本文選題：適航審定　切入點：飛機(jī)燃油箱　出處：《南京航空航天大學(xué)》2016年碩士論文

【摘要】：燃油箱燃燒將嚴(yán)重影響民用飛機(jī)的安全性,導(dǎo)致機(jī)毀人亡的災(zāi)難性事故,因此必須在飛機(jī)研制與適航審定過程中,對飛機(jī)燃油箱可燃性進(jìn)行評估。論文針對運輸類飛機(jī)適航標(biāo)準(zhǔn)第981條“燃油箱點燃防護(hù)”的符合性驗證要求,對民用飛機(jī)燃油箱可燃性評估方法進(jìn)行了研究。給出了用于燃油箱可燃性評估的燃燒極限判據(jù)與氧濃度極限判據(jù),分別針對未采用可燃性降低措施(Flammability Reduced Method,FRM)與采用FRM的民用飛機(jī)燃油箱,提出了基于蒙特卡羅仿真可燃性評估基本思想。對未采用FRM的燃油箱可燃性評估方法進(jìn)行了研究,利用燃燒極限判據(jù)提出了基于蒙特卡羅仿真的燃油箱可燃性評估程序。該程序仿真特定條件下飛機(jī)的數(shù)次飛行,獲取每一次飛行中飛機(jī)燃油箱內(nèi)的溫度變化情況,然后將每一次飛行過程劃分為若干時間單位,將每一時間單位的燃油溫度與可燃性上下限進(jìn)行比較,以判定該時間單位的燃油箱可燃性,多次仿真即可求得飛機(jī)燃油箱的可燃性。對采用FRM的燃油箱可燃性評估方法進(jìn)行了研究,利用氧濃度極限判據(jù)提出了基于數(shù)值仿真的氧濃度評估流程,并結(jié)合燃燒極限判據(jù)提出了可燃性評估程序。該程序數(shù)值仿真求得各時間單位的氧氣濃度;將每一時間單位的氧氣濃度與氧濃度極限進(jìn)行對比,并綜合考慮燃燒極限判據(jù)以確定該時間單位燃油箱可燃性,多次仿真即可求得飛機(jī)燃油箱的可燃性。
[Abstract]:The combustion of fuel tank will seriously affect the safety of civil aircraft and lead to the catastrophic accident of aircraft destruction and death. Therefore, the flammability of fuel tank of aircraft must be evaluated in the process of aircraft development and airworthiness verification.In this paper, the evaluation method of fuel tank flammability for civil aircraft is studied in accordance with the requirement of conformance verification of fuel tank ignition protection in article 981 of airworthiness standard for transport aircraft.The combustion limit criterion and oxygen concentration limit criterion used for fuel tank flammability evaluation are presented. The flame ability Reduced method is used for the fuel tank without flammability reduction and the civil aircraft fuel tank with FRM is used.The basic idea of flammability evaluation based on Monte Carlo simulation is presented.The flammability evaluation method of fuel tank without FRM is studied, and a fuel tank flammability evaluation program based on Monte Carlo simulation is proposed by using combustion limit criterion.The program simulates several flights of the aircraft under certain conditions, obtains the temperature changes in the fuel tank of the aircraft in each flight, and then divides each flight process into several units of time.The fuel temperature of each unit of time is compared with the upper and lower limits of flammability to determine the flammability of the fuel tank in the unit of time, and the flammability of the fuel tank can be obtained by multiple simulations.The evaluation method of fuel tank flammability using FRM is studied. The oxygen concentration evaluation process based on numerical simulation is proposed by using the oxygen concentration limit criterion, and the flammability evaluation program is put forward in combination with the combustion limit criterion.The program calculates the oxygen concentration of each unit of time numerically, compares the oxygen concentration of each time unit with the limit of oxygen concentration, and synthetically considers the combustion limit criterion to determine the flammability of the fuel tank per unit of time.The flammability of aircraft fuel tank can be obtained by multiple simulations.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：V228.11

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