震波與移動壁面交互作用之數值研究

Numerical Studies on Shock Waves Interacted with a Pair of Moving Wall

賴景昌(Ching-Chang Lai)

指導教授 ： 戴昌賢

國立屏東科技大學/工學院/車輛工程系所/碩士(2013年)

https://doi.org/10.6346/NPUST.2013.00172

摘要

摘要
學號：M10038027
論文題目：震波與移動壁面交互作用之數值研究
總頁數：90
學校名稱：國立屏東科技大學 系(所)別：車輛工程系(所)
畢業年月: 2013年7月 學位別：碩士學位
研究生：賴景昌 指導教授：戴 昌 賢 博士
徐 子 圭 博士
論文摘要內容：
再生能源雖然以其永續性及清潔性被認為是取代傳統石化燃料的最佳選擇；然而由於其本質的低能量密度及間歇性，使其目前仍無法有效地和現有的機械配合。要解決此問題，首先在量的方面得將能量儲存至一個穩定量；此外在質的方面也得盡量地提高其可用功以增進效率。目前的儲存設備，無論是儲存電能、熱能、機械能、氫能都有其瓶頸亟待突破。在這些技術尚未成熟之前，直接將再生能源轉換成這些能量並不恰當。高壓空氣能由於其大小可隨意調整，且容易保存，故是一種較易儲能的方式。前提是如何便宜的將再生能源轉換成高壓氣體能，以及如何地有效率地從高壓氣體能轉換成其他形式能量。
本研究旨在探討以震波的形式將高壓氣體能轉換成電能或機械能的技術。利用震波與壁面交互作用的特性，將能量集中以方便使用及增加效率。雖然震波之理論已相當完備，但是對於上述所提的震波與複雜邊界的交互作用，尤其是移動的壁面(非定常的震波與壁面之間的交互作用)，則尚未有人探討。
本研究以數值模擬方法中的有限體積法(FVM)求解Navier-Stokes方程式，並套用Spalart-Allmaras模型以可壓縮流來探討震波與壁面交互作用的現象。為實現未來利用震波推動磁流體發電的構想，初步模型組成為在一管內配合兩移動檔板於管內進行穩定的震波共振運動，並有系統地進行參數分析，探討各壓力源、溫度、移動壁面重量以及開啟時間的影響程度，主要以質量流率值來作為震波推動磁流體的參考值。
各項變數的調整中，僅於壓差的改變下，其值有顯著的影響。在高壓閥門於最佳的開啟時間中，本研究已找出壓差於2.5、5、10與15atm下的最佳參數值與維持震波穩定合併之時間關係。

關鍵字: 再生能源、高壓空氣能、震波共振、交互作用

關鍵字

再生能源 ； 高壓空氣能 ； 震波共振 ； 交互作用

並列摘要

Abstract
Student ID: M10038027
Title of Thesis: Numerical Studies on Shock Waves Interacted with a Pair of Moving Wall
Total Pages: 90
Name of Institute: National Pingtung University of Science & Technology
Name of Department: Department of Vehicle Engineering
Date of Graduation: July.2013
Name of Student: Ching-Chang Lai

The Contents of Abstract in this Thesis:
Sustainability and the cleanliness of renewable energy is considered to be the best choice on replace traditional fossil fuels; However, the essence of the low energy density and intermittent which still unable to match with machine. For these problems, the first work must be storing energy to stable state. In addition, we have to increase the energy quality to improve efficiency. The current storage device, whether it is to store electrical energy, thermal energy, mechanical energy, hydrogen energy has bottlenecks need to break through. These technologies are not mature before the renewable energy directly converted to these kinds of energy is not appropriate. Due to high-pressure air size can be freely adjusted and easy to save. Therefore it's an easier way for storage. The premise is how to inexpensively use renewable energy sources converted to the high-pressure energy and how to efficiently from the high-pressure energy converted into other forms of energy.
This study aimed to explore the form of high-pressure shock wave energy converted into electrical energy or mechanical energy of technologies. Using shock wave with wall interaction of characteristics to concentrate energy for easy to use and enhance efficiency. Although the shockwave of the theory has been quite complete, but for the above mentioned shockwave interaction with complex boundary. Especially moving wall (with unsteady interaction between shock wave and the wall), just a few people discussed.
In this study, use numerical simulation method of the finite volume method (FVM) to solve Navier-Stokes equations, and applying Spalart-Allmaras model compressible flow to explore the phenomenon of shock wave interaction with the wall. In order to achieve the use of shock waves to promote the idea of MHD power generation, Initial model is composed of two tubes of the movable barrier, in the tube performing stable resonance wave movement, And a systematic parametric analysis to explore the source of pressure, temperature, weight, and pressure release time. Determine the mass flow rate of shock waves pushing magnetic fluid as a reference value. In adjust each variables, only change in Differential pressure, its value has a significant influence.
Open high pressure valve at the best time. This study have identified at 2.5, 5 and 15atm Differential pressure of best parameter values and maintaining stability combined shock waves of the time relationship.

Keywords: Renewable Energy, High-Pressure Energy, Shockwave Resonance, Interaction

並列關鍵字

Renewable Energy ； High-Pressure Energy ； Shockwave Resonance ； Interaction

參考文獻

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