Підвищення ефективності дозвукового вхідного пристрою силової установки з турбогвинтовентиляторним двигуном

Abstract

В роботі створено науково-методичний апарат для вирішення задачі підвищення ефективності вхідних пристроїв турбогвинтовентиляторних двигунів шляхом вибору раціональних значень геометричних параметрів та форми вхідного пристрою. Розроблені науково – обґрунтовані рекомендації щодо кількості вхідних стійок кільцевого вхідного пристрою для турбогвинтовентиляторного двигуна. Розроблено науково – обґрунтовані рекомендації щодо відносної довжини хорди силової стійки вхідного пристрою на аеродинамічні характеристики вхідного пристрою турбогвинтовентиляторного двигуна. Удосконалено методику проектування ковшового вхідного пристрою силової установки з турбогвинтовентиляторним двигуном. Проведено оцінку впливу співвісного гвинтовентилятора на ефективність ковшового вхідного пристрою силової установки з турбогвинтовентиляторним двигуном. Встановлено, що застосування ковшового вхідного пристрою, замість кільцевого вхідного пристрою, дозволяє підвищити коефіцієнт відновлення повного тиску на 5 – 7 %. The selection and justification of the turbulent viscosity model was carried out by solving the test problem of modeling the flow in a propeller fan and in the annular inlet device of a turbofan engine. In the work, a scientific and methodological apparatus was created to solve the problem of increasing the efficiency of input devices of turbofan engines by choosing rational values of geometric parameters and the shape of the input device. Based on the results of the analysis of scientific and technical literary sources, it was found that reducing total pressure losses in the inlet device before the compressor is one of the urgent tasks, because the increase in losses in the inlet device leads to an increase in specific fuel consumption. Input racks and the shape of the input device are among the important factors affecting the efficiency of the input device. However, research on the selection of rational values of the geometric parameters of the input racks and the shape of the input device, taking into account the propeller fan, is currently insufficient. Therefore, the tasks of researching the influence of the geometric parameters of the input racks and the shape of the input device on the efficiency of the input device, taking into account the influence of the propeller fan, are relevant. An analysis of models and methods of solving the problems of flow research in coaxial propeller fans and input devices was carried out. The selection and justification of the turbulent viscosity model was carried out by solving the test problem of modeling the flow in the propeller fan and in the annular inlet device of the turbofan engine. Based on the results of the test task, the SST Transitional #4 Gamma Theta Model turbulent viscosity model was chosen for further research. When conducting the test task, the results of the numerical experiment were compared with the results of the flight tests; the calculation error was less than 1%. Scientifically based recommendations on the number of inlet racks of the annular inlet device for a turboprop engine have been developed. Scientifically based recommendations have been developed regarding the relative length of the power strut chord of the input device on the aerodynamic characteristics of the input device of the turboprop engine. The improved technique allows you to build a bucket inlet device of a power plant with a turboprop fan engine, ensuring the equivalence of air flow, compared to an annular inlet device. Scientifically based recommendations on the rational value of the curvature and narrowing of the S-shaped channel to ensure the increase in efficiency of the bucket inlet device have been obtained. The geometric feature of the resulting bucket inlet device ensures the minimization of total pressure loss while maintaining the required air flow at the engine inlet. The influence of the coaxial propeller on the efficiency of the bucket inlet device of the power plant with the turboprop engine was evaluated. It was established that the use of a bucket inlet device, instead of a ring inlet device, allows increasing the full pressure recovery factor by 5-7%.