【摘要】：超聲速燃燒沖壓發(fā)動機技術是當今世界的重點研究方向,它的技術水平直接體現了一個國家的科技水平,已成為衡量一個國家科技水平的重要標準。習慣上簡稱為超燃沖壓發(fā)動機。當飛行器馬赫數大于6時,必須使用超燃沖壓發(fā)動機作為推進動力,它的發(fā)展受到了很多發(fā)達國家的關注。在21世紀超燃沖壓發(fā)動機技術必定會以更快的方式發(fā)展,并廣泛應用于民生、軍事等多個領域,影響人類的未來。超燃沖壓發(fā)動機是在一個多物理場耦合的環(huán)境下工作的,工作過程中不僅有氣動熱引起的溫度場與流場的耦合,還有因結構傳熱引起的結構場與溫度場的耦合。超燃沖壓發(fā)動機的壁面內部溫度最高可以達到1400K—1600K,材料的選擇也必須能夠承受高溫和高壓,且具有較高的強度。當然,在保證正常工作的前提下,還要盡可能的降低超燃沖壓發(fā)動機的質量,合理的安排材料分布,提高性能,節(jié)省材料。本文首先利用有限元軟件patran對某型超燃沖壓發(fā)動機建立了有限元模型,給定初始熱通量和初始溫度,在假定發(fā)動機正常運行10s的前提下根據傳熱學理論進行了熱固耦合的瞬態(tài)溫度場分析和結構分析。然后利用優(yōu)化軟件isight集成patran/nastran和mtalab,使用matlab編程來關聯(lián)單元節(jié)點與壁厚,并使用isight軟件中的優(yōu)化方法來對超燃沖壓發(fā)動機的壁厚進行優(yōu)化,在滿足材料極限應力和變形要求的條件下,減輕發(fā)動機重量,省去不必要的材料。
[Abstract]:Supersonic combustion ramjet technology is the key research direction in the world today. Its technical level directly reflects a country's scientific and technological level and has become an important standard to measure a country's scientific and technological level. In the 21st century, scramjet technology will surely develop in a faster way and will be widely used in many fields, such as people's livelihood, military affairs and so on, affecting the future of mankind. Only the coupling of temperature field and flow field caused by aerodynamic heat transfer and the coupling of structure field and temperature field caused by structure heat transfer can be achieved. The maximum temperature inside the wall of scramjet can reach 1400 K-1600 K. The material selection must be able to withstand high temperature and pressure and have high strength. In this paper, a finite element model of a scramjet is established by using the finite element software patran. Given the initial heat flux and temperature, the model is based on the assumption that the engine is running normally for 10 seconds. The theory of heat transfer is used to analyze the transient temperature field and the structure of the scramjet. The optimization software iSIGHT is used to integrate patran/nastran and mtalab. The matlab program is used to correlate the node and wall thickness of the scramjet. The optimization method of iSIGHT software is used to optimize the wall thickness of the scramjet to meet the material limit stress. Under the condition of force and deformation requirements, the engine weight is reduced and unnecessary materials are omitted.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：V231

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本文編號：2233301