The impact of changes in the geometry of a radial microturbine stage on the efficiency of the micro CHP plant based on ORC

Kaczmarczyk, Tomasz Z.; Żywica, Grzegorz; Ihnatowicz, Eugeniusz

doi:10.1016/j.energy.2017.05.166

Cited by 39 publications

(11 citation statements)

References 38 publications

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“…Mueller et al also created coupled CFD and FEA algorithms [18]. What Kaczmarczyk et al and Passar have demonstrated for radial-flow turbines, is that the change in their flow system has a great influence on the efficiency of the systems tested [19,20]. Zywica et al made calculations of a similar-sized radial turbine but only kinetostatic stresses were determined and the disc was not optimised [21].…”

Section: Introductionmentioning

confidence: 99%

Optimisation of stress distribution in a highly loaded radial-axial gas microturbine using FEM

Zych

Żywica

2020

Open Engineering

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AbstractThe article discusses the stress optimisation process of the highly loaded disc of a high-speed radial-axial microturbine. At the design stage, the strength optimisation is vitally important for these types of devices because they must withstand very high temperatures (600∘C in this case) and be capable of operating at high rotational speeds (96,000 rpm in this case). Calculations were made using a three dimensional FE numerical model. The optimisation process is strictly connected with the choice of materials — which in this case are Inconel 738 (nickel-cobalt super alloy) and silicon nitride. Several stress reduction methods were developed, which took into account the mass of the disc, the rotational speed of the rotor and the complex shape of the rear part of the disc. Numerical computations helped to choose the best optimisation method, which decreased maximum reduced von Mises stresses by about 45% (from 1,288 MPa to 705 MPa). The methods proposed in this article are universal and can be implemented in the design process of various high-speed radial-axial microturbines. This article could be of interest to scientists and engineers who deal with highly loaded microturbines, which are increasingly used in many industrial sectors.

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Section: Introductionmentioning

confidence: 99%

Optimisation of stress distribution in a highly loaded radial-axial gas microturbine using FEM

Zych

Żywica

2020

Open Engineering

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“…The expansion device enables the conversion of the low-boiling working medium's vapour to the rotary motion of the shaft [1]. Scroll expanders [2] and ORC microturbines [3,4] are among the most commonly used commercial expansion devices. ORC microturbines have blade systems that are designed for specific operating parameters such as the type of working medium and the rotational speed.…”

Section: Introductionmentioning

confidence: 99%

Selection of the oil-free bearing system for a 30 kW ORC microturbine

Breńkacz¹,

Żywica²,

Bogulicz³

2019

J. vibroeng.

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The article discusses results of the analyses of various bearing systems for the rotor of an ORC (Organic Rankine Cycle) microturbine with an electric power of 30 kW. It is impossible to choose the appropriate bearing system taking into account only basic parameters of the bearings. When designing a new power turbine, it is important to conduct the dynamic and strength analysis of the entire rotor-bearings-supporting structure system. The nominal rotational speed of the newly designed single-stage axial-flow turbine is 40,000 rpm. The turbine will be powered using the vapour of a low-boiling working medium. The chosen working medium cannot be used in combination with all materials that are commonly used for turbine constructions. An additional requirement was that the turbogenerator must be oil-free. The temperature of the working medium directed to the rotor blades could exceed a value of 200 °C. Three bearing systems were considered: bearings lubricated with a low-boiling fluid (in the liquid form), gas bearings lubricated with the vapour of a low-boiling medium and rolling bearings. Since the rotors used in those three systems have different geometries, their dynamic properties vary as well. The rotor dynamics analyses were carried out using computer programs belonging to the MESWIR environment, which had been developed at the Institute of Fluid-Flow Machinery of the Polish Academy of Sciences (IMP PAN) in Gdańsk. The computational model, based on the finite element method, was used to prepare graphs on which are presented vibration amplitudes as functions of the rotational speed. The computational model, based on the finite element method, served to perform calculations on the basis of which graphs presenting vibration amplitudes as functions of the rotational speed were prepared. Moreover, vibration trajectories of individual nodes of the computational model were shown. Besides analyses of the bearings themselves, calculations were also carried out to assess the dynamic properties of the rotors supported by those bearings in a wide range of rotational speeds. As a result of the conducted analyses, the concept of an innovative turbogenerator was created. Its rotor can operate at a very high rotational speed, and the bearings do not require oil lubrication.

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“…Also it is proposed to improve the environmental situation in agrocomplexes. In this situation, the Rankine organic cycle is used to increase efficiency [1][2][3][4]. Technologies that increase boiler and thermal power plants efficiency are known.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly Organic Rankine Cycle Technology Based on Improved Absorption Refrigerating Machine

Осинцев¹,

Дудкин²,

Prikhodko³

et al. 2019

Proceedings of the VIII Science and Technology Conference “Contemporary Issues of Geology, Geophysics and Geo-Ecology of the No

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The purpose of the work is the development of environmentally friendly technology of heat recovery from condensation of water vapor at a constant partial pressure of the outgoing flue gases in contact heat exchangers with a passive nozzle at thermal power plants running on natural gas, and the use of solar heaters in the block structure of an absorption refrigerating machine. Using contact heat exchangers can reduce greenhouse gas emissions. Greenhouse gas is harmful to the environment. Using solar heaters can improve the efficiency of the Li-Br absorption refrigerating machine. Ways to improve the efficiency of industrial enterprises are different. One of the main ways is to use renewable energy for heat recovery. In addition, the use of renewable energy sources reduces emissions of harmful greenhouse gases into the atmosphere.

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The impact of changes in the geometry of a radial microturbine stage on the efficiency of the micro CHP plant based on ORC

Cited by 39 publications

References 38 publications

Optimisation of stress distribution in a highly loaded radial-axial gas microturbine using FEM

Optimisation of stress distribution in a highly loaded radial-axial gas microturbine using FEM

Selection of the oil-free bearing system for a 30 kW ORC microturbine

Environmentally Friendly Organic Rankine Cycle Technology Based on Improved Absorption Refrigerating Machine

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