5997.

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Kwon, W. C., G. R. Kim, S. C. Park, and J. Y. Yoon. "Design of a tortuous path trim for a high-pressure turbine bypass valve." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 224, no. 2 (February 4, 2010): 149–53. http://dx.doi.org/10.1243/09544089jpme316.

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Theotokatos, G., and N. P. Kyrtatos. "Investigation of a Large High- Speed Diesel Engine Transient Behavior Including Compressor Surging and Emergency Shutdown." Journal of Engineering for Gas Turbines and Power 125, no. 2 (April 1, 2003): 580–89. http://dx.doi.org/10.1115/1.1559903.

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The operation of a large high-speed engine under transient loading conditions was investigated, using a detailed simulation code in conjunction with a model capable of predicting compressor surging. Engine loadings were applied, which were considered dangerous for initiating compressor surging and cases where compressor surging could occur were identified. A means of avoiding compressor surging by opening a bypass valve connected between the compressor outlet and turbine inlet was examined. Finally, the case of engine abrupt stopping by rapidly closing the engine emergency shutdown valve, located downstream of the compressor, was also investigated.
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Dissertations / Theses on the topic "Turbine Bypass Valve"

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Podešva, Adam. "Použití běžného odstředivého čerpadla jako turbíny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444636.

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This work deals with the use of a centrifugal pump in turbine mode and control of the system where this machine is operated. The introduction describes and divides the various types of pumps and discusses the issue of Euler's pump and turbine equations. The flow control options are also described here. Part of the work is a research that examines the advantages and disadvantages of using a centrifugal pump in turbine mode, the possibilities of using this system and real applications in the Czech Republic and in the world. The main part is the design of a mathematical model in Microsoft Excel, which solves the regulation of the piping system with a pump operating in turbine mode, especially out of the optimal operating parameters.
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Pranoto, Bayu, and 尤卞藤. "Performance characteristic modeling of hybrid proton conducting solid oxide fuel cell (pSOFC) and micro gas turbine (MGT) system using a double bypass valve for heat management." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/20543560654441914584.

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碩士
國立中央大學
機械工程學系
104
Abstract Conducting Proton-Solid Oxide Fuel Cell (pSOFC), by attaching Micro Gas Turbine (MGT) is oneof the outstanding hybrid system nowadays. The intermediate temperature of pSOFC (around 700 – 800 [0C])is used to raise the performance of micro gas turbine in apower plantsystem. pSOFC has a lower temperature characteristic than old type of SOFC, which can afford more rapid start up/down and improve durability. A new model is proposed in the research based on themodels developed by earlier researchers.The proposed hybrid system is simulated using Matlab-Simulink. Simulations were performed to study the behavior of the pSOFC-MGT hybrid system by changing respective parameters such as pressure, steam to carbon ratio, and fuel utilization.In our research, we proposed, three different configurations by changing the bypass position in my proposed system i.e., with placing the bypass(i) after the combustor, (ii) after turbine, and (iii) after the combustor and turbine. The results show that the higher operating pressure will reduce system efficiency for configuration 1 and 2, and increase the efficiency for configuration 3. The effect of raising Steam to Carbon Ratio will reduce the efficiency of configuration 1 for anoperating pressure of 1 – 2 [bar], but it increasesthe efficiency of configuration 2 and configuration 3. The higherfuel utilization will increase the efficiency for all configurations. For bypass ratio variation, increase in bypass ratio will increase the efficiency of all configurations. Considering all the results ofconfiguration 3 provide the best performance compared to configuration 1 and 2 in all three models. The efficiencies of configuration 1, configuration 2, and configuration 3 are 49%, 63%, and68% respectively. The study obtained that using the overall heat exchanger over 5 W/K will not give an effect to configuration 3 performance so much. The cost analysis can be taken into consideration bychoosing an appropriate device to build a configuration 3 model. The exergy analysis has a same tendency with energy analysis, but it will different in value. Due to the exergy destruction during the process, the value of energy is higher than exergy. To know an amount of exergy destruction, it carried out thecalculations based on the amount of entropy generation and found the devices that have lost exergy from the largest to the smallest in a sequence is combustor 60.2[kW], pSOFC 22.8 [kW] Compressor 21.7 [kW], Pump 5.5 [kW], Fuel Heater 0.9 [kW], reformer 0.7 [kW], water heater 0.4 [kW], air heater 0.23 [kW], and MGT 0.21 [kW]. Keywords: Proton-Conducting Solid Oxide Fuel Cell (pSOFC), Micro Gas Turbine (MGT), Matlab-Simulink, Hybrid configuration mode
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GALARDI, EMANUELE. "Development of Innovative Modelling, Real Time and Hardware In the Loop Techniques for Industrial Systems." Doctoral thesis, 2017. http://hdl.handle.net/2158/1080941.

