Numerical Simulation of Two-Stage Variable Geometry Turbine

Kozak, Dariusz; Mazuro, Paweł; Teodorczyk, A.

doi:10.3390/en14175349

Cited by 9 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Variable burner cooling and variable area nozzle (VAN) systems could improve gas turbine performance and reduce pollutant emissions. Dariusz et al [19] studied three different variable geometric positions and three different turbine speeds of a two-stage system. The result proposed a new idea for turbines with variable blade geometry to solve the problem of low turbine efficiency [20].…”

Section: Computational Modelmentioning

confidence: 99%

Angle-Regulating Rule of Guide Vanes of Variable Geometry Turbine Adjusting Mechanism

et al. 2023

View full text Add to dashboard Cite

In recent years, more and more attention has been paid to research on variable geometry turbine engines with the increasing requirement of engine performance. Variable geometry turbine technology can significantly improve the operating performance of aero engines. Adjusting the working angle of the turbine guide vane can change the thermodynamic cycle of the engine operation, so that the turbine can respond to different engine operating conditions. Variable geometry turbines work in harsh environments. Therefore, the design of the variable geometry turbine needs to consider the effect of thermal deformations of the mechanism on operational stability. There are few research studies on variable geometry turbine adjusting mechanisms. This paper established the numerical calculation models of two adjusting mechanisms by integrating fluid mechanics, heat transfer, and dynamic theories, which are paddle and push–pull rod mechanisms. The models were applied to study the effects of components’ thermal deformations and flexible bodies on the motion characteristics of the adjusting mechanism. Furthermore, the performance of the two adjusting mechanisms was compared. The calculation results show that the paddle rod adjusting mechanism can accurately adjust the angles of guide vanes. The paddle rod adjusting mechanism has a larger driving stroke and smaller driving force than the push–pull rod adjusting mechanism. The paddle adjustment mechanism was better suited to the operational requirements of the variable geometry turbine. The research results of this paper are relevant to the design of variable geometry turbine regulation structures.

show abstract

Section: Computational Modelmentioning

confidence: 99%

Angle-Regulating Rule of Guide Vanes of Variable Geometry Turbine Adjusting Mechanism

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The transient operation of turbocharged diesel engines has also been associated with poor driving as well as gaseous emissions [28]. It is well known that the turbocharger contributes to an optimized combustion process for the engine [29]. Also, the transient operation is mostly optimized in the light of response and provides the demanded torque above the maximum torque generated by a natural aspired engine [30].…”

Section: Turbocharging Principlesmentioning

confidence: 99%

Advanced Engine Technologies for Turbochargers Solutions

et al. 2021

View full text Add to dashboard Cite

Research in the process of internal combustion engines shows that their efficiency can be increased through several technical and functional solutions. One of these is turbocharging. For certain engine operating modes, the available energy of the turbine can also be used to drive an electricity generator. The purpose of this paper is to highlight the possibilities and limitations of this solution. For this purpose, several investigations were carried out in the virtual environment with the AMESim program, as well as experimental research on a diesel engine for automobiles and on a stand for testing turbochargers (Turbo Test Pro produced by CIMAT). The article also includes a comparative study between the power and torque of the naturally aspirated internal combustion engine and equipped with a hybrid turbocharger. The results showed that the turbocharger has a very high operating potential and can be coupled with a generator without decreasing the efficiency of the turbocharger or the internal combustion engine. The main result was the generation of electrical power of 115 W at a turbocharger shaft speed of 140,000–160,000 rpm with an electric generator shaft speed of 14,000–16,000 rpm. There are many constructive solutions for electrical turbochargers with the generator positioned between the compressor and the turbine wheel. This paper is presenting a solution of a hybrid turbocharger with the generator positioned and coupled with the compressor wheel on the exterior side.

show abstract

“…There are different technical solutions for adaptive turbine geometries and nozzle geometries considered in the literature: In the automotive sector, variable turbine geometries (VTG) are used for exhaust gas turbochargers. This allows for adaption to the fluctuat-ing thermal power supply through the exhaust gas of the combustion engine [16,17]. By means of pivoting guide vanes, the nozzle throat area is adjusted in order to match the available mass flow rate [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…This allows for adaption to the fluctuat-ing thermal power supply through the exhaust gas of the combustion engine [16,17]. By means of pivoting guide vanes, the nozzle throat area is adjusted in order to match the available mass flow rate [17,18]. At Francis turbines for waterpower production, a similar approach is followed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of an Adaptive Supersonic Micro Turbine for Waste Heat Recovery Applications

et al. 2021

View full text Add to dashboard Cite

Micro turbines (<100 kWel) are commercially used as expansion machines in waste heat recovery (WHR) systems such as organic Rankine cycles (ORCs). These highly loaded turbines are generally designed for a specific parameter set, and their isentropic expansion efficiency significantly deteriorates when the mass flow rate of the WHR system deviates from the design point. However, in numerous industry processes that are potentially interesting for the implementation of a WHR process, the temperature, mass flow rate or both can fluctuate significantly, resulting in fluctuations in the WHR system as well. In such circumstances, the inlet pressure of the ORC turbine, and therefore the reversible cycle efficiency must be significantly reduced during these fluctuations. In this context, the authors developed an adaptive supersonic micro turbine for WHR applications. The variable geometry of the turbine nozzles enables an adjustment of the swallowing capacity in respect of the available mass flow rate in order to keep the upper cycle pressure constant. In this paper, an experimental test series of a WHR ORC test rig equipped with the developed adaptive supersonic micro turbine is analysed. The adaptive turbine is characterized concerning its off-design performance and the results are compared to a reference turbine with fixed geometry. To create a fair data basis for this comparison, a digital twin of the plant based on experimental data was built. In addition to the characterization of the turbine itself, the influence of the improved pressure ratio on the energy conversion chain of the entire ORC is analysed.

show abstract

Numerical Simulation of Two-Stage Variable Geometry Turbine

Cited by 9 publications

References 26 publications

Angle-Regulating Rule of Guide Vanes of Variable Geometry Turbine Adjusting Mechanism

Angle-Regulating Rule of Guide Vanes of Variable Geometry Turbine Adjusting Mechanism

Advanced Engine Technologies for Turbochargers Solutions

Experimental Characterization of an Adaptive Supersonic Micro Turbine for Waste Heat Recovery Applications

Contact Info

Product

Resources

About