【摘要】 通过对喷气式飞机尾焰流场特点的深入分析,绘制了尾焰的等温线图和各组分等压图。考虑了谱线的碰撞展宽效应和多普勒展宽效应,利用单谱带模型C-G近似法,计算了尾焰各控制体的吸收系效,同时给出了尾焰红外辐射强度的计算方法和步骤。最后,计算了某单管型号的喷气式飞机在非加力状态下的3μm～5μm红外辐射强度,并与实际的测量数据进行了比较,分析表明该结果与实际测量数据具有较好的一致性。更多还原

【Abstract】 The characteristics of flow field of jet aircraft were analyzed thoroughly.The Isothermal and the components’ equal pressure intensity line of plume were calculated.According to the collided-broaden effects and the Doppler-broaden effects of the spectrum,the absorption coefficients of gas of the plume’s different parts were calculated by using the C-G approximate model of simple channel bands.At the same time,calculational method and steps of infrared radiation released from plume were provided.At last,the 3～5μm infrared radiation intensity released from a simple spout jet aircraft at normal state was calculate and the calculation result was compared with the test data.The result of comparison indicates that the difference between calculation and test data is small.更多还原