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Hardware In the Loop (HIL) simulations are testing tools that have been widely applied in recent years for the design and testing of components and systems. In particular, a part of the real environment is inserted in the simulation loop. The HIL architecture, whose nature results partly physical and partly simulated, is employed to test a component or system in Real Time (RT). The continuous development of technologies for the fast prototyping of RT code has contributed to speed up the diffusion of complex HIL testing techniques. However, this approach still appears to be poorly followed in the energy field where, concerning the study of complex plants, the accurate modelling of these systems results in high computation times that are not acceptable for RT simulations. Therefore, the thesis focused on the development of innovative techniques for the modelling, RT and HIL testing of industrial systems, which aimed at obtaining the best compromise between accuracy and efficiency. In particular, the proposed strategies have been applied in two distinct test cases. The first one concerns with the development of both an efficient model of a turbo-machinery auxiliary plant and of a suitable RT control system for the execution of functional tests procedure on a real plants. The second one aimed at developing an innovative control system for Turbine Bypass Valves (TBVs) through HIL tests performed on a dedicated test rig. The research work has been executed by the Section of Applied Mechanics from the Department of Industrial Engineering of the University of Florence in collaboration with General Electric S.p.A and Velan ABV S.p.A, which provided the required tools and experimental data.
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Conference papers on the topic "Turbine Bypass Valve"

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Logar, Andreas, Thomas Depolt, and Edwin Gobrecht. "Advanced Steam Turbine Bypass Valve Design for Flexible Power Plants." In 2002 International Joint Power Generation Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ijpgc2002-26071.

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The authors company has had extensive experience providing steam turbines including auxiliary systems as a turn key contractor for more than 40 years. Bypass systems are an integrated part of modern Combined Cycle Power Plants (CCPP) [1]. Bypass systems contribute a major part for operational flexibility. They allow the shortest start-up times by minimising mismatches between boiler/HRSG and turbine. Bypass systems also lead to predictable and repeatable start-up times, as well as reducing solid particle erosion of component, to a great extent. The functional requirements for bypass valves are: • Control mode for an accurate control of the IP and LP bypass steam flow during the unit start-up and shut-down, as well as during normal operating transients. • Fast closing mode for bypass-trip (supported by spring force) when required for condenser protection. • Combined mode for fast reaction on pressure increase to a define set point and further action in control mode. In the past, a combined stop and control valve design, each with a separate stem, was common. The challenging objective for the bypass valve design was to integrate the control function and the trip function with a single stem design. The authors company has developed this advanced steam turbine bypass valve that incorporates hydraulic actuator with a single stem design. The valve bodies have noise reduction fittings and are equipped with large extensions on the outlet side to reduce vibration throughout the bypass system. The bypass valve body has an integrated steam strainer which protects both valve parts and the condenser from external debris. The bypass design is prepared for Power Plants with elevated temperatures which allow for the highest plant efficiencies [2]. Surface coating protect moving components against oxidation and reduce friction by means of a surface coating. Steam at high temperature passes through the bypass to the condenser. An incorporated water attemporating flow control system reduces the steam temperatures before entering the condenser. Condensate water is injected through an orifice in the bypass system. The orifice is located down stream in the pipe between the bypass valve and condenser. Electro-hydraulic supply units deliver the control fluid to the bypass valves. An optimized bypass system has to provide: • Long service life with low maintenance costs; • High stroke speed; • Pressure control by unit set point; • High actuation forces; • Accurate positioning; • Very short trip time into closed position. By means of bypass station, one can get highest flexibility of power plants use of the new valve one will get highest control performance and shortest reaction time.
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Amano, R. S. "Flow in Duct Downstream of a Steam Turbine Bypass Valve." In ASME 2006 Power Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/power2006-88021.

