| Currently gas turbine technology level has become one of the important signs of the level of a national science and technology, military strength as well as country's comprehensive power, this technical level directly affects a country's energy, national defense, and industrial competition ability. Gas turbine has got such rapid development and much attention, because it has high thermal efficiency, less contamination and so on. These advantages and thermal performance have a critical impact on gas effective compression in gas turbine compressor before heating combustion. In theory and practical study, when compressor pressure ratio is bigger and efficiency is higher, the ultimate thermal performance of gas turbine is better. Therefore, we should study the higher pressure ratio and efficiency of a single stage in gas turbine in order to improve the performance of gas turbines, thus rotating ramjet was born with new concept, new technology and new compression system.The rotating ramjet rotor is a new type of compression system based on shock wave compression technology. The air pressurization way of shock wave compression in ramjet flow-path has high compression ratio, higher efficiency and so on. Because this new type of compression system has above advantages, in the Marine power, vehicle engineering, gas turbine, distribution micro gas turbine and other devices it has great development and application prospect. Therefore, it has the important theoretical significance and practical value to conduct a comprehensive and thorough research on rotating ramjet rotor and ramjet flow-path.According to the research status for rotating ramjet at home and abroad, this paper mainly designed and established the rotating ramjet compression rotor as well as its core component-ramjet flow-path. Through ramjet flow-path field simulation of the rotating ramjet compression rotor, calculates flow-path field distribution of rotating ramjet compression rotor in design rotating speed and different export back pressure conditions, and analyzes the influence of ramjet flow-path field distribution in different back pressure and different flow-path structure. On this basis, ramjet flow-path field is expanded to 3D model research, and study similarly 3D flow-path field distribution of ramjet and the influence of field distribution under the condition of different export back pressure, finally we can determine normal back pressure of 3D flow-path.In the normal back pressure condition, this paper study the force analysis of rotating ramjet based on 3D ramjet flow-path, and get the air force and the mathematical model of air force. On this basis, establish the finite element model of rotating ramjet rotor. Finally the paper researches and analyzes the rotor dynamic performance of rotating ramjet under this force, get various order critical rotating speed and its corresponding each order vibration mode under different support conditions, as well as rotor dynamic response only in air exciting-vibration force and under the coupled action of air exciting-vibration force and unbalance force. |
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