- New experimental data has been accumulated concerning changes of the hydraulic resistance coefficients and the mean heat emission of tubes with internal spiral finning produced by deform cutting during induced flow of heat carriers in the range of dimensionless regime and geometric parameters extending the range in the existing scientific research. An extended database of the hydraulic resistance coefficients and the mean thermal radiation by tubes with internal spiral finning manufactured by means of various technologies and methods: the use of wire thread inserts, thread cutting, extrusion, roll forging, spiral knurling of the external surfaces of tubes. For the first time, experimental data from the period from 1986 to 2020 has been taken into account. We have compiled universal recommendations for the determination of the values of hydraulic resistance coefficients and the mean thermal radiation of tubes with internal spiral finning by using generalised laws derived on the basis of an analysis of the formed database for tubes with internal spiral finning in a wide range of dimensionless regime and geometric parameters. For the first time, on the basis of the methods of minimisation of entropy generation and an analysis of obtained generalising laws, by using a genetic optimisation algorithm, our researchers have determined the ranges of the values of the geometric dimensions of tubes with internal spiral finning that ensure the besrtthermohydraulic characteristics. An algorithm and an original software programme has been developed for the forecasting of the thermohydraulic characteristics of tubes with internal spiral finning on the basis of the use of artificial neural networks. Our researchers have tested a laboratory sample of a heat exchange apparatus with replaceable bundles of tubes with internal spiral finning produced by deform cutting. The observed results of the optimisation of dimensionless geometrical parameters of internal spiral finning have been confirmed.
- A complex mathematical model has been developed that describes the dynamics of a gas-droplet mixture in a two-dimensional setup accounting for a number of physical processes, such as splitting, coagulation, evaporation of droplets and condensation of the vapour phase; the problem has been solved in a new setup and in the description of new effects on the basis of a mathematical model of the dynamics of a polydisperse multivelocity multitemperature gas-vapour mixture accounting for the processes of splitting, coagulation, evaporation of droplets and vapour condensation. A method and a device for liquid regasification have been developed.
- We have proposed and patented configurations with rational dimensions of heat exchange surfaces with oval-trench and oval-arc dimples that are efficient surface vortex generators - heat and mass transfer intensifiers. Our researchers have conducted a numerical modelling of the intensification of laminar and turbulent heat transfer in narrow channels, including in the space between the radiation-exposed fins of the air condenser. A thin channel with a bundle of inclined single-row oval-trench dimples has been reviewed. The impact of the depth, the step, the elongation, the angle of inclination of flow onto dimples on the thermohydraulic characteristics.
- Relying on an analysis of experimental data, we have determined the levels of heat transfer intensification in the turbulent flow regime in multi-row and single-row systems of oval-trench and oval-arc dimples. It has been shown that the level of hydraulic resistance in channels with oval-arc dimples is 10-13 per cent less than in channels with oval-trench dimples. This ensures a higher thermohydraulic efficiency of channels with oval-arc dimples by 23 and 14 per cent in case of single-row and multi-row placement correspondingly. For a more technologically interesting range of geometric parameters and the turbulent regime, we have produced criteria equations for the hydraulic resistance and heat transfer coefficients in channels with single-row oval-trench dimples. The produced equations allow to forecast the thermal and hydraulic characteristics with a deviation of up to 20 per cent. The mean squared error across the whole database is between 5 and 8 per cent for the values of the increment of the hydraulic resistance of heat transfer both for the testing and the training data set. Thus, our researchers demonstrated the possibility of the use of a model of a neural network in computer software to compute heat transfer equipment and ensure enhanced precision of forecasting of their parameters.
- The Laboratory has conducted an experimental and numerical analysis of a passive method of influence on the near-wall region of the heat-transmitting surface by finning with the use of a resource-efficient (zero waste) method of deform cutting. According to the results of the conducted engineering and numerical research and a partial comparison with experimental research data, a conclusion has been made that the use of numerical research methods allows to reliably and precisely forecast the thermohydraulic characteristics of fin and tube oil radiators without conducting costly and tedious full-scale tests of created samples of equipment. On the basis of methods of numerical modelling of convective heat transfer, a computation methodology has been developed and tested that is applicable to a wide range of heat transfer devices. A distinctive aspect of the methodology is the representation of the ribbed part of the heat-transmitting surface as porous inserts. The developed methodology allows to reduce the requirements for equipment for numerical modelling and reduce computation duration. The results of numerical modelling correspond well with the results of the experiment.