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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.
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Yang, Wenze, Xuan Jiang, Kunming Cheng, Jin Li, Yitao Huang, Lei Zhang, Hongtai Zhang, Jun Zhou, and Wei Yuan. "Influence mechanism of Valve opening on flow field stability of bypass valve of conventional island Steam Turbine." In 2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM). IEEE, 2022. http://dx.doi.org/10.1109/wcmeim56910.2022.10021571.

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Amano, R. S. "High-Temperature and High-Pressure Steam Flow Through a Steam Turbine Bypass Valve Line." In ASME 2005 Power Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pwr2005-50194.

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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.
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Amano, R. S. "Water Spray Cooling of High-Temperature Steam Flow Through a Steam Turbine Bypass Valve Line." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75017.

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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.
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Nakata, T., M. Sato, T. Ninomiya, T. Abe, S. Mandai, and N. Sato. "Experimental Evaluation of a Low NOx LBG Combustor Using Bypass Air." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-380.

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A 150-MW, 1300°C (1573 K) class gas turbine combustor firing coal-gasified fuel has been designed. Main purpose of the present paper is first to estimate CO and NOx emissions, and second to discuss the low NOx combusion technology burning such a low-BTU gas. The full-scale, atmospheric-pressure combustion tests were conducted over a wide range of conditions using bypass air. The results are summarized as follows: (1) A designed combustor has an excellent combustion efficiency of 99.6 percent even when the calorific value of fuel drops to 650 kcal/m3N. (2) CO and NOx emissions can be estimated by the air ratio in primary combustion zone. (3) The role of air bypass valve is important for low NOx combustion, and to give stable combustion at lower load conditions. (4) Ammonia conversion to NOx is minimized with a optimum air ratio in primary combustion zone.
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Emami, Tooran, Alex Tsai, and David Tucker. "Robust PID Controller Design of a Solid Oxide Fuel Cell Gas Turbine." In ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2016 Power Conference and the ASME 2016 10th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fuelcell2016-59602.

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The performance of a 300 kW Solid Oxide Fuel Cell Gas Turbine (SOFC-GT) pilot power plant simulator is evaluated by applying a set of robust Proportional Integral Derivative (PID) controllers that satisfy time delay and gain uncertainties of the SOFC-GT system. The actuators are a fuel valve (FV) that models the fuel cell thermal exhaust, and a cold-air (CA) valve which bypasses airflow rate from the fuel cell cathode. The robust PID controller results for the uncertain gains are presented first, followed by a design for uncertain time delays for both, FV and CA bypass valves. The final design incorporates the combined uncertain gain parameters with the time delay modeling of both actuators. This Multiple-Input Multiple-Output (MIMO) technique is beneficial to plants having a wide range of operation and a strong parameter interaction. The practical implementation is presented through simulation in the Matlab/Simulink environment.
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Pezzini, Paolo, Sue Celestin, and David Tucker. "Control Impacts of Cold-Air Bypass on Pressurized Fuel Cell Turbine Hybrids." In ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2014 8th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fuelcell2014-6523.

