Design and Investigations of a Micro-Turbine Flow Part

Abstract

The co-generative micro-power plant with the HFE7100 as a working medium was designed and built for experimental investigations. The heat output of the plant was assumed equal to 20 kW, while the electric output amounted to about 3kW. In the paper a multi-stage micro-turbine with partial admission of all the stages is described in detail and the results of the particular experimental investigations and numerical calculations are shown, followed by an appropriate discussion and conclusions. The flow calculations were performed using ANSYS package and finally the axial multistage turbine was chosen. This allowed to apply typical nozzle and blade profiles. The turbine consists of 5 similar (almost identical) stages with constant section blades, the only difference being the increase of the admission arc (number of nozzles) in the successive stages. The rotor speed was assumed equal to 8000 rpm, mean rotor diameter −100 mm and blade height −10 mm. The stream lines, pressure and temperature distribution in the nominal and off-design conditions are presented and discussed in the paper. The micro-turbine was built and tested experimentally. The turbine performance was calculated for HFE7100 but also for air and nitrogen as a working medium for testing purposes. In the first stage of experiments the turbine behaviour was checked using these gases and the results were compared with the calculation data. The results of the experiments correspond very well with the appropriate CFD calculation data.

Investigation of Gas Foil Bearings With an Adaptive and Non-Linear Structure

“…This also applies to devices used in distributed power generation, which additionally should be small in size and have a low impact on the surrounding environment (i.e., low noise and emissions). As far as cogeneration systems and trigeneration systems (in which heat energy is generated simultaneously with electricity and cold) are concerned, such requirements can easily be met by using high-speed fluid-flow machines such as microturbines (Kiciński, 2015, Kosowski et al, 2018, Włodarski, 2018. In order to enable microturbine rotors to operate at increasingly higher rotational speeds, novel bearing systems must be developed.…”

Influence of Different Biofuels on the Efficiency of Gas Turbine Cycles for Prosumer and Distributed Energy Power Plants

“…Previous research has shown that it is possible to build a set of microturbines with a capacity of about 2 kW with higher efficiency than in existing machines [74]. It is worth noting that the relatively high efficiency of microturbines can be achieved due to a very careful and advanced design process.…”

Advanced Turbine Cycles with Organic Media

“…At present, due to coal-fired plants, the power systems in many countries, are characterized by a relatively low efficiency [1,2]. In the case of distributed energy systems, however, the efficiency of electricity production is even lower [3][4][5], and the Organic Rankine Cycle power plants achieve the efficiency which exceeds 10% [6][7][8] (seldom about 20%). Higher values of efficiency are obtained by ultra-supercritical steam turbine power plants [9,10], combined gas-steam thermal cycles [11] or modified ORC cycles [12].…”

“…The values of initial pressure and temperature have been determined taking into account particular schema of the cycle, media stability limitation and the maximum value of the cycle efficiency. The pressure in the condenser has been estimated assuming the temperature of the cooling water equal to 15 • C. The efficiencies of particular elements (typical of micro power plants) are shown in Table 1 [3,4,6,7,27]. • 1,1,1,3,3-pentafluorobutane (chemical formula-C4H5F5, commercial name-R365mfc, [24]); • Methylcyclohexane (chemical formula-C7H14, commercial name-c1cc6, [24]); • N-propylcyclohexane (chemical formula-C9H18, commercial name-c3cc6, [24]); • Undecane (chemical formula-C11H24, commercial name-C11, [24]); • 1-chloro-3,3,3-trifluoroprop-1-ene (chemical formula-C3H2ClF3, commercial name-R1233zd, [25]).…”

“…The pressure in the condenser has been estimated assuming the temperature of the cooling water equal to 15 °C. The efficiencies of particular elements (typical of micro power plants) are shown in Table 1 [3,4,6,7,27].…”