Numerical and experimental investigation of different technologies for adjusting the swallowing capacity of a cantilever ORC turbine

Streit, Philipp; Popp, Tobias; Winkler, Julia; Scharf, Rüdiger; Weiβ, Andreas P.

doi:10.1063/5.0041483

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…The resulting step in the flow path leads to a significant rise of dissipated work. This pronounced behaviour was unexpected by the authors, as in a previous publication [27] both the simulation and the experimental results for a supersonic air turbine indicated only a slight efficiency decrease at 50% nozzle height.…”

Section: Turbine Efficiency For the Different Turbine Configurationsmentioning

confidence: 47%

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

et al. 2021

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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.

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Section: Turbine Efficiency For the Different Turbine Configurationsmentioning

confidence: 47%

“…As already described in a previous publication [27], different technologies for adjusting the swallowing capacity of a supersonic turbine were considered by the authors. The adjustable nozzle height (ANH) concept, which is similar to the concept of Rogo et al [25,26], was the most promising technology.…”

Section: Anh Concept and Its Implementationmentioning

confidence: 99%

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

et al. 2021

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“…To carry out these analysis and turbine optimizations, appropriate CFD software has to be chosen. For that reason, the software Fine/Turbo by NUMECA [22] which the authors already used for previous investigations [23,24], was used for the simulations. For the rotor stator interface, a full non-matching frozen rotor was used.…”

Section: Cfd Physical Models and Boundary Conditionsmentioning

confidence: 99%

Parameterized, numerical design of a two-wheel Curtis steam turbine for small scale WHR

Streit

Weiß

2021

MATEC Web Conf.

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In contrast to the current trend of converting waste heat into electricity in the small power range below 100 kWel by means of an ORC plant, the authors are pursuing the concept of a micro steam power plant equipped with a micro turbine. Water avoids many of the problems often associated with organic working fluids, such as flammability, toxicity, greenhouse gas effect and high fluid costs. However, water vapor makes turbine design more challenging. The physical reasons for this are repeated, and thereby it becomes clear why a velocity compounded two wheel Curtis turbine has been chosen. The used in-house 1D turbine design tool is briefly introduced. More focus is put on the shortcomings of the implemented 1D loss model and their negative impact on the current turbine design. Consequently, the authors continued actual turbine design by a parameterized approach in 3D CAD/CFD. This approach is explained, and finally, the CFD flow field and the performance maps of the designed turbine are discussed. The turbine is currently under construction and will be installed in 2022 in a waste heat recovery (WHR) plant in Nuremberg/Germany.

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Numerical and experimental investigation of different technologies for adjusting the swallowing capacity of a cantilever ORC turbine

Cited by 2 publications

References 12 publications

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

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

Parameterized, numerical design of a two-wheel Curtis steam turbine for small scale WHR

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