飞机平台诱发环境温度的建模与仿真

摘要

The internal environment induced by airplane platform is an actual work environment of the air-borne equipment,and the induced environment temperature is a main influence factor on airborne equip-ment work.Aimed at the problems of modeling and simulation of internal environment temperature in-duced by airplane platform,the main influence factors are analyzed,and the modeling method of induced temperature is proposed based on similar heat transfer structures classification.The aircraft's similar heat transfer structures are classified as a wing cabin structure,a ring cabin structure,a big cabin structure,an open cabin structure,and a thermal protection structure.The general lumped parameter models of the 5 heat transfer structures are established.Taking Modelica language as a tool,the simulation models of the 5 heat transfer structures are also established.The similar temperature regional division is made taking a cer-tain type aircraft as example,and the 5 heat transfer structure simulation models are used.The internal environmental temperature simulation model of whole airplane platform is established.The simulation re-sult verifies the feasibility of the modeling and simulation method.The simulation results show that the air temperature in the fuselage cabin can be up to 70℃,the temperature in the engine nacelle can be up to 140℃ in short time,and between 90℃~110℃ in long time,the temperature in the engine thermal protec-tion structure can be up to 160℃.%飞机平台的诱发环境是机载设备的实际工作环境,诱发环境温度是影响机载设备工作的主要环境因素。针对飞机平台诱发环境温度的建模与仿真问题,分析了影响飞机平台诱发环境温度的主要因素,提出了以相似传热结构分类为基础的一种飞机平台诱发环境温度建模与仿真方法。将飞机平台相似传热结构分为翼形舱结构、环形舱结构、大舱室结构、开启舱结构和热防护结构,采用集中参数方法建立5种传热结构的通用热特性模型,以Modelica语言为工具建立了5种传热结构的通用热特性仿真模型。对飞机平台进行相似热区域划分,采用通用热特性仿真模型建立飞机整机的诱发环境温度仿真模型。以某型机为例,进行了诱发环境温度仿真计算,验证了建模与仿真的可行性。仿真表明,飞机飞行时机身区域舱内空气温度最高可达70℃,发动机舱内温度短时间内可达140℃,长时间工作在90℃~110℃之间,发动机热防护结构的最高温度可达160℃。