- On the basis of the conducted analysis of the results of experimental research, we have developed recommendations for the implementation of belts of fan-shaped holes for film cooling of the airfoil portions of muzzle blades of a gas turbine engine for the specified regions of the turbine blade profile. We have determine the regions of change of the regime parameters, where the use of traditional cylindrical holes is required.
Implemented results of research:
- A collaborative project with the Engineering Center «Energoprogress» (Kazan) has been conducted on the territory of a branch of JSC «Tatenergo» – Naberezhniye Chelny Heat and Power Plant to increase the efficiency of the regeneration system of the turbo generator No. 7 for the later development, manufacturing, and implementation of an enhanced low-pressure heater.
- On the basis of the results of the completion of a commercial agreement with Research Centre «NIIturbokompressor named after Vladimir B. Shnepp» (Kazan) with the use of numerical methods of modelling of convective heat transfer, the Laboratory has developed and tested a methodology for the development of air cooling devices. A feature of the methodology is the representation of the finned part of the heat-transferring surface in the form of porous inserts.
- Within a agreement with «KAMAZ», a numerical modelling and an experimental verification of the results of computations aerodynamics and heat transfer in the engine room of a lorry truck. The methodology features the representation of of the heat-transferring surface in the form of porous inserts.
Education and career development:
The Laboratory for Modelling Physical and Technical Processes of the Kazan National Research Technical University is the officially designated place of conduct of , educational, industrial, research, pre-graduate internships of bachelor's degree students of the Department of Thermal and Power Engineering majoring in «Heat and power engineering» and master's degree students majoring in «Heat and power engineering» with the specialisations «Chemical and power engineering technology» and «Theoretical foundations of thermal engineering»:
- Thermal engineering systems and power devices. Degree: Bachelor of Science. Form of study: intramural. Major: «Heat and power engineering» Specialisation: «Power engineering in thermal technologies»
- Thermal engineering systems and power devices. Degree: Master of Science. Form of study: intramural. Major: «Heat and power engineering» Specialisation: «Theoretical foundations of thermal engineering»
In 2019 – 2020, 3 dissertations for the degree of Candidate of Science were prepared and defended on the grounds for the Laboratory:
In 2020, 2 students have been admitted to the graduate school.
Organizational and structural changes:
The Laboratory is functioning as an independent infrastructure of the research sector of the Kazan National Research Technical University, it effectively cooperates with other research and educational foundations within initiatives and grants from the Russian Foundation for Basic Research and the Russian Science Foundation, as well as research and manufacturing enterprises within commercial and cooperation agreements.
In 2018 – 2020, the Laboratory provided services and equipment for the research of combustion to the Department of Technical Physics of the Kazan National Research Technical University, the Research Centre for Composite Materials of the the Kazan National Research Technical University, to Kazan Helicopters JSC for the research of high-speed imaging of fuel tank jettison etc.
Collaborations:
- A. V. Lykov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus, Belarusian State Technological University (Belarus): joint scientific research, a grant from the Russian Foundation for Basic Research.
- Research Centre «Energoprotsess» (Russia): joint research, engagement of employees of the Laboratory in the implementation of an agreement.
- Saint Petersburg State University of Civil Aviation, Saint Petersburg State Marine Technical University (Russia): research collaboration with the leading scientist.
- Research Institute of Mechanics of Moscow State University (Russia): joint research under the supervision of the leading scientist.
- S. S. Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences (Russia): joint research under the supervision of the leading scientist.
- «NIIturbokompressor named after Vladimir B. Shnepp» (Russia): joint research.
- «KAMAZ» (Russia): performance of contracts.
- A. Lyulka Design Bureau (branch of UEC Ufa Engine Industrial Association): performance of contracts.
- Kazan Scientific Center of the Russian Academy of Sciences (Russia): joint research under the supervision of the leading scientist.
