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为分析发动机溢流阻力的产生原因并为进气道-发动机匹配研究提供一定的技术支持,以典型的发动机短舱为研究对象,分析了短舱上的进气道阻力,并详细介绍了相应溢流阻力的数值计算方法。在对发动机短舱外流模拟时,通过引入两个和发动机参数相关的数值边界条件,即一个是定流量的发动机进气道入流边界,另一个是定总温总压的发动机喷流边界,避免了对发动机复杂内流的模拟。利用NACA-1-81-100发动机进气道作为标准算例,验证了数值方法的可行性。通过模拟发动机短舱在不同工作流量下的流动,认为发动机短舱的溢流阻力产生归因为溢流造成的发动机外表面的阻力变化,以及捕获流管变细导致的附加阻力增加。
In order to analyze the cause of engine flooding resistance and provide some technical support for intake-engine matching research, a typical nacelle was taken as the research object, and the resistance of the air intake on the nacelle was analyzed. Numerical Calculation of Overflow Resistance. In the simulation of the engine nacelle outflow, by introducing two numerical boundary conditions related to the engine parameters, namely, one is the inlet flow boundary of the engine with constant flow rate and the other is the boundary of the engine jet set with the total temperature and total pressure to avoid The simulation of the engine complex influx. Using NACA-1-81-100 engine intake as a standard example, the feasibility of numerical method is verified. By simulating the flow of engine nacelles at different working flows, it is considered that the creep resistance of engine nacelle is attributed to the change of resistance on the outer surface of the engine caused by overflow and the increase of additional resistance due to the thinning of the trapped flow tube.