摘 要：本文以典型的发动机短舱为研究对象，分析了发动机短舱上的气动阻力，详细介绍了相应的溢流阻力计算方法。通过引入定流量的发动机进气道入流边界和定总温总压的发动机喷流边界条件，避免了对发动机复杂内流的模拟，从而建立了发动机短舱溢流流动的数值模拟方法，并给出了相应的溢流阻力计算方法。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。最后采用该数值方法，模拟了发动机短舱在不同工作流量下的流动现象，计算分析了相应的溢流阻力产生原因。

Abstract: Using the typical engine nacelle as the research object, the aerodynamic intlet drag forces are analyzed, and the corresponding numerical method for computing the spillage drag is introduced thoroughly in this paper. By presenting the numerical boundary conditions for nacelle inlet and exhaust where the mass flow, stagnation temperature and pressure have been given respectively, the requirement of the complex internal flow simulation in the engine is avoided, and then the numerical methods of the nacelle flows simulation around the engine and the spillage drag are proposed. By utilizing the NACA-1-81-100 nacelle inlet as a standard numerical test, the availability of the numerical method presented here has been proved. Finally adopting this numerical methods, the flows around the engine nacelle with different inlet mass flow ratios are simulated, and the spillage drags are computed and the relevant reasons are analyzed.