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A pressure drop analysis for a direct-fired fuel cell turbine hybrid power system was evaluated using a hardware-based simulation of an integrated gasifier/fuel cell/turbine hybrid cycle (IGFC), implemented through the Hybrid Performance (Hyper) project at the National Energy Technology Laboratory, U.S. Department of Energy (NETL). The Hyper facility is designed to explore dynamic operation of hybrid systems and quantitatively characterize such transient behavior. It is possible to model, test and evaluate the effects of different parameters on the design and operation of a gasifier/fuel cell/gas turbine hybrid system and provide means of evaluating risk mitigation strategies. The cold air bypass in the Hyper facility directs compressor discharge flow to the turbine inlet duct, bypassing the fuel cell and exhaust gas recuperators in the system. This valve reduces turbine inlet temperature while reducing cathode airflow, but significantly improves compressor surge margin. Regardless of the reduced turbine inlet temperature as the valve opens, a peak in turbine efficiency is observed during characterization of the valve at the middle of the operating range. A detailed experimental analysis shows the unusual behavior during steady state and transient operation, which is considered a key point for future control strategies in terms of turbine efficiency optimization and cathode airflow control.
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Tucker, David, Larry Lawson, Thomas P. Smith, and Comas Haynes. "Evaluation of Cathodic Air Flow Transients in a Hybrid System Using Hardware Simulation." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97107.

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Effective control of cathode airflow in a direct fired solid oxide fuel cell gas turbine (SOFC/GT) hybrid power system is critical to thermal management of a fuel cell stack. Hybrid fuel cell turbine designs often incorporate the use of a valved hot air bypass in parallel with the cathode flow to divert a portion of the compressor effluent around the fuel cell system. The primary objective of this valve in the early development of hybrid power systems was to facilitate system startup. From a system controls perspective, the hot air bypass offers the means to balance and manipulate the level of airflow supplied to the fuel cell stack at a minimal efficiency penalty. Manipulation of this valve has a significant impact on stack performance and reliability, as well as cathodic exhaust airflow conditions. Since the turbine is directly coupled to the fuel cell subsystem through the cathode airflow, non-linear effects are propagated through the system components in response to any hot air bypass valve change. The effect of cathode flow transients on hybrid system performance has been evaluated though the manipulation of a hot air bypass valve on a hardware-based simulation facility designed and built by the U.S. Department of Energy, National Energy Technology Laboratory (NETL). A brief overview of this experimental facility is provided and has been described in more detail previously. Open loop experiments were conducted using the facility, where a perturbation was made to the hot air bypass flow and turbine speed was allowed to change in response. The impact of the transients to both fuel cell and turbine performance are discussed.
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Restrepo, Bernardo, and David Tucker. "Transient Analysis of Simultaneous Multivariable Signals on Fuel Cell/Gas Turbine Hybrid to Define Control Strategies for Cathode Parameters and Compressor Stall." In ASME 2017 15th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2017 Power Conference Joint With ICOPE-17, the ASME 2017 11th International Conference on Energy Sustainability, and the ASME 2017 Nuclear Forum. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fuelcell2017-3555.

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Transients in a hybrid system composed of a solid oxide fuel cell (SOFC) and a gas turbine (GT) were evaluated during simultaneous manipulation of system airflow bypasses and turbine electric load. The three airflow bypass valves selected for study were chosen for their potential application in controlling dynamic excursions of the main fuel cell and gas turbine parameters in the system. The objective of this work was to understand the physical behavior by the simultaneous operation of the bypass valves along with the turbine electric load in order to formulate scenarios of control on the key parameters relevant to system failure, specifically from compressor stall and surge. Empirical data was collected using the National Energy Technology Laboratory Hybrid Performance project hardware simulation of a SOFC/GT hybrid. Step changes were implemented in all three valves for various open/close valve commands and increase/decrease of the turbine electric load simultaneously. The transient response of process variables was analyzed to determine the potential for mitigating or aggravating compressor stall and surge during load excursions.
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