Abstract
Continuous improvement in the operational characteristics of gas turbine equipment and a significant reduction in the time of its creation have led to the development and application of new technologies for conducting research tests of a gas generator—the basic section of a bypass turbojet engine. Carrying out such tests requires the reproduction of the thermo gas dynamic parameters of the working fluid at the gas generator inlet to ensure maximum similarity to the processes occurring in the engine being designed. Obtaining a working fluid with the required thermo gas dynamic parameters such as temperature, pressure, and air flow rate is carried out on the basis of a test complex. The test complex, as a control object, is a non-linear, non-stationary, multi-variable system, where each controlled variable substantially depends on other control actions. The article presents the main aspects of the behavior of the object under consideration, which are the basis for the development of an automated test system and, in particular, the principles of forming control algorithms based on the theory of fuzzy logic. The graphs of the state and control of the main elements of the test complex are presented. Special attention is given to the analysis of the proposed control algorithms.
Highlights
Received: December 2021Accepted: January 2022Published: 2 February 2022 Publisher’sNote: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Licensee MDPI, Basel, Switzerland
The specialized test complex under consideration [15] is based on the process of obtaining a working fluid with the required thermogasdynamic parameters, in which the representation of these parameters is performed on the basis of a modified bypass turbojet engine with separate flows of the gas generator and bypass duct, and with the independent working fluid bleed from the bypass duct of a technological bypass turbojet engine
Increasing/decreasing the operating mode of the process engine increases/decreases the temperature TGG and the pressure PGGat the gas generator inlet; increasing/decreasing the operating mode of the process engine causes a shift inthe operating point up/down on the gas-dynamic characteristic line of the process engine compressor; increase/decreasein the amount of the working fluid bypassing into the atmosphere causes a decrease/increase in the temperature TGG and the pressure PGG at the gas generator inlet; and increase/decreasein the amount of the working fluid bypass causes a shift inthe operating point up/down on the gas-dynamic characteristic line of the process engine compressor
Summary
Received: December 2021Accepted: January 2022Published: 2 February 2022 Publisher’sNote: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Licensee MDPI, Basel, Switzerland. Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Continuous improvement inthe operational characteristics of gas-turbine engines and reducing the time and cost of their creation require the use of the latest techniques aimed at improving the strength and thermal state properties of the engine rotor and stator elements, increasing the compressor stall margin, and improving the emission, amongothers. One of the most important stages for the development of new technologies in an engine-building enterprise is research testing of a gas generator with simulation of the core inlet conditions for a full-size engine [1]. The major disadvantages of such tests are the prevailing manual operations, which requirehigh qualifications and the well-coordinated work of personnel, having a multi-iteration nature, and as a consequence, leading to significant time taken to evaluatethe required thermogasdynamic parameters at the inlet of the test gas generator [1,2]. One the most effective solutions is to increase the level of test automation
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