The article is devoted to the investigation and development of microsteam turbine unit of the LPI design for utilization of heat of exhaust gases of internal combustion engines. This installation will reduce the world carbon dioxide emissions, as well as add useful power for the needs of the consumer. Efficiency and environmental friendliness of the engine will increase. The article discusses development of the main directions of improvement of high-loaded steps of LPI, expansion of modern outlooks on the directions of MRI development and the use of LPI steps in the systems of heat recovery of exhaust gases of the internal combustion engine. The possibility to utilize the heat of exhaust gases of internal combustion engines by means of a turbine unit and the subsequent receipt of additional useful capacities are investigated in many developed countries of the world. Germany, Sweden, Japan, PRC and other leading countries in the automotive industry are intensively conducting works in this direction. The results of such studies have already found application in some freight cars. In the Russian market, this type of turbine is spread very weakly. Turbine unit behind the internal combustion engine works in conditions of low volumetric consumption of the working fluid, which leads to a decrease in the heights of the flow parts of the guides and working grids, because of which the relative gaps in the seals increase. This leads to the growth of leakage of the working fluid. On the other hand, a high degree of pressure reduction when choosing single-stage turbines leads to supersonic
BACKGROUND: Gas turbine units (GTU) are widely used in power plants, shipbuilding, aerospace and other industry sectors. Main performance indicators of units are effective cycle efficiency and useful internal power. It is known that gas turbine power grows on 1525% for each 100C of turbine inlet temperature increases in range of 10001400 K, which makes it possible to save fuel significantly. Further growth of turbine inlet temperature demands more drastic increase of cooling air flow rate for the sake of cooling of the GTU flow channel, that leads to decrease of effective efficiency of a GTU. Consequently, the research of cooling and heat capacity properties influence needs to be done in order to improve gas turbine unit performance in the turbine inlet temperature range of 10001400 K. AIMS: Issues of influence of cooling of high temperature GTUs as well as issues of influence of working substance specific heat capacity dependence on temperature are studied in the article. METHODS: The study contains comparative analysis of four gas turbine units (GTU) such as: the 3,13 MW Teeda GTU (Iran), the 4,13 MW UEC Perm Engines GTU-4P (Russia), the 5,1 MW Siemens SGT-100 (Germany) and the 5,67 MW Solar Turbines TAURUS 60 (USA). RESULTS: As a result, dependencies of efficiency, specific effective work and GTU useful work coefficient on cooling were obtained. Working substance specific heat capacity dependence on temperature was considered in order to increase accuracy of calculations. CONCLUSIONS: The completed calculation study allows judging on perfection of the heat layout of GTU, the flow channel of GTU and making a comparison of them for the sake of further optimization of operational processes.
BACKGROUND: Modern micro gas turbine units (MGTUs) with the power of dozen of kilowatts are single-shaft and recuperative. Being in the position where improvement of new MGTU cycles is being studied, it is necessary to choose optimal parameters of the MGTU cycle according to the scheme with regeneration when developing such simple units with the aim of ensuring small size and efficiency. Nevertheless, there are several practical restrictions for the development of recuperators, related to the issue of complicated designs together with pressure losses increase caused by regeneration degree increase and to the restriction of materials quality. AIMS: Study of influence of a recuperator on efficiency of the MGTU, as it is essential for the development of MGTUs. METHODS: As a part of the study, the overall assessment of the influence of recuperators on parameters of an ordinary Brayton cycle with recuperation is presented in the article. The influence of main parameters, including degree of pressure increase in a compressor, inlet gas temperature and regeneration degree, on MGTU efficiency is considered in depth in the article. RESULTS: According to the study results, it is revealed that the use of the regeneration degree of over 0,9 with low coefficient of pressure losses in recuperators for the development of modern recuperative MGTUs leads to the unit effective efficiency not exceeding 3840% because of certain restrictions of gas temperature at the MGTU turbine inlet caused by difficulties with cooling and ensuring small size and efficiency of the unit. CONCLUSIONS: Use of new heatproof materials is to become an important part of improvement of MGTU in future, therefore it is necessary to study new technical solution when using prospective materials of recuperators for choosing optimal parameters of the MGTU cycle with regeneration. In addition, the option of using bimetallic recuperators is considered.
Physical and mechanical tests of samples made from ABS plastic and polyamide obtained by 3D printing were carried out. Based on the results of experimental studies, the possibility of using additive technologies in the manufacture of low-power turbo generator impellers has been shown.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.