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Research on nonlinear model predictive control for turboshaft engines based on double engines torques matching

Chinese Journal of Aeronautics 2020年第2期33卷 561-571页

作者： Yong WANG Qian’gang ZHENG Ziyan DU Haibo ZHANG College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In order to reach a compromise between fast response control and torques matching control in double turboshaft engines,research on nonlinear model predictive control for turboshaft engines based on double engines torques matching is ***,a Nonlinear Model Predictive Control(NMPC)method is proposed,which combines the control index of the power turbine speed with torques matching of double engines *** addition to the control index,the difference of output torques between each engine is also incorporated in the objective function as a penalty term to ensure constant speed control and short torques matching *** results demonstrate that relative to unilateral torques matching,the settling time of the bidirectional matching method can be reduced by nearly 30.8%.Nevertheless,compared with the bidirectional torques matching method under the cascade PID controller,the NMPC method can decrease the overshoot of the power turbine speed by 65%and reduce the matching time by 15.5%*** fast response control of turboshaft engines,fast torques matching control of double engines is accomplished as well.

关键词： Double turboshaft engines Fast response control Helicopter Nonlinear model predictive control Torques matching method

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Performance assessment of simple and modified cycle turboshaft gas turbines

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Propulsion and Power Research 2013年第2期2卷 96-106页

作者： Barinyima Nkoi Pericles Pilidis Theoklis Nikolaidis Deparment of Power and Propulsion School of EngineeringCranfied UniversityCranieldBedfordshire MK430ALUnited Kingdom

This paper focuses on investigations encompassing comparative assessment of gasturbine cycle *** specifically,investigation was caried out of technical performanceof turboshaft engine cycles based on existing simple cycle(SC)and its projected modifiedcycles for civil helicopter ***,thermal efficiency,specific fuel consump-tion,and power output are of paramount importance to the overall performance of gas *** course of carrying out this research,turbomatch software established at CranfieldUniversity based on gas turbine theory was applied to conduct simulation of a simple cycle(baseline)two-spool helicopter turboshaft engine model with free power ***,some modified gas urbine cycle configurations incoporating unconventional components,such as engine cycle with low pressure compressor(LPC)zero-staged,recuperated enginecycle,and intercooled/recuperated(ICR)engine cycle,were also *** doing so,designpoint(DP)and off-design point(OD)performances of the engine models were *** changes in performance parameters of the modified cycle engines over the simplecycle were evaluated and it was found that to a large extent,the modified engine cycles withunconventional components exhibit better performances in terms of thermal efficiency andspecific fuel consumption than the traditional simple cycle *** research made use ofpublic domain open source references.

关键词： Gas turbines turboshaft Technical performance Intercooled Recuperated Low pressure compressor(LPC)zero-staged Simple cycle Comparative assessment

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Design point analysis of two-shaft gas turbine engines topped by four-port wave rotors for power generation systems

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Propulsion and Power Research 2019年第3期8卷 183-193页

作者： A.Fatsis General Department National and Kapodestrian University of AthensEvripus ComplexPsachna34400Greece

Wave rotors are rotating equipment designed to exchange energy between high and low enthalpy fluids by means of unsteady pressure *** ground power plants,they can be used as topping devices to existing gas turbines aiming to improve their performance characteristics.A four-port wave rotor is an attractive configuration to be integrated into the gas generator of a two-shaft gas turbine,typical for power generation and propulsion systems,by slightly modifying the architecture of existing *** particular,in the present article the wave rotor-topped engine utilizes the same compressor,combustion chamber and turbine inlet temperature of the baseline *** analysis for two-shaft gas turbine engines topped with four-port wave rotors is studied and their performance at design point is compared to the performance of the baseline engines *** is concluded that important benefits are obtained with respect to the ones of the baseline engines in terms of specific work and specific fuel *** calculations by varying the pressure ratio within the wave rotor and the pressure losses in the ducts connecting the wave rotor to the engine’s components indicate the effect on performance,for engines with different compressor pressure ratios and turbine inlet temperatures.

关键词： Pressure exchanger Wave rotor Gas turbine turboshaft Ground power unit

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