本文選題：飛機(jī)結(jié)冰 + 數(shù)值模擬�。� 參考：《南京航空航天大學(xué)》2016年碩士論文

【摘要】：飛機(jī)在飛行過(guò)程中遇到特定氣象條件時(shí),會(huì)發(fā)生結(jié)冰并改變?cè)瓉?lái)的外形,從而對(duì)其氣動(dòng)特性、操縱性以及穩(wěn)定性等造成破壞,給飛行安全帶來(lái)隱患。實(shí)際的結(jié)冰是一個(gè)多學(xué)科綜合的復(fù)雜物理過(guò)程,對(duì)該過(guò)程進(jìn)行數(shù)值模擬時(shí)需要建立相對(duì)應(yīng)良好的模型才能獲得較為準(zhǔn)確的結(jié)果�，F(xiàn)階段國(guó)內(nèi)外大部分學(xué)者采用的都是基于Messinger思想的數(shù)值模型,這類(lèi)模型普遍有著簡(jiǎn)單、準(zhǔn)確、易于計(jì)算等優(yōu)勢(shì),但是由于模型的連續(xù)性,使其在結(jié)冰的微觀(guān)現(xiàn)象捕捉方面有所不足。因此本文在考慮單個(gè)水滴離散運(yùn)動(dòng)的情況下,采用了一種基于Szilder思想的新模型來(lái)進(jìn)行結(jié)冰預(yù)測(cè)數(shù)值模擬。文中的主要工作有:(1)采用高效的CFD軟件Fluent對(duì)機(jī)翼繞流流場(chǎng)進(jìn)行模擬,并將計(jì)算所得的機(jī)翼表面壓力系數(shù)與相關(guān)試驗(yàn)數(shù)據(jù)進(jìn)行了對(duì)比,說(shuō)明了該方法的可行性。(2)為了考察數(shù)值模擬冰形在研究結(jié)冰對(duì)機(jī)翼氣動(dòng)特性影響中的有效性,對(duì)一組試驗(yàn)冰形和基于Messinger模型的數(shù)值模擬冰形在ICEM中進(jìn)行了結(jié)構(gòu)化網(wǎng)格劃分,并在Fluent中分別進(jìn)行了兩種冰形在不同攻角情況下的升阻力系數(shù)計(jì)算,通過(guò)對(duì)結(jié)果的分析說(shuō)明了數(shù)值模擬冰形在計(jì)算結(jié)冰后的機(jī)翼氣動(dòng)特性時(shí)存在一定的誤差。(3)利用歐拉法建立了水滴運(yùn)動(dòng)特性的控制方程,進(jìn)行了幾組不同直徑下的水滴撞擊特性的計(jì)算,得到了結(jié)冰機(jī)翼表面的水滴收集系數(shù),為結(jié)冰預(yù)測(cè)提供了初始條件。(4)基于一種新的思想建立了隨機(jī)結(jié)冰模型,其中包括水滴的隨機(jī)發(fā)射模型、隨機(jī)運(yùn)動(dòng)模型以及結(jié)冰概率模型。編寫(xiě)了模擬結(jié)冰的程序,并對(duì)不同條件下的結(jié)冰進(jìn)行了數(shù)值預(yù)測(cè),最后將模擬冰形與試驗(yàn)值以及基于Messinger模型的CIRAMIL的計(jì)算結(jié)果進(jìn)行了對(duì)比,并對(duì)隨機(jī)結(jié)冰模型的優(yōu)劣提出了評(píng)價(jià)。
[Abstract]:In the course of flight, the aircraft will freeze and change its original shape, which will destroy its aerodynamic characteristics, maneuverability and stability, and bring hidden trouble to flight safety. The actual icing is a complex physical process which is synthesized by many subjects. In order to obtain more accurate results, a good corresponding model is needed for numerical simulation of the process. At present, most scholars at home and abroad adopt numerical models based on Messinger thought. These models generally have the advantages of simple, accurate and easy to calculate, but because of the continuity of the model, It is insufficient in catching the microscopic phenomenon of ice formation. In this paper, a new model based on Szilder is used to simulate the ice formation in the case of discrete motion of single water droplet. The main work in this paper is: (1) the flow field around the wing is simulated by using the efficient CFD software Fluent, and the calculated surface pressure coefficient of the wing is compared with the experimental data. The feasibility of this method is illustrated. In order to investigate the effectiveness of numerical simulation ice shape in studying the effect of icing on the aerodynamic characteristics of wing, a group of experimental ice shapes and numerical simulation ice shapes based on Messinger model are divided into structured meshes in ICEM. The lifting resistance coefficient of two ice shapes at different angles of attack is calculated in Fluent. The analysis of the results shows that there is a certain error in the calculation of the aerodynamic characteristics of the frozen wing in the numerical simulation of the ice shape. The Euler method is used to establish the governing equation of the motion characteristics of the water droplets. In this paper, several groups of water droplets with different diameters are calculated, and the water droplet collection coefficients on the surface of the frozen wing are obtained. The initial conditions for ice prediction are provided. (4) based on a new idea, a stochastic icing model is established. These models include the random emission model of water droplets, the random motion model and the icing probability model. The program of simulating icing is compiled, and the ice formation under different conditions is predicted numerically. At last, the simulated ice shape is compared with the experimental data and the calculated results of CIRAMIL based on Messinger model, and the merits and demerits of stochastic icing model are evaluated.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：V321.229

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳宇;羅艷春;劉國(guó)慶;朱麗;;飛機(jī)結(jié)冰對(duì)飛行安全的影響[J];裝備制造技術(shù);2014年05期

2 申曉斌;林貴平;卜雪琴;郁嘉;侯盼雪;;發(fā)動(dòng)機(jī)進(jìn)氣道短艙前緣結(jié)冰三維模擬研究[J];航空學(xué)報(bào);2013年03期

3 周莉;徐浩軍;楊哲;;基于隨機(jī)運(yùn)動(dòng)模型的結(jié)冰密度預(yù)測(cè)方法[J];北京理工大學(xué)學(xué)報(bào);2013年01期

4 王超;常士楠;楊波;黎明中;;機(jī)翼防冰過(guò)程中冰脊問(wèn)題的數(shù)值分析[J];北京航空航天大學(xué)學(xué)報(bào);2013年06期

5 易賢;桂業(yè)偉;朱國(guó)林;;飛機(jī)三維結(jié)冰模型及其數(shù)值求解方法[J];航空學(xué)報(bào);2010年11期

6 李紅琳;;嚴(yán)格飛機(jī)除冰/防冰液適航審定[J];中國(guó)民用航空;2006年02期

7 陳維建,張大林;瘤狀冰結(jié)冰過(guò)程的數(shù)值模擬[J];航空動(dòng)力學(xué)報(bào);2005年03期

8 張大林,陳維建;飛機(jī)機(jī)翼表面霜狀冰結(jié)冰過(guò)程的數(shù)值模擬[J];航空動(dòng)力學(xué)報(bào);2004年01期

9 楊倩,常士楠,袁修干;水滴撞擊特性的數(shù)值計(jì)算方法研究[J];航空學(xué)報(bào);2002年02期

10 上官云信,賀德馨,杜新明;結(jié)冰模擬對(duì)運(yùn)七飛機(jī)橫向特性及舵面效率的影響[J];氣動(dòng)實(shí)驗(yàn)與測(cè)量控制;1993年04期

，

本文編號(hào)：1901259