Mathematical modeling of the reverse feeding system of a turbofan with ultra-high bypass ratio

Dmytro Plakushchyu, Mykhailo Mitrakhovych

Abstract


This study investigates a ducted propfan in reverse mode, considering the influence of air bypass from outside the duct or air leakage after the propfan impeller. The size of the bypass windows and the dependence of the air flow rate through the bypass windows of a ducted propfan in reverse mode when changing the flight speed and the dependence of the reverse thrust of a ducted propfan in reverse mode, considering the influence of air intake from outside the duct or air leakage after the propfan impeller, are the subjects of the study. The study object is a ducted propfan with rotating blades of the impeller of a bypass ratio turbojet engine with an ultra-high bypass ratio (m = 20). The bypass windows are located behind the propfan impeller. The purpose of this study is to study the reverse thrust of a ducted propfan in reverse mode, considering the influence of air intake from outside the duct or air leakage after the propfan impeller. The flow simulation in a ducted propfan with rotating blades of the impeller of an ultra-high bypass ratio turbojet engine with an ultra-high bypass ratio was conducted under standard atmospheric conditions in the reverse mode in the range of the M number from 0.1 to 0.25 for the variants of the absence of bypass windows and with an increase in the relative area of the bypass windows from 0 to 0.63. The dependences of the change in the air flow rate through the bypass windows of the ducted propfan when changing the speed and the reverse thrust characteristics of the ducted propfan in the reverse mode were obtained. The flow visualization in several modes is presented, which confirms the efficiency of air bypass behind the propfan impeller. The scientific novelty and practical significance of the research results lie in the fact that new data were obtained on determining the rational size of the bypass windows and the dependence of the change in air flow rate through the bypass windows of a ducted propfan in reverse mode on the change in speed and thrust characteristics of the reverse of the ducted propfan in reverse mode, considering the influence of air intake from outside the hood or air leakage after the propeller fan impeller.

Keywords


propfan; reverse; ducted propfan; bypass windows; mathematical modeling; propeller fan thrust; Mach number

References


MacIsaac, B., & Langton, R. Gas Turbine Propulsion Systems. West Sussex, United Kingdom: John Wiley & Sons, 2011. 328 p.

Hünecke, K. Jet Engines – Fundamentals of Theory, Design and Operation. 6th impression 2003 – Stuttgart: Motor books International, 1997. 242 p.

Daggett, D. L., Brown, S. T., & Kawai, R. T. Ultra-Efficient Engine Diameter Study. Boeing Commercial Airplane Group. NASA/CR—2003-212309. Seattle, Washington, Glenn Research Center. 2003. 63 p.

Rohra, A., & Tracksdorf, P. Thrust Reverser for a Propfan Engine. Patent, № P403981.2, 1992.

Kravitz, E. Analysis and Experiments for Contra-Rotating Propeller. Massachusetts Institute of Technology, 2011. 142 p.

Denysyuk, O. V. Otsinka kharakterystyk za-kapotovanoho hvyntoventylyatora TRDD z nadvy-sokym stupenem dvokonturnosti [Performance assessment of the ducted propfan of the turbofan engine with ultra-high bypass ratio]. Aviacijno-kosmicna tehnika i tehnologia – Aerospace technic and technology, 2021, no. 4sup1 (173), рр. 41-46. doi: 10.32620/aktt.2021.4sup1.06. (in Ukrainian).

Veron, D. F., Page, G. S., & Welge, H. R. Propfan Experimental Data Analysis : NASA-CR-1665e2. Ames Research Center. - Moffett Field, California, 1984. 118 p.

Stuermer, A. Unsteady CFD simulations of contra-rotating propeller propulsion systems. AIAA-2008-5218, 2008. 16 p. doi: 10.2514/6.2008-5218.

Suryanarayana, Ch., Rao, M. N., & Raju, P. N. Structural Analysis of a Contra Rotating Propeller by using Finite Element Method (FEM). International Journal of Innovative Research and Development, 2015, No. 4(7), рр. 80-92.

Plakushchyy, D. O., & Kravchenko, I. F. Otsinka kharakterystyk zakapotovanoho povorotnoho hvyntoventylyatora v pol'ovykh umovakh [Evaluation of the characteristics of a ducted rotary propfan in flight conditions]. Aviacijno-kosmicna tehnika i tehnologia – Aerospace technic and technology, 2024, no. 4sup1 (197), pp. 38-44. DOI: 10.32620/aktt.2024.4sup1.03. (in Ukrainian).

Plakushchyy, D. O., & Torba, Yu. I. Analiz mozhlyvosti vykorystannya povorotnoho hvyntoventylyatoru dlya reversuvannya tyahy [Analysis of the possibility of using a rotary propeller fan for thrust reversal]. KhI Vsesvitniy konhres «Aviatsiya u XXI stolitti» – «Bezpeka v aviatsiyi ta kosmichni tekhno-lohiyi» [XI World Congress "Aviation in the 21st Century" - "Aviation Safety and Space Technologies"]. Kyyiv, Nats. Aviatsiynyy universytet - National Aviation University, 2024, pp. 1.4.15-1.4.18. (in Ukrainian).

Tereshchenko, Y., Kulyk, N., Panyn, V., Mytrakhovych, M., Volyanskaya, L., Hrekov, P., Kynashchuk, Y., & Kyrchu, F. Intehratsiya aviatsiynykh sylovykh ustanovok i lital'nykh aparativ [Integration of aviation power plants and aircraft]. NAU, Kyyiv, NAU-druk, 2009. 341 р. (in Ukrainian).




DOI: https://doi.org/10.32620/aktt.2025.4sup1.08