Inlet injection nozzle model and turbofan engine model
A technology of ejector nozzle and intake port, which is applied in the directions of machine/engine, jet propulsion device, geometric CAD, etc., can solve the problem of inability to judge whether the ejector nozzle has ejection function, and the model of the intake port ejector nozzle. Combined modeling with engine model, unfavorable engine performance analysis, etc., to achieve the effect of easy transplantation, improved confidence, and improved speed
Active Publication Date: 2021-05-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
However, in the previous studies, the model simulation and flow field analysis of the port injection nozzle were obtained through complex two-dimensional theoretical calculations. Therefore, it is difficult to jointly model the port injection nozzle model and the engine model. It is also impossible to judge whether the ejection nozzle has an ejection function in fighter jet missions, which is not conducive to the analysis of engine performance. It needs to be simplified on the basis of two-dimensional flow and integrated into the engine model
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[0030] Aiming at the deficiencies of the existing technology, the solution idea of the present invention is to establish an inlet injection nozzle model with greatly reduced computational complexity based on the quasi-one-dimensional flow theory, the computational complexity of the model is reduced, and it is easy to transplant and integrate into the overall engine In the calculation software, it is easy to combine with the turbofan engine model to form a turbofan engine model with inlet injection nozzle.
[0031] The one-dimensional theory of the ejector nozzle is to solve the secondary flow rate under the known parameters of the main and secondary flow total pressure, total temperature and mainstream flow rate, and through reasonable assumptions in accordance with the law of conservation of mass, momentum and energy in the control body. An important feature of ejector flow is the secondary flow choke phenomenon. Under sufficient mainstream pressure, the flow area of the ...
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The invention discloses a nozzle injection nozzle model of an air intake port. Based on the quasi-one-dimensional flow theory, the present invention establishes an inlet injection nozzle model with greatly reduced computational complexity. The computational complexity of the model is reduced, and it is easy to transplant and integrate into the overall calculation software of the engine, and is easy to integrate with turbofans. The engine model is combined to form a turbofan engine model with a port injection nozzle. The invention also discloses a model of a turbofan engine comprising the model of the intake port injection nozzle. Compared with the two-dimensional theoretical calculation method, the inlet injection nozzle model based on the quasi-one-dimensional flow theory established by the present invention is effectively improved in speed, easy to be transplanted and integrated in the overall calculation software of the engine, and can be compared with the turbofan engine model Combined, a turbofan engine model with an inlet ejector nozzle is formed, which is used to analyze the ejection effect of the ejector nozzle in different task segments, and further improve the confidence of the model.
Description
technical field [0001] The invention belongs to the field of system modeling and simulation in aerospace propulsion theory and engineering, and in particular relates to an inlet ejector nozzle model. Background technique [0002] Stealth technology is also called low detectable technology or target signature control technology. It is a comprehensive technology that makes it difficult for the enemy's detection system to detect or shorten the distance by changing the detectable characteristic signals of weapons and equipment and other targets. Low detectability has become one of the most important characteristics that current and future advanced fighters must have. The turbofan engine is the main power of combat aircraft, and its intake / exhaust system is an important source of radar scattering and infrared radiation. Engine stealth, that is, reducing the infrared and radar signatures of the intake / exhaust system, is an important prerequisite for fighter jets to achieve steal...
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IPC IPC(8): F02K1/28F02K1/82G06F30/17
CPCF02K1/28F02K1/825G06F30/17
Inventor 陈浩颖张海波宋劼胡忠志郑前钢李秋红
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS