Aerospace Technic and Technology

A cyclic air intercooling application in the compression process in the compressor has a positive effect on the resource of the gas turbine plant (GTP) and on increasing its capacity without reducing the service life. The most promising method of cooling the cyclic air of the GTP, namely contact cooling by using an aerothermopressor, was analyzed in the paper. This heat exchanger is a two-phase jet apparatus in which, due to the removal of heat from the airflow, the air pressure is increased and its cooling occurs. The main problem in the development of the aerothermopressor is to determine the geometric characteristics of the apparatus flow part and the fluid injection system, which allow its effective application for increasing pressure and fluid spraying fine. An analysis was made of the apparatus models operation by using CFD simulation in the ANSYS Fluent software package to determine the aerothermopressor main characteristics of the cyclic air cooling system of the GTP. The calculation method was determined, the turbulence model was selected, the calculation was carried out taking into account the convergence of the results, and the output data were processed and visualized in the CFD-Post in the form of graphs and fields. Based on this, the aerothermopressor design was developed for a WR-21 gas turbine produced by Rolls Royce. At the first stage of the study, a “dry” aerothermopressor was modeled (without water injection into the evaporation chamber). It was found that the decrease in airflow pressure due to friction losses was about 5%. At the second stage of the study, a simulation of the aerothermopressor with water injection into the flow part (at the inlet to the evaporation chamber) was carried out. As a result of thermogasdynamic compression, the increase in the total air pressure at the outlet of the aerothermopressor was 3.1%, and the temperature of the cooled air was decreased by 280 degrees. To ensure effective air compression in the gas turbine compressor, incomplete evaporation of water in the aerothermopressor was considered. It made it possible to obtain finer water spraying at the diffuser outlet, while the average diameter of the water droplet decreased to 2.5 μm.

compressor; aerothermopressor; cyclic air; CFD simulation

Romanovskyy, G. F., Vashhylenko, M. V., Serbin, S. I. Teoretychni osnovy proektuvannia sudnovyh gazoturbinnyh agregativ [Theoretical bases of designing ship gas turbine plants]. Mykolayiv, UDMTU, 2003. 304 p.

Konovalov, D. V., Kobalava H. O. Проміжне охолодження циклового повітря в газотурбінних установках аеротермопресорами [Intercooling of Gas Turbine Plant Cyclic Air with an Aerothermopressor]. Aerospace Technic and Technology, 2018, no. 1 (145), pp. 29–36.

Stepanov, I. R., Chudinov, V. I. Nekotorye zadachi dvizheniya gaza i zhidkosti v kanalakh i truboprovodakh energoustanovok [Some problems of the gas and liquid motion in the channels and pipelines of power plants]. Leningrad, The Science Publ., Leningrad department, 1977. 199 p.

Alekseev, A. V. Povyshenie effektivnosti gazoturbinnykh ustanovok putyom kontaktnogo okhlazhdeniya ukhodyashhikh gazov v aerotermopressore [Increasing of the Gas Turbines Efficiency by Contact Cooling of Flue Gases in the Aerothermopressor]. Energetika i elektrotekhnicheskaya promyshlennost`, 1961, no. 2, pp. 32–38.

Konovalov, D. V., Kobalava H. O. Zastosuvannia kontaktnoho okholodzhennia povitria aerotermopresorom v tsykli hazoturbinnoi ustanovky [Contact Air Cooling by Using the Aerothermopressor in the Gas Turbine Plant Cycle]. Refrigeration Engineering and Technology, 2018, no. 54 (5), pp. 62−67.

Jonsson, М., Yan, J. Humidified gas turbines – a review of proposed and implemented cycles. Energy, 2005, no. 30, pp. 1013–1078.

Fowle A. A. An experimental investigation of an aerothermopressor having a gas flow capacity of 25 pounds per second. Cambridge: Massachusetts Institute of Technology, 1972. 157 p.

ANSYS Fluent Tutorial Guide Release 17.0. Canonsburg, ANSYS, Inc., 2016. 1216 p.

Nijdam, J. J., Baoyu, D., Fletcher, D. F., Langrish, T.A.G. Lagrangian and Eulerian Models for Simulating Turbulent Dispersion and Coalescence of Droplets within a Spray. Applied Mathematical Modeling, 2006, no. 30, pp. 1196–1211.

Montazeri, H., Blocken B., Hensen, J.L.M. Evaporative Cooling by Water Spray Systems: CFD simulation, Experimental Validation and Sensitivity Analysis. Building and Environment, 2015, no. 83, pp. 129–141.

Korkodinov, Y. A. Obzor semejstva k-ε modelej dlya modelirovaniya turbulentnosti [An Overview of the k-ε Family of Models for Modeling Turbulence]. Vestnik PNIPU. Mashinostroenie, materialovedenie, 2013, no. 15(2), pp. 5–16.