Addition of momentum and kinetic energy effects in supersonic compressible flow using pseudo bond graph approach

Sanei, Ahmad; Novinzadeh, Alireza Basohbat; Habibi, Majid

doi:10.1080/13873954.2014.885055

Cited by 7 publications

(8 citation statements)

References 6 publications

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“…The bond graph, when used as a modeling framework, provides the ability for the designer to examine causal difficulties. Furthermore, this type of modeling has the benefit of a constant and consistent structure related to the system which can minimize the issue of numerical stiffness [28][29][30][31][32][33][34][35][36]. According to Vangheluwe et al's [37] evaluation, the bond graph is the most suitable graph for library-based modeling with respect to its high potential for the best modularity, re-usability, and adaptability among other modeling formalisms and languages.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Control of the Starter Motor and Start-Up Phase for Gas Turbines

2019

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Improving the performance of industrial gas turbines has always been at the focus of attention of researchers and manufacturers. Nowadays, the operating environment of gas turbines has been transformed significantly respect to the very fast growth of renewable electricity generation where gas turbines should provide a safe, reliable, fast, and flexible transient operation to support their renewable partners. So, having a reliable tools to predict the transient behavior of the gas turbine is becoming more and more important. Regarding the response time and flexibility, improving the turbine performance during the start-up phase is an important issue that should be taken into account by the turbine manufacturers. To analyze the turbine performance during the start-up phase and to implement novel ideas so as to improve its performance, modeling, and simulation of an industrial gas turbine during cold start-up phase is investigated this article using an integrated modular approach. During this phase, a complex mechatronic system comprised of an asynchronous AC motor (electric starter), static frequency converter drive, and gas turbine exists. The start-up phase happens in this manner: first, the clutch transfers the torque generated by the electric starter to the gas turbine so that the turbine reaches a specific speed (cranking stage). Next, the turbine spends some time at this speed (purging stage), after which the turbine speed decreases, sparking stage begins, and the turbine enters the warm start-up phase. It is, however, possible that the start-up process fails at an intermediate stage. Such unsuccessful start-ups can be caused by turbine vibrations, the increase in the gradients of exhaust gases, or issues with fuel spray nozzles. If, for any reason, the turbine cannot reach the self-sustained speed and the speed falls below a certain threshold, the clutch engages once again with the turbine shaft and the start-up process is repeated. Consequently, when modeling the start-up phase, we face discontinuities in performance and a system with variable structure owing to the existence of clutch. Modeling the start-up phase, which happens to exist in many different fields including electric and mechanical application, brings about problems in numerical solutions (such as algebraic loop). Accordingly, this study attempts to benefit from the bond graph approach (as a powerful physical modeling approach) to model such a mechatronic system. The results confirm the effectiveness of the proposed approach in detailed performance prediction of the gas turbine in start-up phase.

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Section: Introductionmentioning

confidence: 99%

Modeling and Control of the Starter Motor and Start-Up Phase for Gas Turbines

2019

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“…Bond graph modeling of turbo-machinery have been reported for a simple cycle single-shaft gas turbine, 10–12 high-speed turbo-machines, 13 an ideal turbocharger, 14 convergent-divergent nozzles with supersonic fluid flows, 15 radial compressor system, 16 cold start phase of a microjet engine, 17 turbocharged diesel engines, 18 and an industrial gas turbine. 19 As two recent examples of applications of this approach, Montazeri-Gh et al.…”

Section: Introductionmentioning

confidence: 99%

“…Neither any gas turbine cycle nor any gas turbine engine were modeled in other studies. [13][14][15][16]18 In fact, the bond graph approach has been applied in modeling the diffusor and nozzle, 13 compressor and turbine, 14 convergent-divergent nozzle, 15 radial compressor, 16 and diesel engine. 18 Among the recently published studies, 17,[19][20][21] which are also carried out by the same group of authors as this study, only three industrial gas turbine modeling were achieved with the aid of bond graph approach (using the energy fields) and the results of simulations were also validated.…”

Section: Introductionmentioning

confidence: 99%

Bond graph modeling of a jet engine with electric starter

Montazeri-Gh

Fashandi

2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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Following the technological advances in recent decades, advanced electronic systems linked to the gas turbine industry are increasingly considered by the designers of this field. For this purpose, new airborne systems in conjunction with jet engines are developed, which are incorporated in many challenging design problems such as control law and configuration design. Thus, a comprehensive modeling structure is needed that can bolster the integrity of the system development such as the bond graph approach, which is known as an efficient method for modeling complicated mechatronic systems. In this paper, modeling and simulation of a jet engine dynamic performance and aircraft motion are achieved based on the bond graph approach. At first, the electric starter bond graph model is constructed and physical relationships governing each engine component are obtained. In the aftermath, the modulated energy fields are developed for the jet engine components. Subsequently, the bond graph model of the engine is numerically simulated and experimentally tested and verified for a small jet engine. Finally, bond graph modeling and simulation of integrated engine and aircraft system is presented. The test results indicate the acceptable accuracy of the modeling approach which can be applied for innovative diagnosis and control systems design.

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“…The following literature review on gas turbine modeling by the bond-graph method is presented. Bond-graph modeling of turbo-machinery has been reported for a simple-cycle single-shaft gas turbine, 6–8 high-speed turbo-machines, 9 an ideal turbocharger, 10 convergent–divergent nozzles with supersonic fluid flows, 11 radial compressor system, 12 cold start phase of a microjet engine, 13 turbocharged diesel engines, 14 and an industrial gas turbine. 15…”

Section: Introductionmentioning

confidence: 99%

Modeling and simulation of a two-shaft gas turbine propulsion system containing a frictional plate–type clutch

Montazeri-Gh

Fashandi

2018

Proceedings of the Institution of Mechanical Engineers, Part M:

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A marine propulsion system is composed of several subsystems that operate in a variety of energy fields. The propulsion power of a ship can be provided from a two-shaft gas turbine. In this article, the modeling of a two-shaft gas turbine and its associated subsystems including gears, flexible couplings and clutch is considered. These components are connected in the form of a virtual marine propulsion system, which is based on the bond-graph approach. When a clutch is used in a propulsion system, discontinuities occur in the describing model, which leads to some challenging problems when performing computer simulations. The two main difficulties are the numerical stiffness and the variable model structure. In this research, the bond-graph method is adapted as the modeling framework in order to allow a constant system structure model that minimizes the stiffness problem. Next, simulation results of a two-shaft gas turbine are presented in the off-design condition and verified with experimental tests. These results demonstrate the acceptable accuracy of computer simulations. Also, the effects of clutch performance on the dynamics of the marine propulsion system are discussed.

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Addition of momentum and kinetic energy effects in supersonic compressible flow using pseudo bond graph approach

Cited by 7 publications

References 6 publications

Modeling and Control of the Starter Motor and Start-Up Phase for Gas Turbines

Modeling and Control of the Starter Motor and Start-Up Phase for Gas Turbines

Bond graph modeling of a jet engine with electric starter

Modeling and simulation of a two-shaft gas turbine propulsion system containing a frictional plate–type clutch

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