Investigation On Design And Temperature Distortion Characteristics Of Small Flow Temperature Distortion Generator

Temperature distortion generator, which is required to accurately simulate the working range of all kinds of temperature distortion source, is one of the important equiments evaluating the engine aerodynamic stability. To study the operating characteristics of temperature distortion generator has great significance for the design and stability evaluation of aeroengine. In this paper, the research on the design and operating-characteristic of temperature distortion generator for small flow aeroengine has been conducted by experiment and numerical simulation based on the engineering application.The main constributions include:(1)Aiming at the temperature distortion generator using hydrogen as fuel, the stabilizer and hydrogen injection rod were designed by taking the inlet parameters of small flow aeroengine as the design parameters. Two schemes including along and against the current air were proposed and numerically simulated. The results indicated that two schemes could work stably.(2)The steady combustion characteristics of one component model of temperature distortion generator and 90 ° circumferetial extent hydrogen-burning TDG were studied by the method of experiment. The results showed that: The face-average temperature rise of model outlet was 19 K and circumferetial temperature distribution was less than 15%. With the increase of hydrogen pressure the temperature rise increased gradually. The total-pressure recovery coefficient of the models was greater than 0.98, the total pressure non-uniformity of air interface plane was less than 2%, the temperature non-uniformity was less than 15%, the face-average temperature rise of outlet which was greater than20 K rised with the increase of the equivalence.(3)The steady combustion characteristics of one component model of temperature distortion generator were studied by the method of numerical simulation. And the combustion reaction model of numerical simulation comprised the one step reaction and multi-step elementary reaction. The calculation result of elementary reaction was more approximate to experimental result. Therefore numerical simulation would select the elementary as the combustion reaction model.The computational models of hydrogen-burning temperature distortion generator with different circumferetial range and single-stage compressor were built to study the steady and unsteady combustion process of TDG. It was found that the section of which the temperature rise and circumferetial temperature distribution of temperature distoretion field began to change stably was600 mm from the stabilizer. Through the compressor blade, the distortion magnitude andcircumferetial temperature distribution decreased, and circumferetial extent of high temperature zone shifted along the direction of rotation of the blade. Meanwhile the greater distortion magnitude could induce the appearance of vortex at the compressor outlet, which caused the unsteady flow in the compressor. The two nonadjacent sectors which was separate by just one sector obtained the larger circumferetial extent of high temperature zone than the two adjacent sectors. The higher the hydrogen pressure, the bigger the temperature rise rate, while the larger the variable volume, the lower the temperature rise rate.(4)The preliminary design and numerical simulation of air jet distortion generator was conducted.The air jet distortion generator could obtain the temperature rise of 300 K when the inlet temperature of hot flow was 1500 K,and circumferetial temperature distribution was less than 15%.